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- PDB-9xwo: Cryo-EM structure of SecM-arrested 70S ribosome (short SecM) -

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Basic information

Entry
Database: PDB / ID: 9xwo
TitleCryo-EM structure of SecM-arrested 70S ribosome (short SecM)
Components
  • (30S ribosomal protein ...) x 20
  • (50S ribosomal protein ...) x 14
  • (Large ribosomal subunit protein ...) x 16
  • 16S rRNA
  • 23S rRNA
  • 5S rRNA
  • A-site tRNA (prolyl-tRNAPro)
  • E-site tRNA (tRNAAla)
  • P-site tRNA (tRNAGly)
  • SecM mRNA
  • Secretion monitor
KeywordsRIBOSOME / SecM / ribosome arrest
Function / homology
Function and homology information


negative regulation of cytoplasmic translational initiation / transcription antitermination factor activity, RNA binding / ornithine decarboxylase inhibitor activity / misfolded RNA binding / Group I intron splicing / RNA folding / transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity ...negative regulation of cytoplasmic translational initiation / transcription antitermination factor activity, RNA binding / ornithine decarboxylase inhibitor activity / misfolded RNA binding / Group I intron splicing / RNA folding / transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / four-way junction DNA binding / negative regulation of cytoplasmic translation / translation regulator activity / DnaA-L2 complex / regulation of mRNA stability / translation repressor activity / negative regulation of translational initiation / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / regulation of DNA-templated transcription elongation / positive regulation of RNA splicing / transcription elongation factor complex / response to reactive oxygen species / cytosolic ribosome assembly / ribosome assembly / assembly of large subunit precursor of preribosome / transcription antitermination / DNA endonuclease activity / translational initiation / regulation of cell growth / DNA-templated transcription termination / response to radiation / maintenance of translational fidelity / mRNA 5'-UTR binding / regulation of translation / large ribosomal subunit / transferase activity / ribosomal small subunit assembly / ribosome biogenesis / ribosome binding / ribosomal small subunit biogenesis / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / periplasmic space / tRNA binding / negative regulation of translation / rRNA binding / structural constituent of ribosome / ribosome / translation / response to antibiotic / negative regulation of DNA-templated transcription / hydrolase activity / mRNA binding / DNA binding / RNA binding / zinc ion binding / membrane / cytoplasm / cytosol
Similarity search - Function
Secretion monitor / Secretion monitor precursor protein (SecM) / Ribosomal protein L1, bacterial-type / Ribosomal protein L1, conserved site / Ribosomal protein L1 signature. / Ribosomal protein L1 / Ribosomal protein L1, 3-layer alpha/beta-sandwich / Ribosomal protein L1-like / Ribosomal protein L1/ribosomal biogenesis protein / Ribosomal protein L1p/L10e family ...Secretion monitor / Secretion monitor precursor protein (SecM) / Ribosomal protein L1, bacterial-type / Ribosomal protein L1, conserved site / Ribosomal protein L1 signature. / Ribosomal protein L1 / Ribosomal protein L1, 3-layer alpha/beta-sandwich / Ribosomal protein L1-like / Ribosomal protein L1/ribosomal biogenesis protein / Ribosomal protein L1p/L10e family / Ribosomal protein S21, conserved site / Ribosomal protein S21 signature. / Ribosomal protein L25, short-form / Ribosomal protein S14, bacterial/plastid / Ribosomal protein L31 type A / Ribosomal protein S21 superfamily / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein S21 / Ribosomal protein L31 signature. / Ribosomal protein L31 / Ribosomal protein L31 superfamily / Ribosomal protein L31 / Ribosomal protein S21 / Ribosomal protein L9 signature. / Ribosomal protein L16 signature 1. / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / Ribosomal protein L9, bacteria/chloroplast / Ribosomal protein L9, C-terminal / Ribosomal protein L9, C-terminal domain / Ribosomal protein L21, conserved site / : / Ribosomal protein L21 signature. / Ribosomal protein L9, C-terminal domain superfamily / Ribosomal protein L16 signature 2. / Ribosomal protein L16, conserved site / Ribosomal protein L17 signature. / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L36 signature. / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / Ribosomal protein L25/Gln-tRNA synthetase, anti-codon-binding domain superfamily / : / Ribosomal protein L28/L24 superfamily / Ribosomal protein L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L32p, bacterial type / Ribosomal protein L35, conserved site / Ribosomal protein L35 signature. / Ribosomal protein L9 / Ribosomal protein L9, N-terminal domain superfamily / Ribosomal protein L9, N-terminal / Ribosomal protein L9, N-terminal domain / Ribosomal protein L28 / Ribosomal protein L35, non-mitochondrial / Ribosomal protein L18, bacterial-type / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S3, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S19, bacterial-type / : / Ribosomal protein L6, bacterial-type / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S11, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S4, bacterial-type / Ribosomal protein L5, bacterial-type / Ribosomal protein S5, bacterial-type / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / 30S ribosomal protein S17 / : / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein L36 / Ribosomal protein L36 superfamily / Ribosomal protein L36 / Ribosomal protein L20 signature. / Ribosomal protein L34, conserved site / Ribosomal protein L34 signature. / Ribosomal protein L14P, bacterial-type / Ribosomal protein L27, conserved site / Ribosomal protein L27 signature. / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein L35 / Ribosomal protein L35 superfamily / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein L35 / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein L33 / Ribosomal protein L18 / Ribosomal L18 of archaea, bacteria, mitoch. and chloroplast / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein L33 / Ribosomal L28 family
Similarity search - Domain/homology
: / PROLINE / SPERMIDINE / : / : / : / : / RNA / RNA (> 10) / RNA (> 100) ...: / PROLINE / SPERMIDINE / : / : / : / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein uL1 / Secretion monitor / Small ribosomal subunit protein bS6 / Small ribosomal subunit protein uS7 / Large ribosomal subunit protein uL15 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL27 / Large ribosomal subunit protein bL28 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein bL31 / Large ribosomal subunit protein bL32 / Large ribosomal subunit protein bL33 / Large ribosomal subunit protein bL34 / Large ribosomal subunit protein bL35 / Large ribosomal subunit protein bL36A / Large ribosomal subunit protein bL9 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein bS16 / Small ribosomal subunit protein bS18 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein bS20 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein uS8 / Small ribosomal subunit protein uS9 / Large ribosomal subunit protein uL13 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL16 / Large ribosomal subunit protein uL23 / Small ribosomal subunit protein uS15 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein bL21 / Large ribosomal subunit protein uL30 / Large ribosomal subunit protein uL6 / Small ribosomal subunit protein uS14 / Small ribosomal subunit protein uS17 / Large ribosomal subunit protein uL18 / Large ribosomal subunit protein uL2 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL24 / Large ribosomal subunit protein uL4 / Large ribosomal subunit protein uL22 / Large ribosomal subunit protein uL5 / Small ribosomal subunit protein bS21 / Large ribosomal subunit protein bL25
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.89 Å
AuthorsIso, K. / Ando, Y. / Taguchi, H. / Nureki, O. / Chadani, Y. / Itoh, Y.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: Nat Commun / Year: 2026
Title: Structural insights into YheS-mediated release of SecM-arrested ribosome.
Authors: Kaishi Iso / Toma Ikeda / Kohei Yamasaki / Yushin Ando / Fumiya K Sano / Tadaomi Furuta / Hideki Taguchi / Osamu Nureki / Yuhei Chadani / Yuzuru Itoh /
Abstract: ATP-binding cassette subfamily F (ABCF) proteins interact with the ribosome to resolve translation defects near the peptidyl transferase center (PTC). In Escherichia coli, four ABCF proteins (EttA, ...ATP-binding cassette subfamily F (ABCF) proteins interact with the ribosome to resolve translation defects near the peptidyl transferase center (PTC). In Escherichia coli, four ABCF proteins (EttA, Uup, YbiT, and YheS) selectively promote translation of distinct problematic nascent peptide sequences, but their molecular mechanisms remain unclear. Here, we present a 2.8 Å cryo-EM structure of the ribosome in complex with an ATPase-deficient mutant of YheS and investigate how it releases ribosomes arrested by the SecM nascent chain. YheS binds to the ribosomal E-site via the L1 stalk, and its P-site tRNA-interaction motif (PtIM) extends toward the PTC, displacing the CCA end of the P-site tRNA. Notably, the cryo-EM density corresponding to the SecM nascent chain within the exit tunnel is largely lost upon YheS binding. These observations suggest that YheS relieves peptide sequence-dependent stalling by perturbing nascent chain-tunnel interactions through P-site tRNA relocation. Steered molecular dynamics simulations provide qualitative support for this model. Together, our findings provide mechanistic insight into a mode of arrest release distinct from the translocon-mediated release mechanism.
History
DepositionNov 28, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 17, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: 16S rRNA
B: 30S ribosomal protein S2
C: 30S ribosomal protein S3
D: 30S ribosomal protein S4
E: 30S ribosomal protein S5
F: 30S ribosomal protein S6, fully modified isoform
G: 30S ribosomal protein S7
H: 30S ribosomal protein S8
I: 30S ribosomal protein S9
J: 30S ribosomal protein S10
K: 30S ribosomal protein S11
L: 30S ribosomal protein S12
M: 30S ribosomal protein S13
N: 30S ribosomal protein S14
O: 30S ribosomal protein S15
P: 30S ribosomal protein S16
Q: 30S ribosomal protein S17
R: 30S ribosomal protein S18
S: 30S ribosomal protein S19
T: 30S ribosomal protein S20
U: 30S ribosomal protein S21
a: 23S rRNA
b: 5S rRNA
7: Large ribosomal subunit protein uL1
c: Large ribosomal subunit protein uL2
d: 50S ribosomal protein L3
e: 50S ribosomal protein L4
f: Large ribosomal subunit protein uL5
g: Large ribosomal subunit protein uL6
h: 50S ribosomal protein L9
i: 50S ribosomal protein L13
j: 50S ribosomal protein L14
k: 50S ribosomal protein L15
l: 50S ribosomal protein L16
m: Large ribosomal subunit protein bL17
n: Large ribosomal subunit protein uL18
o: Large ribosomal subunit protein bL19
p: Large ribosomal subunit protein bL20
q: 50S ribosomal protein L21
r: 50S ribosomal protein L22
s: Large ribosomal subunit protein uL23
t: 50S ribosomal protein L24
u: 50S ribosomal protein L25
v: Large ribosomal subunit protein bL27
w: Large ribosomal subunit protein bL28
x: Large ribosomal subunit protein uL29
y: Large ribosomal subunit protein uL30
4: 50S ribosomal protein L31
z: Large ribosomal subunit protein bL32
0: Large ribosomal subunit protein bL33
1: 50S ribosomal protein L34
2: Large ribosomal subunit protein bL35
3: 50S ribosomal protein L36
X: SecM mRNA
Y: A-site tRNA (prolyl-tRNAPro)
Z: P-site tRNA (tRNAGly)
5: E-site tRNA (tRNAAla)
6: Secretion monitor
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,471,257460
Polymers2,459,11458
Non-polymers12,143402
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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RNA chain , 7 types, 7 molecules AabXYZ5

#1: RNA chain 16S rRNA


Mass: 499873.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1758835854
#22: RNA chain 23S rRNA


Mass: 941811.562 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli)
#23: RNA chain 5S rRNA


Mass: 38483.926 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1832586162
#54: RNA chain SecM mRNA


Mass: 201796.625 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Escherichia coli (E. coli)
#55: RNA chain A-site tRNA (prolyl-tRNAPro)


Mass: 24907.848 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1845258627
#56: RNA chain P-site tRNA (tRNAGly)


Mass: 24529.674 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1845826323
#57: RNA chain E-site tRNA (tRNAAla)


Mass: 24581.643 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1845258627

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30S ribosomal protein ... , 20 types, 20 molecules BCDEFGHIJKLMNOPQRSTU

#2: Protein 30S ribosomal protein S2 / Small ribosomal subunit protein uS2


Mass: 26781.670 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7V0
#3: Protein 30S ribosomal protein S3 / Small ribosomal subunit protein uS3


Mass: 26031.316 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7V3
#4: Protein 30S ribosomal protein S4 / Small ribosomal subunit protein uS4


Mass: 23514.199 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7V8
#5: Protein 30S ribosomal protein S5 / Small ribosomal subunit protein uS5


Mass: 17629.398 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7W1
#6: Protein 30S ribosomal protein S6, fully modified isoform


Mass: 15727.512 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P02358
#7: Protein 30S ribosomal protein S7 / Small ribosomal subunit protein uS7


Mass: 20055.156 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P02359
#8: Protein 30S ribosomal protein S8 / Small ribosomal subunit protein uS8


Mass: 14146.557 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7W7
#9: Protein 30S ribosomal protein S9 / Small ribosomal subunit protein uS9


Mass: 14886.270 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7X3
#10: Protein 30S ribosomal protein S10 / Small ribosomal subunit protein uS10 / Transcription termination/antitermination protein NusE


Mass: 11755.597 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7R5
#11: Protein 30S ribosomal protein S11 / Small ribosomal subunit protein uS11


Mass: 13871.959 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7R9
#12: Protein 30S ribosomal protein S12 / Small ribosomal subunit protein uS12


Mass: 13814.249 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7S3
#13: Protein 30S ribosomal protein S13 / Small ribosomal subunit protein uS13


Mass: 13128.467 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7S9
#14: Protein 30S ribosomal protein S14 / Small ribosomal subunit protein uS14


Mass: 11606.560 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG59
#15: Protein 30S ribosomal protein S15 / Small ribosomal subunit protein uS15


Mass: 10290.816 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0ADZ4
#16: Protein 30S ribosomal protein S16 / Small ribosomal subunit protein bS16


Mass: 9207.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7T3
#17: Protein 30S ribosomal protein S17 / Small ribosomal subunit protein uS17


Mass: 9724.491 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG63
#18: Protein 30S ribosomal protein S18 / Small ribosomal subunit protein bS18


Mass: 9005.472 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7T7
#19: Protein 30S ribosomal protein S19 / Small ribosomal subunit protein uS19


Mass: 10455.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7U3
#20: Protein 30S ribosomal protein S20 / Small ribosomal subunit protein bS20


Mass: 9708.464 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7U7
#21: Protein 30S ribosomal protein S21 / Small ribosomal subunit protein bS21


Mass: 8524.039 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P68679

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Large ribosomal subunit protein ... , 16 types, 16 molecules 7cfgmnopsvwxyz02

#24: Protein Large ribosomal subunit protein uL1 / 50S ribosomal protein L1


Mass: 24765.660 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A7ZUJ7
#25: Protein Large ribosomal subunit protein uL2 / 50S ribosomal protein L2


Mass: 29923.619 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P60422
#28: Protein Large ribosomal subunit protein uL5 / 50S ribosomal protein L5


Mass: 20333.611 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P62399
#29: Protein Large ribosomal subunit protein uL6 / 50S ribosomal protein L6


Mass: 18932.791 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG55
#35: Protein Large ribosomal subunit protein bL17 / 50S ribosomal protein L17


Mass: 14393.657 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG44
#36: Protein Large ribosomal subunit protein uL18 / 50S ribosomal protein L18


Mass: 12794.668 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0C018
#37: Protein Large ribosomal subunit protein bL19 / 50S ribosomal protein L19


Mass: 13159.278 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7K6
#38: Protein Large ribosomal subunit protein bL20 / 50S ribosomal protein L20


Mass: 13528.024 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7L3
#41: Protein Large ribosomal subunit protein uL23 / 50S ribosomal protein L23


Mass: 11222.160 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0ADZ0
#44: Protein Large ribosomal subunit protein bL27 / 50S ribosomal protein L27


Mass: 9146.540 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7L8
#45: Protein Large ribosomal subunit protein bL28 / 50S ribosomal protein L28


Mass: 9027.551 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7M2
#46: Protein Large ribosomal subunit protein uL29 / 50S ribosomal protein L29


Mass: 7286.464 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7M6
#47: Protein Large ribosomal subunit protein uL30 / 50S ribosomal protein L30


Mass: 6554.820 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG51
#49: Protein Large ribosomal subunit protein bL32 / 50S ribosomal protein L32


Mass: 6463.445 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7N4
#50: Protein Large ribosomal subunit protein bL33 / 50S ribosomal protein L33


Mass: 6388.631 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7N9
#52: Protein Large ribosomal subunit protein bL35 / 50S ribosomal protein L35 / Ribosomal protein A


Mass: 7313.032 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7Q1

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50S ribosomal protein ... , 14 types, 14 molecules dehijklqrtu413

#26: Protein 50S ribosomal protein L3 / Large ribosomal subunit protein uL3


Mass: 22291.562 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P60438
#27: Protein 50S ribosomal protein L4 / Large ribosomal subunit protein uL4


Mass: 22121.566 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P60723
#30: Protein 50S ribosomal protein L9 / Large ribosomal subunit protein bL9


Mass: 15789.020 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7R1
#31: Protein 50S ribosomal protein L13 / Large ribosomal subunit protein uL13


Mass: 16050.606 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AA10
#32: Protein 50S ribosomal protein L14 / Large ribosomal subunit protein uL14


Mass: 13565.067 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0ADY3
#33: Protein 50S ribosomal protein L15 / Large ribosomal subunit protein uL15


Mass: 15008.471 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P02413
#34: Protein 50S ribosomal protein L16 / Large ribosomal subunit protein uL16


Mass: 15343.327 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0ADY7
#39: Protein 50S ribosomal protein L21 / Large ribosomal subunit protein bL21


Mass: 11586.374 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0AG48
#40: Protein 50S ribosomal protein L22 / Large ribosomal subunit protein uL22


Mass: 12253.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P61175
#42: Protein 50S ribosomal protein L24 / Large ribosomal subunit protein uL24


Mass: 11339.250 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P60624
#43: Protein 50S ribosomal protein L25 / Large ribosomal subunit protein bL25


Mass: 10713.465 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P68919
#48: Protein 50S ribosomal protein L31 / Large ribosomal subunit protein bL31-A


Mass: 7887.117 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7M9
#51: Protein/peptide 50S ribosomal protein L34 / Large ribosomal subunit protein bL34


Mass: 5397.463 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7P5
#53: Protein/peptide 50S ribosomal protein L36 / Large ribosomal subunit protein bL36-A / Ribosomal protein B


Mass: 4377.390 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P0A7Q6

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Protein , 1 types, 1 molecules 6

#58: Protein Secretion monitor


Mass: 18305.811 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: secM, EC55989_0093 / Production host: Escherichia coli (E. coli) / References: UniProt: B7LFW7

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Non-polymers , 5 types, 402 molecules

#59: Chemical...
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 116 / Source method: obtained synthetically / Formula: K
#60: Chemical...
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 279 / Source method: obtained synthetically / Formula: Mg
#61: Chemical
ChemComp-SPD / SPERMIDINE / N-(2-AMINO-PROPYL)-1,4-DIAMINOBUTANE / PA(34)


Mass: 145.246 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C7H19N3
#62: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn
#63: Chemical ChemComp-PRO / PROLINE


Type: L-peptide linking / Mass: 115.130 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C5H9NO2 / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: 70S ribosome arrested by SecM / Type: RIBOSOME / Entity ID: #1-#58 / Source: NATURAL
Source (natural)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.3
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 30 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 18200

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
7UCSF Chimeramodel fitting
8Cootmodel fitting
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
14PHENIX1.20.1_4487model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1770974
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.89 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 26202 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeSource nameTypeInitial refinement model-ID
19VVI

9vvi

19VVIPDBexperimental model
28QOA

8qoa

18QOAPDBexperimental model2
RefinementHighest resolution: 2.89 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)

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