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- PDB-6pj6: High resolution cryo-EM structure of E.coli 50S -

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Basic information

Entry
Database: PDB / ID: 6pj6
TitleHigh resolution cryo-EM structure of E.coli 50S
Components
  • (50S ribosomal protein ...) x 29
  • 23S rRNA23S ribosomal RNA
  • 5S rRNA5S ribosomal RNA
KeywordsRIBOSOME
Function / homology
Function and homology information


ribosomal large subunit assembly / large ribosomal subunit / 5S rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / transferase activity / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome ...ribosomal large subunit assembly / large ribosomal subunit / 5S rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / transferase activity / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / cytosol / cytoplasm
Similarity search - Function
Ribosomal protein L25, short-form / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 1. / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / Ribosomal protein L16, conserved site / Ribosomal protein L16 signature 2. / Ribosomal protein L9 signature. / Ribosomal protein L9, bacteria/chloroplast ...Ribosomal protein L25, short-form / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 1. / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / Ribosomal protein L16, conserved site / Ribosomal protein L16 signature 2. / Ribosomal protein L9 signature. / Ribosomal protein L9, bacteria/chloroplast / Ribosomal protein L9, C-terminal / Ribosomal protein L9, C-terminal domain / Ribosomal protein L9, C-terminal domain superfamily / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L28/L24 superfamily / Ribosomal protein L36 signature. / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / Ribosomal protein L32p, bacterial type / Ribosomal protein L25/Gln-tRNA synthetase, anti-codon-binding domain superfamily / Ribosomal protein L9, N-terminal domain superfamily / Ribosomal protein L9 / Ribosomal protein L9, N-terminal / Ribosomal protein L9, N-terminal domain / Ribosomal protein L28 / Ribosomal protein L35, conserved site / Ribosomal protein L35 signature. / Ribosomal protein L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L35, non-mitochondrial / Ribosomal protein L5, bacterial-type / Ribosomal protein L6, bacterial-type / Ribosomal protein L18, bacterial-type / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / Ribosomal protein L36 / Ribosomal protein L36 superfamily / Ribosomal protein L36 / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein L20 signature. / Ribosomal protein L27, conserved site / Ribosomal protein L27 signature. / Ribosomal protein L14P, bacterial-type / Ribosomal protein L34, conserved site / Ribosomal protein L34 signature. / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein L35 / Ribosomal protein L35 superfamily / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein L35 / Ribosomal L28 family / Ribosomal protein L33 / Ribosomal protein L33 / Ribosomal protein L28/L24 / Ribosomal protein L33 superfamily / Ribosomal protein L30, bacterial-type / Ribosomal protein L16 / Ribosomal protein L18 / Ribosomal L18 of archaea, bacteria, mitoch. and chloroplast / L28p-like / Ribosomal protein L20 / Ribosomal protein L20 / Ribosomal protein L20, C-terminal / Ribosomal protein L21 / Ribosomal protein L27 / Ribosomal L27 protein / Ribosomal protein L19 / Ribosomal protein L19 superfamily / Ribosomal protein L19 / Ribosomal proteins 50S L24/mitochondrial 39S L24 / Ribosomal protein L21-like / L21-like superfamily / Ribosomal prokaryotic L21 protein / Ribosomal L32p protein family / Ribosomal protein L24 / Ribosomal protein L32p / Ribosomal protein L34 / Ribosomal protein L34 / Ribosomal protein L13, bacterial-type / Ribosomal protein L23/L25, conserved site / Ribosomal protein L3, bacterial/organelle-type / Ribosomal protein L15, bacterial-type / 50S ribosomal protein uL4 / Ribosomal protein L23 signature. / Ribosomal protein L30, conserved site / Ribosomal protein L5, conserved site / Ribosomal protein L29, conserved site / Ribosomal protein L30 signature. / Ribosomal protein L5, N-terminal / Ribosomal protein L5 signature. / Ribosomal protein L15, conserved site / Ribosomal protein L5, C-terminal / Ribosomal protein L5 / Ribosomal protein L5 domain superfamily / Ribosomal protein L2, conserved site / Ribosomal protein L2 signature. / Ribosomal protein L10e/L16 / Ribosomal protein L10e/L16 superfamily / Ribosomal protein L29 signature. / Ribosomal protein L5
Similarity search - Domain/homology
: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein uL15 / 50S ribosomal protein L27 / 50S ribosomal protein L6 / : / : ...: / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein uL15 / 50S ribosomal protein L27 / 50S ribosomal protein L6 / : / : / Large ribosomal subunit protein bL36 / Large ribosomal subunit protein uL2 / 50S ribosomal protein L33 / Large ribosomal subunit protein bL34 / 50S ribosomal protein L16 / Large ribosomal subunit protein bL25 / 50S ribosomal protein L14 / 50S ribosomal protein L4 / 50S ribosomal protein L22 / 50S ribosomal protein L18 / 50S ribosomal protein L21 / 50S ribosomal protein L13 / 50S ribosomal protein L9 / Large ribosomal subunit protein uL29 / 50S ribosomal protein L5 / 50S ribosomal protein L23 / 50S ribosomal protein L19 / 50S ribosomal protein L30 / 50S ribosomal protein L35 / Large ribosomal subunit protein uL3 / 50S ribosomal protein L28 / 50S ribosomal protein L24 / Large ribosomal subunit protein bL32 / 50S ribosomal protein L20
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.2 Å
AuthorsStojkovic, V. / Myasnikov, A. / Frost, A. / Fujimori, D.G.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI137270 United States
National Institutes of Health/National Center for Research Resources (NIH/NCRR)1R01GM127673-01 United States
National Institutes of Health/National Center for Research Resources (NIH/NCRR)5P50GM082545-12 United States
CitationJournal: Nucleic Acids Res / Year: 2020
Title: Assessment of the nucleotide modifications in the high-resolution cryo-electron microscopy structure of the Escherichia coli 50S subunit.
Authors: Vanja Stojković / Alexander G Myasnikov / Iris D Young / Adam Frost / James S Fraser / Danica Galonić Fujimori /
Abstract: Post-transcriptional ribosomal RNA (rRNA) modifications are present in all organisms, but their exact functional roles and positions are yet to be fully characterized. Modified nucleotides have been ...Post-transcriptional ribosomal RNA (rRNA) modifications are present in all organisms, but their exact functional roles and positions are yet to be fully characterized. Modified nucleotides have been implicated in the stabilization of RNA structure and regulation of ribosome biogenesis and protein synthesis. In some instances, rRNA modifications can confer antibiotic resistance. High-resolution ribosome structures are thus necessary for precise determination of modified nucleotides' positions, a task that has previously been accomplished by X-ray crystallography. Here, we present a cryo-electron microscopy (cryo-EM) structure of the Escherichia coli 50S subunit at an average resolution of 2.2 Å as an additional approach for mapping modification sites. Our structure confirms known modifications present in 23S rRNA and additionally allows for localization of Mg2+ ions and their coordinated water molecules. Using our cryo-EM structure as a testbed, we developed a program for assessment of cryo-EM map quality. This program can be easily used on any RNA-containing cryo-EM structure, and an associated Coot plugin allows for visualization of validated modifications, making it highly accessible.
History
DepositionJun 27, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 22, 2020Provider: repository / Type: Initial release
Revision 1.1Feb 12, 2020Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name
Revision 1.2Mar 18, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 2.0Nov 15, 2023Group: Atomic model / Data collection ...Atomic model / Data collection / Database references / Derived calculations
Category: atom_site / chem_comp_atom ...atom_site / chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_conn_angle / struct_conn / struct_conn_type
Item: _atom_site.auth_atom_id / _atom_site.label_atom_id ..._atom_site.auth_atom_id / _atom_site.label_atom_id / _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_conn_angle.ptnr1_auth_asym_id / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_asym_id / _pdbx_struct_conn_angle.ptnr2_auth_comp_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr2_label_atom_id / _pdbx_struct_conn_angle.ptnr2_label_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.conn_type_id / _struct_conn.id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_conn_type.id

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Structure visualization

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Assembly

Deposited unit
I: 23S rRNA
J: 5S rRNA
K: 50S ribosomal protein L2
L: 50S ribosomal protein L3
M: 50S ribosomal protein L4
N: 50S ribosomal protein L5
O: 50S ribosomal protein L6
P: 50S ribosomal protein L9
Q: 50S ribosomal protein L11
R: 50S ribosomal protein L13
S: 50S ribosomal protein L14
T: 50S ribosomal protein L15
U: 50S ribosomal protein L16
V: 50S ribosomal protein L17
W: 50S ribosomal protein L18
X: 50S ribosomal protein L19
Y: 50S ribosomal protein L20
Z: 50S ribosomal protein L21
a: 50S ribosomal protein L22
b: 50S ribosomal protein L23
c: 50S ribosomal protein L24
d: 50S ribosomal protein L25
e: 50S ribosomal protein L27
f: 50S ribosomal protein L28
g: 50S ribosomal protein L29
h: 50S ribosomal protein L30
i: 50S ribosomal protein L32
j: 50S ribosomal protein L33
k: 50S ribosomal protein L34
l: 50S ribosomal protein L35
m: 50S ribosomal protein L36
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,356,032218
Polymers1,351,44831
Non-polymers4,585187
Water70,2043897
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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RNA chain , 2 types, 2 molecules IJ

#1: RNA chain 23S rRNA / 23S ribosomal RNA


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


Mass: 38177.762 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: GenBank: 1266940032

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50S ribosomal protein ... , 29 types, 29 molecules KLMNOPQRSTUVWXYZabcdefghijklm

#3: Protein 50S ribosomal protein L2 /


Mass: 29663.244 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A1X3I1Y9
#4: Protein 50S ribosomal protein L3 / / Large ribosomal subunit protein uL3


Mass: 22277.535 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: P60438
#5: Protein 50S ribosomal protein L4 /


Mass: 22121.566 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7Z9F6
#6: Protein 50S ribosomal protein L5 /


Mass: 20073.234 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: H4KMS0
#7: Protein 50S ribosomal protein L6 /


Mass: 18801.598 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: A0A080FKA9
#8: Protein 50S ribosomal protein L9 /


Mass: 15789.020 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7ZI15
#9: Protein 50S ribosomal protein L11 /


Mass: 14020.303 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A0A8UM35
#10: Protein 50S ribosomal protein L13 /


Mass: 16050.606 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7ZET0
#11: Protein 50S ribosomal protein L14 /


Mass: 13451.910 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7Y3D0
#12: Protein 50S ribosomal protein L15 /


Mass: 15008.471 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A037Y8L6
#13: Protein 50S ribosomal protein L16 /


Mass: 15327.261 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D6IEL1
#14: Protein 50S ribosomal protein L17 /


Mass: 13721.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A0A8UJP9
#15: Protein 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: D7Z9H1
#16: Protein 50S ribosomal protein L19 /


Mass: 13028.082 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: L2UTN8
#17: Protein 50S ribosomal protein L20 /


Mass: 13396.828 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: W1HFV2
#18: Protein 50S ribosomal protein L21 /


Mass: 11586.374 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7ZEN7
#19: Protein 50S ribosomal protein L22 /


Mass: 12253.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7Z9G0
#20: Protein 50S ribosomal protein L23 /


Mass: 10546.472 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: J7RVN9
#21: Protein 50S ribosomal protein L24 /


Mass: 11078.874 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: U9Y1I5
#22: Protein 50S ribosomal protein L25 /


Mass: 10713.465 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: D7XH79
#23: Protein 50S ribosomal protein L27 /


Mass: 8174.394 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: A0A074HTA6
#24: Protein 50S ribosomal protein L28 /


Mass: 8896.354 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: T9AVR0
#25: Protein 50S ribosomal protein L29 /


Mass: 7155.267 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: D8E8E5
#26: Protein 50S ribosomal protein L30 /


Mass: 6423.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: L2VFR0
#27: Protein 50S ribosomal protein L32 /


Mass: 6332.249 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: V0ZMP5
#28: Protein/peptide 50S ribosomal protein L33 /


Mass: 5814.842 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: A0A1X3LDF5
#29: Protein/peptide 50S ribosomal protein L34 /


Mass: 5397.463 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: B7MGC4
#30: Protein 50S ribosomal protein L35 /


Mass: 7181.835 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli / References: UniProt: L4VIS3
#31: Protein/peptide 50S ribosomal protein L36 /


Mass: 4377.390 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A0E2L017

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Non-polymers , 4 types, 4084 molecules

#32: Chemical...
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 185 / Source method: obtained synthetically / Formula: Mg
#33: Chemical ChemComp-NA / SODIUM ION


Mass: 22.990 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Na
#34: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#35: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 3897 / Source method: isolated from a natural source / Formula: H2O

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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: Escherichia coli 50S subunit / Type: RIBOSOME / Entity ID: #1-#31 / Source: NATURAL
Source (natural)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5 / Details: Buffer A
Buffer componentConc.: 10 mM / Name: TRIS / Formula: TRIS
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: 50S ribosomal subunit was purified from E. coli MRE600 using modified version of previously published protocol (Mehta et al. 2012)
Specimen supportDetails: easyGlow settings / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 10 K
Details: Blot Force 5 Blot Time 10sec Hum 95% Temperature 10C Waiting time 1 min

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 59000 X / Calibrated magnification: 60827 X / Nominal defocus max: 1200 nm / Nominal defocus min: 300 nm / Calibrated defocus min: 500 nm / Calibrated defocus max: 1500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 130 K / Temperature (min): 86 K / Residual tilt: 10 mradians
Image recordingAverage exposure time: 8 sec. / Electron dose: 80 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 1889
Image scansSampling size: 5 µm / Width: 3838 / Height: 3710 / Movie frames/image: 80 / Used frames/image: 0-80

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Processing

EM software
IDNameCategory
2SerialEMimage acquisition
4CTFFINDCTF correction
10cryoSPARCinitial Euler assignment
11cisTEMfinal Euler assignment
13cisTEM3D reconstruction
CTF correctionType: NONE
Particle selectionNum. of particles selected: 193000
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 141549 / Algorithm: FOURIER SPACE / Symmetry type: POINT

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