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- PDB-9k10: EF-G2 bound 50S ribosome subunit complex of M. smegmatis -

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Entry
Database: PDB / ID: 9k10
TitleEF-G2 bound 50S ribosome subunit complex of M. smegmatis
Components
  • (50S ribosomal protein ...) x 31
  • 23S ribosomal RNA
  • 5S ribosomal RNA
  • Large ribosomal subunit protein uL24
  • Translation elongation factor EF-G
KeywordsRIBOSOME / Mycobacterium 50S ribosomal subunit / elongation factor G2 / stationary phase
Function / homology
Function and homology information


ribosome disassembly / translation elongation factor activity / large ribosomal subunit / transferase activity / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding ...ribosome disassembly / translation elongation factor activity / large ribosomal subunit / transferase activity / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / GTPase activity / mRNA binding / GTP binding / metal ion binding / cytoplasm
Similarity search - Function
: / Elongation factor G, domain III / EFG, domain V / Elongation Factor G, domain II / Elongation Factor G, domain III / Ribosomal protein L10, eubacterial, conserved site / Ribosomal protein L10 signature. / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV ...: / Elongation factor G, domain III / EFG, domain V / Elongation Factor G, domain II / Elongation Factor G, domain III / Ribosomal protein L10, eubacterial, conserved site / Ribosomal protein L10 signature. / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV / Elongation factor G C-terminus / Ribosomal protein L25, long-form / Ribosomal protein L25, beta domain / Ribosomal protein L25, C-terminal / Ribosomal protein TL5, C-terminal domain / Ribosomal protein L10 / Elongation factor EFG, domain V-like / Elongation factor G C-terminus / EF-G domain III/V-like / : / : / Translation elongation factor EFTu-like, domain 2 / Ribosomal protein L11, bacterial-type / Elongation factor Tu domain 2 / Ribosomal protein L31 type A / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain / Translational (tr)-type guanine nucleotide-binding (G) domain profile. / Ribosomal protein L31 signature. / Ribosomal protein L31 / Ribosomal protein L31 superfamily / Ribosomal protein L31 / Ribosomal protein L11, conserved site / Ribosomal protein L11 signature. / Ribosomal protein L10-like domain superfamily / : / Ribosomal protein L10P / Ribosomal protein L10 / Ribosomal protein L16 signature 1. / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 2. / Ribosomal protein L16, conserved site / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / : / 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 protein L11, N-terminal / Ribosomal protein L11, N-terminal domain / Ribosomal protein L11/L12 / Ribosomal protein L11, C-terminal / Ribosomal protein L11, C-terminal domain superfamily / Ribosomal protein L11/L12, N-terminal domain superfamily / Ribosomal protein L11/L12 / Ribosomal protein L11, RNA binding domain / Ribosomal protein L17 signature. / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L36 signature. / Ribosomal protein L28/L24 superfamily / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / 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 L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L35, conserved site / Ribosomal protein L35 signature. / Ribosomal protein L28 / Ribosomal protein L35, non-mitochondrial / : / Ribosomal protein L18, bacterial-type / : / Ribosomal protein L5, bacterial-type / Ribosomal protein L6, bacterial-type / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein L36 / Ribosomal protein L36 superfamily / Ribosomal protein L36 / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / Ribosomal protein L27, conserved site / Ribosomal protein L27 signature. / Ribosomal protein L20 signature. / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein L14P, bacterial-type / Ribosomal protein L34, conserved site / Ribosomal protein L34 signature. / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein L35 / Ribosomal protein L35 superfamily / Ribosomal protein L35 / Ribosomal protein L33 / Ribosomal protein L33
Similarity search - Domain/homology
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein bL33A / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein uL10 / Large ribosomal subunit protein uL3 ...PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Large ribosomal subunit protein bL33A / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein uL10 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL4 / Large ribosomal subunit protein uL23 / Large ribosomal subunit protein uL2 / Large ribosomal subunit protein uL22 / Large ribosomal subunit protein uL16 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL24 / Large ribosomal subunit protein uL5 / Large ribosomal subunit protein uL6 / Large ribosomal subunit protein uL18 / Large ribosomal subunit protein uL30 / Large ribosomal subunit protein uL15 / Large ribosomal subunit protein bL36 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein uL13 / Uncharacterized protein / Large ribosomal subunit protein bL28 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL35 / Large ribosomal subunit protein bL27 / Large ribosomal subunit protein bL21 / Large ribosomal subunit protein bL31 / Large ribosomal subunit protein bL25 / Large ribosomal subunit protein bL32 / Elongation factor G-like protein / Large ribosomal subunit protein bL9 / Large ribosomal subunit protein bL34
Similarity search - Component
Biological speciesMycolicibacterium smegmatis MC2 155 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsSengupta, J. / Baid, P.
Funding support India, 3items
OrganizationGrant numberCountry
Science and Engineering Research Board (SERB)SPF/2021/000141 India
Science and Engineering Research Board (SERB)CRG/2019/001788 India
Council of Scientific & Industrial Research (CSIR)MLP-139 India
CitationJournal: FEBS J / Year: 2025
Title: Cryo-EM structural analyses reveal a unique role for elongation factor G2 (EF-G2) in Mycobacteria.
Authors: Priya Baid / Jayati Sengupta /
Abstract: The gene-encoding translation elongation factor G (EF-G) has undergone gene duplication across various bacterial species including Mycobacteria, and in mammalian mitochondria, leading to the ...The gene-encoding translation elongation factor G (EF-G) has undergone gene duplication across various bacterial species including Mycobacteria, and in mammalian mitochondria, leading to the emergence of the paralogue elongation factor G2 (EF-G2). Our study reveals that mycobacterial EF-G2, unlike EF-G1, neither participates in ribosome-recycling nor significantly contributes to overall translation, suggesting that it plays an alternative role in Mycobacteria. Remarkably, our investigation found a significant overexpression of mycobacterial EF-G2 during the stationary growth phase. Moreover, EF-G2 lacks ribosome-dependent GTPase activity, an observation consistent with previous reports. Cryo-EM analysis of the M. smegmatis 70S ribosome purified from the nutrient-starved (stationary) phase and complexed with EF-G2 unveiled the structural basis for its inability to hydrolyse GTP in a ribosome-dependent manner. Furthermore, we report an unprecedented binding mode of two EF-G2 copies on the 50S ribosomal subunit that impedes subunit association, thereby preventing the formation of active 70S ribosomes. Thus, instead of performing canonical functions, mycobacterial EF-G2 acts as a translation repressor during nutrient starvation. Altogether, our findings shed light on the multifaceted mechanisms by which EF-G2 modulates protein synthesis under nutrient-limited conditions, providing insights into adaptive strategies employed by Mycobacteria to survive in hostile environments.
History
DepositionOct 16, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 9, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
3: 50S ribosomal protein bL37
5: Translation elongation factor EF-G
6: Translation elongation factor EF-G
B: 5S ribosomal RNA
C: 50S ribosomal protein L2
D: 50S ribosomal protein L3
E: 50S ribosomal protein L4
F: 50S ribosomal protein L5
G: 50S ribosomal protein L6
H: 50S ribosomal protein L9
I: 50S ribosomal protein L10
J: 50S ribosomal protein L11
K: 50S ribosomal protein L13
L: 50S ribosomal protein L14
M: 50S ribosomal protein L15
N: 50S ribosomal protein L16
O: 50S ribosomal protein L17
P: 50S ribosomal protein L18
Q: 50S ribosomal protein L19
R: 50S ribosomal protein L20
S: 50S ribosomal protein L21
T: 50S ribosomal protein L22
U: 50S ribosomal protein L23
V: Large ribosomal subunit protein uL24
W: 50S ribosomal protein L25
X: 50S ribosomal protein L27
Y: 50S ribosomal protein L28
Z: 50S ribosomal protein L29
a: 50S ribosomal protein L30
b: 50S ribosomal protein L32
c: 50S ribosomal protein L33 1
d: 50S ribosomal protein L34
e: 50S ribosomal protein L35
f: 50S ribosomal protein L36
g: 50S ribosomal protein L31
A: 23S ribosomal RNA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,649,874449
Polymers1,638,67636
Non-polymers11,198413
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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50S ribosomal protein ... , 31 types, 31 molecules 3CDEFGHIJKLMNOPQRSTUWXYZabcdefg

#1: Protein/peptide 50S ribosomal protein bL37


Mass: 2841.375 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QTP4
#4: Protein 50S ribosomal protein L2


Mass: 30425.945 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD4
#5: Protein 50S ribosomal protein L3


Mass: 23011.393 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD1
#6: Protein 50S ribosomal protein L4


Mass: 22920.949 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD2
#7: Protein 50S ribosomal protein L5


Mass: 21152.328 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG1
#8: Protein 50S ribosomal protein L6


Mass: 19483.361 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG4
#9: Protein 50S ribosomal protein L9


Mass: 15949.253 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R7F6
#10: Protein 50S ribosomal protein L10


Mass: 18035.736 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QS62
#11: Protein 50S ribosomal protein L11


Mass: 15023.374 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QS45
#12: Protein 50S ribosomal protein L13


Mass: 16146.689 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSP8
#13: Protein 50S ribosomal protein L14


Mass: 13400.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSF9
#14: Protein 50S ribosomal protein L15


Mass: 15602.244 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG8
#15: Protein 50S ribosomal protein L16


Mass: 15774.240 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD8
#16: Protein 50S ribosomal protein L17


Mass: 21892.246 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSL9
#17: Protein 50S ribosomal protein L18


Mass: 13711.728 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG5
#18: Protein 50S ribosomal protein L19


Mass: 12892.806 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QV42
#19: Protein 50S ribosomal protein L20


Mass: 14494.693 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QYU6
#20: Protein 50S ribosomal protein L21


Mass: 11055.894 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R151
#21: Protein 50S ribosomal protein L22


Mass: 16353.600 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD6
#22: Protein 50S ribosomal protein L23


Mass: 11047.836 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD3
#24: Protein 50S ribosomal protein L25 / General stress protein CTC


Mass: 22571.078 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R3D2
#25: Protein 50S ribosomal protein L27


Mass: 9249.582 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R150
#26: Protein 50S ribosomal protein L28


Mass: 6891.016 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QV03
#27: Protein 50S ribosomal protein L29


Mass: 8790.895 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSD9
#28: Protein 50S ribosomal protein L30


Mass: 7022.147 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG7
#29: Protein 50S ribosomal protein L32


Mass: 6467.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R3I9
#30: Protein 50S ribosomal protein L33 1


Mass: 6468.501 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QS39
#31: Protein/peptide 50S ribosomal protein L34


Mass: 5522.580 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R7K0
#32: Protein 50S ribosomal protein L35


Mass: 7298.505 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QYU7
#33: Protein/peptide 50S ribosomal protein L36


Mass: 4341.277 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSL4
#34: Protein 50S ribosomal protein L31


Mass: 8312.485 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0R215

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Protein , 2 types, 3 molecules 56V

#2: Protein Translation elongation factor EF-G


Mass: 75420.797 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycolicibacterium smegmatis MC2 155 (bacteria)
Gene: MSMEG_6535 / Production host: Escherichia coli (E. coli) / References: UniProt: A0R6G0
#23: Protein Large ribosomal subunit protein uL24 / 50S ribosomal protein L24


Mass: 11228.946 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: UniProt: A0QSG0

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RNA chain , 2 types, 2 molecules BA

#3: RNA chain 5S ribosomal RNA


Mass: 38061.816 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
References: GenBank: 118168627
#35: RNA chain 23S ribosomal RNA


Mass: 1014391.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)

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Non-polymers , 3 types, 413 molecules

#36: Chemical ChemComp-GNP / PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER


Mass: 522.196 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H17N6O13P3 / Feature type: SUBJECT OF INVESTIGATION
Comment: GppNHp, GMPPNP, energy-carrying molecule analogue*YM
#37: Chemical...
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 407 / Source method: obtained synthetically / Formula: Mg
#38: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn

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Details

Has ligand of interestY
Has protein modificationN

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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: EF-G2 bound 50S ribosomal subunit complex of M. smegmatis
Type: COMPLEX / Entity ID: #1-#2, #35, #3-#34 / Source: NATURAL
Molecular weightValue: 1.8 MDa / Experimental value: YES
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Buffer solutionpH: 7.8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %

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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 defocus max: 3300 nm / Nominal defocus min: 1800 nm / Cs: 2.7 mm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 54 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 39621 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 7XAM

7xam


Accession code: 7XAM / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.007116558
ELECTRON MICROSCOPYf_angle_d0.693173430
ELECTRON MICROSCOPYf_dihedral_angle_d16.56943830
ELECTRON MICROSCOPYf_chiral_restr0.03722073
ELECTRON MICROSCOPYf_plane_restr0.00610279

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