Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 106.58 kDa 
• Atom Count: 880 
• Modelled Residue Count: 880 
• Deposited Residue Count: 880 
• Unique protein chains: 2
• Unique nucleic acid chains: 1

 1ZN0

Coordinates of RRF and EF-G fitted into Cryo-EM map of the 50S subunit bound with both EF-G (GDPNP) and RRF

• PDB DOI: 10.2210/pdb1ZN0/pdb
• EM Map EMD-1127: EMDB EMDataResource

• Classification: TRANSLATION/BIOSYNTHETIC PROTEIN/RNA
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 2005-05-11 Released: 2005-06-14 
• Deposition Author(s): Gao, N., Zavialov, A.V., Li, W., Sengupta, J., Valle, M., Gursky, R.P., Ehrenberg, M., Frank, J.

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 15.5 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Mechanism for the disassembly of the posttermination complex inferred from cryo-EM studies.

Gao, N., Zavialov, A.V., Li, W., Sengupta, J., Valle, M., Gursky, R.P., Ehrenberg, M., Frank, J.

(2005) Mol Cell 18: 663-674

• PubMed: 15949441 
• DOI: 10.1016/j.molcel.2005.05.005
• Primary Citation of Related Structures:  
  1ZN0, 1ZN1


• PubMed Abstract: 
  

Ribosome recycling, the disassembly of the posttermination complex after each round of protein synthesis, is an essential step in mRNA translation, but its mechanism has remained obscure. In eubacteria, recycling is catalyzed by RRF (ribosome recycling factor) and EF-G (elongation factor G). By using cryo-electron microscopy, we have obtained two density maps, one of the RRF bound posttermination complex and one of the 50S subunit bound with both EF-G and RRF. Comparing the two maps, we found domain I of RRF to be in the same orientation, while domain II in the EF-G-containing 50S subunit is extensively rotated (approximately 60 degrees) compared to its orientation in the 70S complex. Mapping the 50S conformation of RRF onto the 70S posttermination complex suggests that it can disrupt the intersubunit bridges B2a and B3, and thus effect a separation of the two subunits. These observations provide the structural basis for the mechanism by which the posttermination complex is split into subunits by the joint action of RRF and EF-G.

---

Related Citations: 

• Locking and unlocking of ribosomal motions
  Valle, M., Zavialov, A., Sengupta, J., Rawat, U., Ehrenberg, M., Frank, J.
  (2003) Cell 114: 123

• Crystal structure of the ribosome recycling factor from E.coli
  Kim, K.K., Min, K., Suh, S.W.
  (2000) EMBO J 19: 2362

---

Organizational Affiliation: 

Wadsworth Center, State University of New York at Albany, Empire State Plaza, Albany, New York 12201, USA.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Ribosome recycling factor	B [auth A]	185	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P0A805 (Escherichia coli (strain K12)) Explore P0A805  Go to UniProtKB:  P0A805

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
ELONGATION FACTOR G	C [auth B]	655	Escherichia coli	Mutation(s): 0

Entity ID: 1
Molecule	Chains	Length	Organism	Image
16S RIBOSOMAL RNA	A [auth C]	40	Escherichia coli

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 15.5 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-06-14 
Deposition Author(s): Gao, N., Zavialov, A.V., Li, W., Sengupta, J., Valle, M., Gursky, R.P., Ehrenberg, M., Frank, J.

Revision History  

• Version 1.0: 2005-06-14
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance