Macromolecule Content

• Total Structure Weight: 8.13 kDa 
• Atom Count: 569 
• Modelled Residue Count: 71 
• Deposited Residue Count: 71 
• Unique protein chains: 1

1AH9

THE STRUCTURE OF THE TRANSLATIONAL INITIATION FACTOR IF1 FROM ESCHERICHIA COLI, NMR, 19 STRUCTURES

• DOI: 10.2210/pdb1AH9/pdb

• Classification: RIBOSOME BINDING
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1997-04-16 Released: 1997-07-07 
• Deposition Author(s): Sette, M., Van Tilborg, P., Spurio, R., Kaptein, R., Paci, M., Gualerzi, C.O., Boelens, R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 19 
• Selection Criteria: LEAST RESTRAINT VIOLATIONS 

Literature

The structure of the translational initiation factor IF1 from E.coli contains an oligomer-binding motif.

Sette, M., van Tilborg, P., Spurio, R., Kaptein, R., Paci, M., Gualerzi, C.O., Boelens, R.

(1997) EMBO J 16: 1436-1443

• PubMed: 9135158 
• DOI: 10.1093/emboj/16.6.1436
• Primary Citation of Related Structures:  
  1AH9


• PubMed Abstract: 
  

The structure of the translational initiation factor IF1 from Escherichia coli has been determined with multidimensional NMR spectroscopy. Using 1041 distance and 78 dihedral constraints, 40 distance geometry structures were calculated, which were refined by restrained molecular dynamics. From this set, 19 structures were selected, having low constraint energy and few constraint violations. The ensemble of 19 structures displays a root-mean-square deviation versus the average of 0.49 A for the backbone atoms and 1.12 A for all atoms for residues 6-36 and 46-67. The structure of IF1 is characterized by a five-stranded beta-barrel. The loop connecting strands three and four contains a short 3(10) helix but this region shows considerably higher flexibility than the beta-barrel. The fold of IF1 is very similar to that found in the bacterial cold shock proteins CspA and CspB, the N-terminal domain of aspartyl-tRNA synthetase and the staphylococcal nuclease, and can be identified as the oligomer-binding motif. Several proteins of this family are nucleic acid-binding proteins. This suggests that IF1 plays its role in the initiation of protein synthesis by nucleic acid interactions. Specific changes of NMR signals of IF1 upon titration with 30S ribosomal subunit identifies several residues that are involved in the interaction with ribosomes.

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Organizational Affiliation: 

Bijvoet Center for Biomolecular Research, Utrecht University, The Netherlands.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INITIATION FACTOR 1	A	71	Escherichia coli	Mutation(s): 0
Find proteins for P69222 (Escherichia coli (strain K12)) Explore P69222  Go to UniProtKB:  P69222

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 19 
• Selection Criteria: LEAST RESTRAINT VIOLATIONS 
• OLDERADO: 1AH9 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-04-16 
• Released Date: 1997-07-07 
Deposition Author(s): Sette, M., Van Tilborg, P., Spurio, R., Kaptein, R., Paci, M., Gualerzi, C.O., Boelens, R.

Revision History  

• Version 1.0: 1997-07-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance