Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 47.7 kDa 
• Atom Count: 3,483 
• Modelled Residue Count: 398 
• Deposited Residue Count: 410 
• Unique protein chains: 1

 4M2L

Gamma subunit of the translation initiation factor 2 from Sulfolobus solfataricus in nucleotide-free form

• PDB DOI: 10.2210/pdb4M2L/pdb

• Classification: TRANSLATION
• Organism(s): Saccharolobus solfataricus P2
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-08-05 Released: 2014-03-12 
• Deposition Author(s): Nikonov, O.S., Stolboushkina, E.A., Arkhipova, V.I., Gabdulkhakov, A.G., Nikulin, A.D., Garber, M.B., Nikonov, S.V.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.228 
• R-Value Work: 0.188 
• R-Value Observed: 0.190 

Literature

Conformational transitions in the gamma subunit of the archaeal translation initiation factor 2.

Nikonov, O., Stolboushkina, E., Arkhipova, V., Kravchenko, O., Nikonov, S., Garber, M.

(2014) Acta Crystallogr D Biol Crystallogr 70: 658-667

• PubMed: 24598735 
• DOI: 10.1107/S1399004713032240
• Primary Citation of Related Structures:  
  4M0L, 4M2L, 4M4S, 4M53


• PubMed Abstract: 
  

In eukaryotes and archaea, the heterotrimeric translation initiation factor 2 (e/aIF2) is pivotal for the delivery of methionylated initiator tRNA (Met-tRNA(i)) to the ribosome. It acts as a molecular switch that cycles between inactive (GDP-bound) and active (GTP-bound) states. Recent studies show that eIF2 can also exist in a long-lived eIF2γ-GDP-P(i) (inorganic phosphate) active state. Here, four high-resolution crystal structures of aIF2γ from Sulfolobus solfataricus are reported: aIF2γ-GDPCP (a nonhydrolyzable GTP analogue), aIF2γ-GDP-formate (in which a formate ion possibly mimics P(i)), aIF2γ-GDP and nucleotide-free aIF2γ. The structures describe the different states of aIF2γ and demonstrate the conformational transitions that take place in the aIF2γ `life cycle'.

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Organizational Affiliation: 

Institute of Protein Research, Russian Academy of Sciences, Pushchino 142290, Moscow Region, Russian Federation.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Translation initiation factor 2 subunit gamma	A	410	Saccharolobus solfataricus P2	Mutation(s): 0  Gene Names: eif2g, SSO0412 EC: 3.6.5.3
UniProt
Find proteins for Q980A5 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)) Explore Q980A5  Go to UniProtKB:  Q980A5

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
PO4	F [auth A], G [auth A], H [auth A], I [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
EDO	AA [auth A], BA [auth A], CA [auth A], DA [auth A], EA [auth A], FA [auth A], GA [auth A], HA [auth A], IA [auth A], J [auth A], JA [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A], Q [auth A], R [auth A], S [auth A], T [auth A], U [auth A], V [auth A], W [auth A], X [auth A], Y [auth A], Z [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.228 
• R-Value Work: 0.188 
• R-Value Observed: 0.190 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 95.815	α = 90
b = 95.815	β = 90
c = 165.24	γ = 120

Software Package:

Software Name	Purpose
XDS	data scaling
PHASER	phasing
PHENIX	refinement
XDS	data reduction
SADABS	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-03-12 
Deposition Author(s): Nikonov, O.S., Stolboushkina, E.A., Arkhipova, V.I., Gabdulkhakov, A.G., Nikulin, A.D., Garber, M.B., Nikonov, S.V.

Revision History  

• Version 1.0: 2014-03-12
  Type: Initial release
  
• Version 1.1: 2020-01-01
  Changes: Database references