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1q46

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Revision as of 08:15, 24 February 2018

crystal structure of the eIF2 alpha subunit from saccharomyces cerevisia

Structural highlights

1q46 is a 1 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[IF2A_YEAST] eIF-2 functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA. This complex binds to a 40S ribosomal subunit, followed by mRNA binding to form a 43S preinitiation complex. Junction of the 60S ribosomal subunit to form the 80S initiation complex is preceded by hydrolysis of the GTP bound to eIF-2 and release of an eIF-2-GDP binary complex. In order for eIF-2 to recycle and catalyze another round of initiation, the GDP bound to eIF-2 must exchange with GTP by way of a reaction catalyzed by eIF-2B.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The alpha subunit of translation initiation factor 2 (eIF2alpha) is the target of specific kinases that can phosphorylate a conserved serine residue as part of a mechanism for regulating protein expression at the translational level in eukaryotes. The structure of the 20 kDa N-terminal region of eIF2alpha from Saccharomyces cerevisiae was determined by X-ray crystallography at 2.5A resolution. In most respects, the structure is similar to that of the recently solved human eIF2alpha; the rather elongated protein contains a five-stranded antiparallel beta-barrel in its N-terminal region, followed by an almost entirely helical domain. The S.cerevisiae eIF2alpha lacks a disulfide bridge that is present in the homologous protein in humans and some of the other higher eukaryotes. Interestingly, a conserved loop consisting of residues 51-65 and containing serine 51, the putative phosphorylation site, is visible in the electron density maps of the S.cerevisiae eIF2alpha; most of this functionally important loop was not observed in the crystal structure of the human protein. This loop is relatively exposed to solvent, and contains two short 3(10) helices in addition to some extended structure. Serine 51 is located at the C-terminal end of one of the 3(10) helices and near several conserved positively charged residues. The side-chain of serine 51 is sufficiently exposed so that its phosphorylation would not necessitate a substantial change in the protein structure. The structures and relative positions of residues that have been implicated in kinase binding and in the interaction with guanine nucleotide exchange factor (eIF2B) are described.

The crystal structure of the N-terminal region of the alpha subunit of translation initiation factor 2 (eIF2alpha) from Saccharomyces cerevisiae provides a view of the loop containing serine 51, the target of the eIF2alpha-specific kinases.,Dhaliwal S, Hoffman DW J Mol Biol. 2003 Nov 21;334(2):187-95. PMID:14607111^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Dhaliwal S, Hoffman DW. The crystal structure of the N-terminal region of the alpha subunit of translation initiation factor 2 (eIF2alpha) from Saccharomyces cerevisiae provides a view of the loop containing serine 51, the target of the eIF2alpha-specific kinases. J Mol Biol. 2003 Nov 21;334(2):187-95. PMID:14607111

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1q46"

@@ Line 1: / Line 1: @@
 ==crystal structure of the eIF2 alpha subunit from saccharomyces cerevisia==
 <StructureSection load='1q46' size='340' side='right' caption='[[1q46]], [[Resolution|resolution]] 2.86&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1q46]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q46 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Q46 FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q46 OCA], [http://pdbe.org/1q46 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q46 RCSB], [http://www.ebi.ac.uk/pdbsum/1q46 PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1q46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q46 OCA], [http://pdbe.org/1q46 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q46 RCSB], [http://www.ebi.ac.uk/pdbsum/1q46 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1q46 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 11: / Line 12: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q4/1q46_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q4/1q46_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 26: / Line 27: @@
 </div>
 <div class="pdbe-citations 1q46" style="background-color:#fffaf0;"></div>
-==See Also==
-*[[Eukaryotic initiation factor|Eukaryotic initiation factor]]
 == References ==
 <references/>

1q46

From Proteopedia

Revision as of 08:15, 24 February 2018

crystal structure of the eIF2 alpha subunit from saccharomyces cerevisia

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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