2pmd | pdb_00002pmd

The structures of aIF2gamma subunit from the archaeon Sulfolobus solfataricus in the GDP-bound form.

spinqualitylabelsall models 2pmd, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2pmd is a 2 chain structure with sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GDP, GNP, PPV Related: 2aho Gene: eif2g (Sulfolobus solfataricus) Resources: FirstGlance, OCA, RCSB, PDBsum Function [IF2G_SULSO] eIF-2 functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA (By similarity). 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 Heterotrimeric a/eIF2alphabetagamma (archaeal homologue of the eukaryotic translation initiation factor 2 with alpha, beta and gamma subunits) delivers charged initiator tRNA (tRNAi) to the small ribosomal subunit. In this work, we determined the structures of aIF2gamma from the archaeon Sulfolobus solfataricus in the nucleotide-free and GDP-bound forms. Comparison of the free, GDP and Gpp(NH)p-Mg2+ forms of aIF2gamma revealed a sequence of conformational changes upon GDP and GTP binding. Our results show that the affinity of GDP to the G domain of the gamma subunit is higher than that of Gpp(NH)p. In analyzing a pyrophosphate molecule binding to domain II of the gamma subunit, we found a cleft that is very suitable for the acceptor stem of tRNA accommodation. It allows the suggestion of an alternative position for Met-tRNA i Met on the alphagamma intersubunit dimer, at variance with a recently published one. In the model reported here, the acceptor stem of the tRNAi is approximately perpendicular to that of tRNA in the ternary complex elongation factor Tu-Gpp(NH)p-tRNA. According to our analysis, the elbow and T stem of Met-tRNA i Met in this position should make extensive contact with the alpha subunit of aIF2. Thus, this model is in good agreement with experimental data showing that the alpha subunit of aIF2 is necessary for the stable interaction of aIF2gamma with Met-tRNA i Met. New insights into the interactions of the translation initiation factor 2 from archaea with guanine nucleotides and initiator tRNA.,Nikonov O, Stolboushkina E, Nikulin A, Hasenohrl D, Blasi U, Manstein DJ, Fedorov R, Garber M, Nikonov S J Mol Biol. 2007 Oct 19;373(2):328-36. Epub 2007 Aug 2. PMID:17825838 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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