7csl

Crystal structure of the archaeal EF1A-EF1B complex

spinqualitylabelsall models 7csl, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7csl is a 4 chain structure with sequence from Pyrococcus horikoshii OT3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function EF1A_PYRHO This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis.[HAMAP-Rule:MF_00118] Publication Abstract from PubMed The ribosomal stalk protein plays a crucial role in functional interactions with translational GTPase factors. It has been shown that the archaeal stalk aP1 binds to both GDP- and GTP-bound conformations of aEF1A through its C-terminal region in two different modes. To obtain an insight into how the aP1*aEF1A binding mode changes during the process of nucleotide exchange from GDP to GTP on aEF1A, we have analyzed structural changes in aEF1A upon binding of the nucleotide exchange factor aEF1B. The isolated archaeal aEF1B has nucleotide exchange ability in the presence of aa-tRNA but not deacylated tRNA, and increases activity of polyphenylalanine synthesis 4-fold. The aEF1B mutation, R90A, results in loss of its original nucleotide exchange activity but retains a remarkable ability to enhance polyphenylalanine synthesis. These results suggest an additional functional role for aEF1B other than in nucleotide exchange. The crystal structure of the aEF1A*aEF1B complex, resolved at 2.0 A resolution, shows marked rotational movement of domain 1 of aEF1A compared to the structure of aEF1A*GDP*aP1, and this conformational change results in disruption of the original aP1 binding site between domains 1 and 3 of aEF1A. The loss of aP1 binding to the aEF1A*aEF1B complex was confirmed by native gel analysis. The results suggest that aEF1B plays a role in switching off the interaction between aP1 and aEF1A*GDP, as well as in nucleotide exchange, and promote translation elongation. Structural insights into the Switching Off of the Interaction between the Archaeal Ribosomal Stalk and aEF1A by Nucleotide Exchange Factor aEF1B.,Suzuki T, Ito K, Miyoshi T, Murakami R, Uchiumi T J Mol Biol. 2021 Jul 23;433(15):167046. doi: 10.1016/j.jmb.2021.167046. Epub 2021 , May 8. PMID:33971210 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Elongation factor 3D structures

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