1mkh

C-terminal domain of methionyl-tRNA synthetase from Pyrococcus abyssi

spinqualitylabelsall models 1mkh, resolution 2.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mkh is a 1 chain structure with sequence from Pyrococcus abyssi. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: metG (Pyrococcus abyssi) Activity: Methionine--tRNA ligase, with EC number 6.1.1.10 Resources: FirstGlance, OCA, RCSB, PDBsum Function [SYM_PYRAB] Is required not only for elongation of protein synthesis but also for the initiation of all mRNA translation through initiator tRNA(fMet) aminoacylation (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 The minimal polypeptide supporting full methionyl-tRNA synthetase (MetRS) activity is composed of four domains: a catalytic Rossmann fold, a connective peptide, a KMSKS domain, and a C-terminal alpha helix bundle domain. The minimal MetRS behaves as a monomer. In several species, MetRS is a homodimer because of a C-terminal domain appended to the core polypeptide. Upon truncation of this C-terminal domain, subunits dissociate irreversibly. Here, the C-terminal domain of dimeric MetRS from Pyrococcus abyssi was isolated and studied. It displays nonspecific tRNA-binding properties and has a crystalline structure closely resembling that of Trbp111, a dimeric tRNA-binding protein found in many bacteria and archaea. The obtained 3D model was used to direct mutations against dimerization of Escherichia coli MetRS. Comparison of the resulting mutants to native and C-truncated MetRS shows that the presence of the appended C-domain improves tRNA(Met) binding affinity. However, dimer formation is required to evidence the gain in affinity. Structure and function of the C-terminal domain of methionyl-tRNA synthetase.,Crepin T, Schmitt E, Blanquet S, Mechulam Y Biochemistry. 2002 Oct 29;41(43):13003-11. PMID:12390027 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA Synthetase

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