2zvf

Crystal structure of Archaeoglobus fulgidus alanyl-tRNA synthetase C-terminal dimerization domain

spinqualitylabelsall models 2zvf, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2zvf is a 8 chain structure with sequence from Archaeoglobus fulgidus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: MSE Related: 2ztg Gene: AF_2255, alaS (Archaeoglobus fulgidus) Activity: Alanine--tRNA ligase, with EC number 6.1.1.7 Resources: FirstGlance, OCA, RCSB, PDBsum, TOPSAN Function [SYA_ARCFU] Catalyzes the attachment of alanine to tRNA(Ala) in a two-step reaction: alanine is first activated by ATP to form Ala-AMP and then transferred to the acceptor end of tRNA(Ala). Incorrectly charged aminoacyl-tRNA(Ala) is also edited in situ by the editing domain. 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 Alanyl-tRNA synthetase (AlaRS) specifically recognizes the major identity determinant, the G3:U70 base pair, in the acceptor stem of tRNA(Ala) by both the tRNA-recognition and editing domains. In this study, we solved the crystal structures of 2 halves of Archaeoglobus fulgidus AlaRS: AlaRS-DeltaC, comprising the aminoacylation, tRNA-recognition, and editing domains, and AlaRS-C, comprising the dimerization domain. The aminoacylation/tRNA-recognition domains contain an insertion incompatible with the class-specific tRNA-binding mode. The editing domain is fixed tightly via hydrophobic interactions to the aminoacylation/tRNA-recognition domains, on the side opposite from that in threonyl-tRNA synthetase. A groove formed between the aminoacylation/tRNA-recognition domains and the editing domain appears to be an alternative tRNA-binding site, which might be used for the aminoacylation and/or editing reactions. Actually, the amino acid residues required for the G3:U70 recognition are mapped in this groove. The dimerization domain consists of helical and globular subdomains. The helical subdomain mediates dimerization by forming a helix-loop-helix zipper. The globular subdomain, which is important for the aminoacylation and editing activities, has a positively-charged face suitable for tRNA binding. Unique protein architecture of alanyl-tRNA synthetase for aminoacylation, editing, and dimerization.,Naganuma M, Sekine S, Fukunaga R, Yokoyama S Proc Natl Acad Sci U S A. 2009 May 26;106(21):8489-94. Epub 2009 May 7. PMID:19423669 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA Synthetase

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