3g98 | pdb_00003g98

Crystal Structure of the C-Ala domain from Aquifex aeolicus alanyl-tRNA synthetase

spinqualitylabelsall models 3g98, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3g98 is a 2 chain structure with sequence from "aquifex_aeolicus"_huber_and_stetter_2001 "aquifex aeolicus" huber and stetter 2001. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: alaS ("Aquifex aeolicus" Huber and Stetter 2001) Activity: Alanine--tRNA ligase, with EC number 6.1.1.7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SYA_AQUAE] 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). Also edits incorrectly charged Ser-tRNA(Ala) and Gly-tRNA(Ala) via its editing domain (By similarity).[HAMAP-Rule:MF_00036] 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 Protein synthesis involves the accurate attachment of amino acids to their matching transfer RNA (tRNA) molecules. Mistranslating the amino acids serine or glycine for alanine is prevented by the function of independent but collaborative aminoacylation and editing domains of alanyl-tRNA synthetases (AlaRSs). We show that the C-Ala domain plays a key role in AlaRS function. The C-Ala domain is universally tethered to the editing domain both in AlaRS and in many homologous free-standing editing proteins. Crystal structure and functional analyses showed that C-Ala forms an ancient single-stranded nucleic acid binding motif that promotes cooperative binding of both aminoacylation and editing domains to tRNA(Ala). In addition, C-Ala may have played an essential role in the evolution of AlaRSs by coupling aminoacylation to editing to prevent mistranslation. The C-Ala domain brings together editing and aminoacylation functions on one tRNA.,Guo M, Chong YE, Beebe K, Shapiro R, Yang XL, Schimmel P Science. 2009 Aug 7;325(5941):744-7. PMID:19661429 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminoacyl tRNA Synthetase

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