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KMID : 0380219990320060547
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Journal of Biochemistry and Molecular Biology
1999 Volume.32 No. 6 p.547 ~ p.553
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Methionine Analogue Probes Functionally Important Residues in Active Site of Methionyl-tRNA Synthetase
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Jo Yeong-Joon
Lee Sang-Won
Jo Myung-Kyun
Lee Jee-Woo
Kang Mee-Kyoung
Yoon Jeong-Hyeok
Kim Sung-Hoon
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Abstract
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Aminoacyl-tRNA synthetases are essential enzymes catalyzing the attachment of specific amino acids to cognate tRNAs. In the present work, the substrate analogue L-methionine hydroxamate was used to identify functional residues located in the active site of the E. coli methionyl-tRNA synthetase (MetRS). This compound inhibited bacteria, yeast, and human MetRS activities to a similar degree, suggesting a conserved active site structure and mechanism between MetRSs of different phylogenetic domains. Mutants of the E. coli MetRS resistant to methionine hydroxamate were also isolated. These mutants contained a substitution either at T10, Y15, or Y94. These residues are highly conserved among the different MetRSs and the mutants showed decreased aminoacylation activity, suggesting their functional and structural significances. The putative roles of these residues are discussed on a structural basis.
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KEYWORD
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Active site, Functional residues, L-Methionine hydroxamate, Methionyl-tRNA synthetase
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