2002年8月
Transition state stabilization by the N-terminal anticodon-binding domain of lysyl-tRNA synthetase
JOURNAL OF BIOLOGICAL CHEMISTRY
- ,
- 巻
- 277
- 号
- 32
- 開始ページ
- 29275
- 終了ページ
- 29282
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1074/jbc.M200481200
- 出版者・発行元
- AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Lysyl-tRNA synthetase from Bacillus stearothermophilus (B.s. LysRS) (EC 6.1.1.6) catalyzes aminoacylation of tRNA(Lys) with L-lysine, in which L-lysine was first activated with ATP to yield an enzyme (lysyladenylate complex), and then the lysine molecule was transferred from the complex to tRNA(Lys). B.s. LysRS is a homodimeric enzyme with a subunit that consists of two domains, an N-terminal tRNA anticodon-binding domain (TAB-ND: Ser(1)-Pro(144)) and a C-terminal Class II-specific catalytic domain (CAT-CD: Lys(151)-Lys(493)). CAT-CD alone retained catalytic activity, although at a low level; TAB-ND alone showed no activity. Size exclusion chromatography revealed that CAT-CD exists as a dimer, whereas TAB-ND was a monomer. The formation of a complex consisting of these domains was detected with the guidance of surface plasmon resonance. In accordance with this, the addition of TAB-ND to CAT-CD significantly enhanced both the L-lysine activation and the tRNA aminoacylation reactions. Kinetic analysis showed that deletion of TAB-ND resulted in a significant destabilization of the transition state of CAT-CD in the L-lysine activation reaction but had little effect on the ground state of substrate binding. A significant role of a cross-subunit interaction in the enzyme between TAB-ND and CAT-CD was proposed for the stabilization of the transition state in the L-lysine activation reaction.
- リンク情報
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- DOI
- https://doi.org/10.1074/jbc.M200481200
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902109848259067
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/12019264
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000177342600117&DestApp=WOS_CPL
- ID情報
-
- DOI : 10.1074/jbc.M200481200
- ISSN : 0021-9258
- J-Global ID : 200902109848259067
- PubMed ID : 12019264
- Web of Science ID : WOS:000177342600117