Lysyl-tRNA synthetase from Myxococcus xanthus catalyzes the formation of diadenosine penta- and hexaphosphates from adenosine tetraphosphate

Manami Oka, Kaoru Takegawa, Yoshio Kimura

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Myxococcus xanthus lysyl-tRNA synthetase (LysS) produces diadenosine tetraphosphate (Ap4A) from ATP in the presence of Mn2+; in the present study, it also generated Ap4 from ATP and triphosphate. When ATP and Ap4 were incubated with LysS and pyrophosphatase, first Ap4A, Ap5A, and ADP, and then Ap5, Ap6A, and Ap3A were generated. The results suggest that in the first step, LysS can form lysyl-AMP and lysyl-ADP intermediates from Ap4 and release triphosphate and diphosphate, respectively, whereas in the second step, it can produce Ap5 from lysyl-ADP with triphosphate, and Ap6A from lysyl-ADP with Ap4. In addition, in the presence of Ap4 and pyrophosphatase, but absence of ATP, LysS also generates diadenosine oligophosphates (ApnAs: n = 3–6). These results indicate that LysS has the ability to catalyze the formation of various ApnAs from Ap4 in the presence of pyrophosphatase. Furthermore, the formation of Ap4A by LysS was inhibited by tRNALys in the presence of 1 mM ATP. To the best of our knowledge, this is the first report of Ap5A and Ap6A synthesis by lysyl-tRNA synthetase.

本文言語英語
ページ(範囲)152-158
ページ数7
ジャーナルArchives of Biochemistry and Biophysics
604
DOI
出版ステータス出版済み - 8 15 2016

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 生化学
  • 分子生物学

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