Alternative pathways for editing non-cognate amino acids by aminoacyl-tRNA synthetases.

Abstract:

:Evidence is presented that the editing mechanisms of aminoacyl-tRNA synthetase operate by two alternative pathways: pre-transfer, by hydrolysis of the non-cognate aminoacyl adenylate; post-transfer, by hydrolysis of the mischarged tRNA. The methionyl-tRNA synthetases from Escherichia coli and Bacillus stearothermophilus and isoleucyl-tRNA synthetase from E. coli, for example, are shown to reject misactivated homocysteine rapidly by the pre-transfer route. A novel feature of this reaction is that homocysteine thiolactone is formed by the facile cyclisation of the homocysteinyl adenylate. Valyl-tRNA synthetases, on the other hand, reject the more readily activated non-cognate amino acids by primarily the post-transfer route. The features governing the choice of pathway are discussed.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Jakubowski H,Fersht AR

doi

10.1093/nar/9.13.3105

subject

Has Abstract

pub_date

1981-07-10 00:00:00

pages

3105-17

issue

13

eissn

0305-1048

issn

1362-4962

journal_volume

9

pub_type

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