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Designing seryl‐ tRNA synthetase for improved serylation of selenocysteine tRNA s

Journal Article · · FEBS Letters
 [1];  [1];  [1];  [2]
  1. Department of Molecular Biophysics &, Biochemistry Yale University New Haven CT USA
  2. Department of Molecular Biophysics &, Biochemistry Yale University New Haven CT USA, Department of Chemistry Yale University New Haven CT USA

Selenocysteine (Sec) lacks a cognate aminoacyl‐ tRNA synthetase. Instead, seryl‐ tRNA synthetase (Ser RS ) produces Ser‐ tRNA S ec , which is subsequently converted by selenocysteine synthase to Sec‐ tRNA S ec . Escherichia coli Ser RS serylates tRNA S ec poorly; this may hinder efficient production of designer selenoproteins in vivo . Guided by structural modelling and selection for chloramphenicol acetyltransferase activity, we evolved three Ser RS variants capable of improved Ser‐ tRNA S ec synthesis. They display 10‐, 8‐, and 4‐fold increased k cat / K M values compared to wild‐type Ser RS using synthetic tRNA S ec species as substrates. The enzyme variants also facilitate in vivo read‐through of a UAG codon in the position of the critical serine 146 of chloramphenicol acetyltransferase. These results indicate that the naturally evolved Ser RS is capable of further evolution for increased recognition of a specific tRNA isoacceptor.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; FG02-98ER20311
OSTI ID:
1478680
Alternate ID(s):
OSTI ID: 1610393
Journal Information:
FEBS Letters, Journal Name: FEBS Letters Journal Issue: 22 Vol. 592; ISSN 0014-5793
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Netherlands
Language:
English

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