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Facile Recoding of Selenocysteine in Nature

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [2];  [3];  [3];  [3];  [4]
  1. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry; Yale Univ., New Haven, CT (United States)
  2. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. Yale Univ., New Haven, CT (United States). Dept. of Molecular Biophysics and Biochemistry, and Dept. of Chemistry
Selenocysteine (Sec or U) is encoded by UGA, a stop codon reassigned by a Sec-specific elongation factor and a distinctive RNA structure. To discover possible code variations in extant organisms we analyzed 6.4 trillion base pairs of metagenomic sequences and 24,903 microbial genomes for tRNASec species. As expected, UGA is the predominant Sec codon in use. We also found tRNASec species that recognize the stop codons UAG and UAA, and ten sense codons. Selenoprotein synthesis programmed by UAG in Geodermatophilus and Blastococcus, and by the Cys codon UGU in Aeromonas salmonicida was confirmed by metabolic labeling with 75Se or mass spectrometry. Other tRNASec species with different anticodons enabled Escherichia coli to synthesize active formate dehydrogenase H, a selenoenzyme. This illustrates the ease by which the genetic code may evolve new coding schemes, possibly aiding organisms to adapt to changing environments. Lastly, our results reveal that the genetic code is much more flexible than previously thought.
Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-98ER20311; AC02-05CH11231
OSTI ID:
1467447
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 17 Vol. 55; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (21)

Endogenous Stochastic Decoding of the CUG Codon by Competing Ser- and Leu-tRNAs in Ascoidea asiatica journal July 2018
Crystal structures of the human elongation factor eEFSec suggest a non-canonical mechanism for selenocysteine incorporation journal October 2016
Novel Ciliate Genetic Code Variants Including the Reassignment of All Three Stop Codons to Sense Codons in Condylostoma magnum journal August 2016
An integrated, structure- and energy-based view of the genetic code journal July 2016
Transfer RNAs with novel cloverleaf structures journal October 2016
Human selenoprotein P and S variant mRNAs with different numbers of SECIS elements and inferences from mutant mice of the roles of multiple SECIS elements journal November 2016
Computational identification of the selenocysteine tRNA (tRNASec) in genomes journal February 2017
Versatility of Synthetic tRNAs in Genetic Code Expansion journal November 2018
Eine einfache Methode zur Produktion von Selenoproteinen journal May 2018
A Facile Method for Producing Selenocysteine-Containing Proteins journal May 2018
Pyrrolysine in archaea: a 22nd amino acid encoded through a genetic code expansion journal November 2018
Drugging tRNA aminoacylation journal November 2017
Challenges of site-specific selenocysteine incorporation into proteins by Escherichia coli journal November 2017
Recoding of the selenocysteine UGA codon by cysteine in the presence of a non-canonical tRNA Cys and elongation factor SelB journal November 2017
Ribosomal frameshifting and transcriptional slippage: From genetic steganography and cryptography to adventitious use journal July 2016
Measurements of translation initiation from all 64 codons in E. coli journal February 2017
Measurements of translation initiation from all 64 codons in E. coli journal July 2016
The complete and fully assembled genome sequence of Aeromonas salmonicida subsp. pectinolytica and its comparative analysis with other Aeromonas species: investigation of the mobilome in environmental and pathogenic strains journal January 2018
Frozen Accident Pushing 50: Stereochemistry, Expansion, and Chance in the Evolution of the Genetic Code journal May 2017
Drugging tRNA aminoacylation text January 2018
Drugging tRNA aminoacylation text January 2018

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