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Nucleic Acids Res. 2002 May 1;30(9):2011-7.

Predominance of six different hexanucleotide recoding signals 3' of read-through stop codons.

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Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA.


Redefinition of UAG, UAA and UGA to specify a standard amino acid occurs in response to recoding signals present in a minority of mRNAs. This 'read-through' is in competition with termination and is utilized for gene expression. One of the recoding signals known to stimulate read-through is a hexanucleotide sequence of the form CARYYA 3' adjacent to the stop codon. The present work finds that of the 91 unique viral sequences annotated as read-through, 90% had one of six of the 64 possible codons immediately 3' of the read-through stop codon. The relative efficiency of these read-through contexts in mammalian tissue culture cells has been determined using a dual luciferase fusion reporter. The relative importance of the identity of several individual nucleotides in the different hexanucleotides is complex.

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