Nucleic Acids Research, 1990, Vol. 18, No. 21 6339-6345
© 1990
MOLECULAR BIOLOGY |
Sequence analysis suggests that tetra-nucleotides signal the termination of protein synthesis in eukaryotes
Department of Biochemistry, University of Otago Dunedin, New Zealand
*To whom correspondence should be addressed
Received July 5, 1990. Revised October 9, 1990. Accepted October 9, 1990.
An increasing number of cases where tri-nucleotide stop codons do not signal the termination of protein synthesis are being reported. In order to Identify what constitutes an efficient stop signal, we analysed the region around natural stop codons in genes from a wide variety of eukaryotic species and gene families. Certain stop codons and nucteotldes following stop codons are over-represented, and this pattern is accentuated in highly expressed genes. For example, the preferred signal for Saccharomyces cerevisiae and Drosophlia melanogaster highly expressed genes is UAAG, and generally the signals UAA(A/G) and UGA(A/G) are preferred in eukaryotes. The GC% of the organism or DNA region can affect whether there is A or G in the second or fourth positions. We suggest therefore, that the stop codon and the nucteotide following It comprise a tetra-nucleotide stop signal. A model is proposed in which the polypeptide chain release factor, a protein, recognises this sequence, but will tolerate some substitution, particularly A to G in the second or third positions.
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