The corrected nucleotide sequences of the TaqI restriction and modification enzymes reveal a thirteen-codon overlap

Francis Barany, Barton Slatko, Michael Danzitz, David Cowburn, Ira Schildkraut, Geoffrey G. Wilson

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The nucleotide sequence of the genes encoding methyltransferase TaqI (M·TaqI) and restriction endonuclease TaqI (R·TaqI) with the recognition sequence, TCGA, were analyzed in clones isolated from independent libraries. The genes, originally reported as 363 and 236 codons long [Slatko et al., Nucleic Acids Res. 15 (1987)9781-9796] were redetermined as 421 and 263 codons long, respectively. The C terminus of the taqIM gene overlaps the N terminus of the taqIR gene by 13 codons, as observed with the isoschizomeric TthHB8I restriction-modification system [Barany et al., Gene 112 (1992) 13-20]. Removal of the overlapping codons did not interfere with in vivo M·TaqI activity. We postulate the overlap plays a role in regulating taqIR expression.

Original languageEnglish (US)
Pages (from-to)91-95
Number of pages5
JournalGene
Volume112
Issue number1
DOIs
StatePublished - Mar 1 1992
Externally publishedYes

Keywords

  • Evolution of restriction-modification systems
  • RNA hairpin structure
  • overlapping genes
  • protein-DNA interactions
  • recombinant DNA

ASJC Scopus subject areas

  • Genetics

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