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The nucleotide sequence of the yeast glycolytic hexokinase isoenzyme PI-gene, HXK1, has been determined by sequencing the yeast DNA insert of the previously isolated plasmid HXK1 clone [Entian et al., Mol. Gen. Genet. 198 (1984) 50-54]. The structural gene sequence included 1452 bp coding for 484 amino acid (aa) residues corresponding to the Mr of 153 605 for the HXK1 monomer. Several initiation regions and termination points were located using nuclease S1 mapping. The HXK1 sequence was 76% homologous with that of HXK2, which is responsible for triggering glucose repression in yeasts. Since HXK1 is not involved in this regulatory system, the regulatory function of HXK2 must correspond to one or more of the differences between both isoenzymes. Most changes in the amino acid sequence were statistically distributed; however, four clustered regions with more than five altered aa residues were identified.
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