Pectinase (endo-polygalacturonase) is the key enzyme splitting plant pectin. The corresponding single gene PGU1 is documented for the yeast S. cerevisiae. On the basis of phylogenetic analysis of the PGU nucleotide sequence available in the GenBank, a family of divergent PGU genes is found in the species complex S. bayanus: S. bayanus var. uvarum, S. eubayanus, and hybrid taxon S. pastorianus. The PGU genes have different chromosome localization.
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