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research-article

GCR3 encodes an acidic protein that is required for expression of glycolytic genes in Saccharomyces cerevisiae.

Division of Biological Chemistry, Tsukuba Research Center (MITI), Ibaraki, Japan.

ABSTRACT

Screening of a mutagenized strain carrying a multicopy ENO1-'lacZ fusion plasmid revealed a new mutation affecting several glycolytic enzyme activities. The recessive single nuclear gene mutation, named gcr3, caused an extremely defective growth phenotype on fermentable carbon sources such as glucose, while growth on respiratory media was almost normal. The GCR3 gene was obtained by growth complementation from a genomic DNA library, and the complemented strains had normal enzyme levels. GCR3 gene was sequenced, and a 99,537-Da protein was predicted. The predicted GCR3 protein was fairly acidic (net charge, -34). The C-terminal region was highly charged, and an acidic stretch was found in it.

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