Dominant and Recessive Suppressors That Restore Glucose Transport in a Yeast Snf3 Mutant

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 1991 Jul 1

PMID 1874412

Citations 20

Authors

L Neigeborn

D Coons

L Bisson

M Carlson

Affiliations

Soon will be listed here.

Abstract

The SNF3 gene of Saccharomyces cerevisiae encodes a high-affinity glucose transporter that is homologous to mammalian glucose transporters. To identify genes that are functionally related to SNF3, we selected for suppressors that remedy the growth defect of snf3 mutants on low concentrations of glucose or fructose. We recovered 38 recessive mutations that fall into a single complementation group, designated rgt1 (restores glucose transport). The rgt1 mutations suppress a snf3 null mutation and are not linked to snf3. A naturally occurring rgt1 allele was identified in a laboratory strain. We also selected five dominant suppressors. At least two are tightly linked to one another and are designated RGT2. The RGT2 locus was mapped 38 cM from SNF3 on chromosome IV. Kinetic analysis of glucose uptake showed that the rgt1 and RGT2 suppressors restore glucose-repressible high-affinity glucose transport in a snf3 mutant. These mutations identify genes that may regulate or encode additional glucose transport proteins.

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