1887

Abstract

Adaptation of cells to acetic acid requires a hitherto unknown number of proteins. Studies on the gene and its encoded protein in the ascomycetous fungus have revealed an involvement of this protein in the molecular processes of adaptation to acetic acid. Gpr1p belongs to a novel family of conserved proteins in prokaryotic and eukaryotic organisms that is characterized by the two motifs (A/G)NPAPLGL and SYG(X)FW (GPR1_FUN34_YaaH protein family). Analysis of four -dominant mutations and N-terminal deletion analysis of Gpr1p identified the amino acid sequence FGGTLN important for function of this protein in . Deletion of slowed down adaptation to acetic acid, but had no effect on growth in the presence of acetic acid. Expression of is induced by acetic acid and moderately repressed by glucose. It was shown by subcellular fractionation that Gpr1p is an integral membrane protein, which is also suggested by the presence of five to six putative transmembrane spanning regions. Fluorescence microscopy confirmed a localization to the plasma membrane. A model is presented describing a hypothetical function of Gpr1p during adaptation to acetic acid.

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2003-03-01
2020-03-29
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