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Four permeases import proline and the toxic proline analogue azetidine‐2‐carboxylate into yeast
Author(s) -
Andréasson Claes,
Neve Etienne P. A.,
Ljungdahl Per O.
Publication year - 2004
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.1052
Subject(s) - permease , proline , biology , biochemistry , amino acid , yeast , saccharomyces cerevisiae , transporter , gene
We have found that proline and the toxic proline analogue azetidine‐2‐carboxylate (AzC) are efficiently imported into Saccharomyces cerevisiae cells by four amino acid permeases, including two nitrogen‐regulated permeases ( PUT4 and GAP1 ) and two permeases that are regulated by the SPS sensor of extracellular amino acids ( AGP1 and GNP1 ). In contrast to Agp1p, Gnp1p is not functionally expressed when cells are grown on media containing proline as sole nitrogen source. These findings have implications for the interpretation of studies using AzC to characterize nitrogen source‐dependent regulation of amino acid uptake and of post‐Golgi targeting and localization of amino acid permeases in yeast. Copyright © 2004 John Wiley & Sons, Ltd.