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Yct1p, a novel, high-affinity, cysteine-specific transporter from the yeast Saccharomyces cerevisiae.

DIR@IMTECH: CSIR-Institute of Microbial Technology

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Title Yct1p, a novel, high-affinity, cysteine-specific transporter from the yeast Saccharomyces cerevisiae.
 
Creator Kaur, Jaspreet
Bachhawat, Anand K
 
Subject QR Microbiology
 
Description Cysteine transport in the yeast Saccharomyces cerevisiae is mediated by at least eight different permeases, none of which are specific for cysteine. We describe a novel, high-affinity, (K(m) = 55 microM), cysteine-specific transporter encoded by the ORF YLL055w that was initially identified by a combined strategy of data mining, bioinformatics, and genetic analysis. Null mutants of YLL055w, but not of the other genes encoding for transporters that mediate cysteine uptake such as GAP1, GNP1, MUP1, or AGP1 in a met15Delta background, resulted in a growth defect when cysteine, at low concentrations, was provided as the sole sulfur source. Transport experiments further revealed that Yll055wp was the major contributor to cysteine transport under these conditions. The contributions of the other transporters became relevant only at higher concentrations of cysteine or when YLL055w was either deleted or repressed. YLL055w expression was repressed by organic sulfur sources and was mediated by the Met4p-dependent sulfur regulatory network. The results reveal that YLL055w encodes the principal cysteine transporter in S. cerevisiae, which we have named YCT1 (yeast cysteine transporter). Interestingly, Yct1p belongs to the Dal5p family of transporters rather than the amino acid permease family to which all the known amino acid transporters belong.
 
Publisher Genetics Society of America
 
Date 2007-06
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://crdd.osdd.net/open/115/1/bachhawat2007.1.pdf
Kaur, Jaspreet and Bachhawat, Anand K (2007) Yct1p, a novel, high-affinity, cysteine-specific transporter from the yeast Saccharomyces cerevisiae. Genetics, 176 (2). pp. 877-90. ISSN 0016-6731
 
Relation http://www.genetics.org/content/176/2/877.full.pdf+html
http://crdd.osdd.net/open/115/