ISSN:
1432-0983
Keywords:
Key words Yeast
;
Glutamine permease
;
*Membrane transport
;
Nitrogen-regulated gene expression
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Glutamine uptake in S. cerevisiae is mediated by at least three transporters: high- and low-affinity glutamine permeases and the general amino-acid permease. We have isolated the gene encoding the high-affinity glutamine permease and named it GNP1. The amino-acid sequence of GNP1, and its hydropathy profile of 12 transmembrane domains, closely resemble those of known amino-acid permeases. The Km of GNP1 for glutamine uptake was determined to be 0.59 mM. Cells lacking GNP1 exhibit reduced levels of glutamine transport, and are resistant to a toxic analog of glutamine, L-glutamic acid γ-monohydroxamate. Unlike other amino-acid permeases, whose expression is nitrogen-source limited, GNP1 is expressed on both rich and poor nitrogen sources.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002940050108
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