Two membrane proteins located in the Nag regulon of Candida albicans confer multidrug resistance
Pathogenic fungus Candida albicans can efficiently utilize the aminosugar N-acetylglucosamine (GlcNAc) as energy source. Since the mucosal membrane, the site of infection is rich in amino sugars, this specific adaptation is important for the establishment of infection. The genes encoding for the enz...
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Published in | Biochemical and biophysical research communications Vol. 301; no. 4; pp. 1099 - 1108 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier Inc
21.02.2003
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Subjects | |
Online Access | Get full text |
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Summary: | Pathogenic fungus
Candida albicans can efficiently utilize the aminosugar
N-acetylglucosamine (GlcNAc) as energy source. Since the mucosal membrane, the site of infection is rich in amino sugars, this specific adaptation is important for the establishment of infection. The genes encoding for the enzymes of the GlcNAc catabolic pathway, GlcNAc kinase (
HXK1), GlcNAc-6-phosphate deacetylase (
DAC1), and glucosamine-6-phosphate deaminase (
NAG1), are present in a cluster, the Nag regulon, which is associated with virulence. In this study, we have characterized two genes,
TMP1 and
TMP2, present within the Nag regulon, upstream to
DAC1. They encode two membrane associated sugar transporters of the major facilitator superfamily (MFS). The null mutant of
TMP1 and
TMP2 is able to grow in GlcNAc, implying that they are not involved in GlcNAc transport. However, it shows increased susceptibility to a number of unrelated antifungal compounds such as cycloheximide, 4-nitroquinoline-
N-oxide, and 1–10 phenanthroline. Northern blot analysis revealed that
TMP1 and
TMP2 are upregulated in response to these drugs, suggesting that they function as multiple drug efflux pumps. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0006-291X 1090-2104 |
DOI: | 10.1016/S0006-291X(03)00094-9 |