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Microbiol. Mol. Biol. Rev., 03 1997, 17-32, Vol 61, No. 1
GA Marzluf
In the fungi, nitrogen metabolism is controlled by a complex genetic
regulatory circuit which ensures the preferential use of primary nitrogen
sources and also confers the ability to use many different secondary
nitrogen sources when appropriate. Most structural genes encoding nitrogen
catabolic enzymes are subject to nitrogen catabolite repression, mediated
by positive-acting transcription factors of the GATA family of proteins.
However, certain GATA family members, such as the yeast DAL80 factor, act
negatively to repress gene expression. Selective expression of the genes
which encode enzymes for the metabolism of secondary nitrogen sources is
often achieved by induction, mediated by pathway-specific factors, many of
which have a GAL4-like C6/Zn2 DNA binding domain. Regulation within the
nitrogen circuit also involves specific protein-protein interactions, as
exemplified by the specific binding of the negative-acting NMR protein with
the positive-acting NIT2 protein of Neurospora crassa. Nitrogen metabolic
regulation appears to play a significant role in the pathogenicity of
certain animal and plant fungal pathogens.
Copyright © 1997, American Society for Microbiology
Genetic regulation of nitrogen metabolism in the fungi
Department of Biochemistry, Ohio State University, Columbus 43210, USA. marzluf.1@osu.edu
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