NDLI: sid1, a gene initiating siderophore biosynthesis in Ustilago maydis: molecular characterization, regulation by iron, and role in phytopathogenicity.

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sid1, a gene initiating siderophore biosynthesis in Ustilago maydis: molecular characterization, regulation by iron, and role in phytopathogenicity.

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sid1, a gene initiating siderophore biosynthesis in Ustilago maydis: molecular characterization, regulation by iron, and role in phytopathogenicity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mei, B. Budde, A. D. Leong, S. A.
Description	Author Affiliation: Mei B ( Department of Plant Pathology, University of Wisconsin, Madison 53706.);
Abstract	Iron uptake in Ustilago maydis is mediated by production of extracellular hydroxamate siderophores. L-Or-nithine N5-oxygenase catalyzes hydroxylation of L-ornithine, which is the first committed step of ferrichrome and ferrichrome A biosynthesis in U. maydis. We have characterized sid1, a gene coding for this enzyme, by complementation in trans, gene disruption, and DNA sequence analysis. A comparison of genomic DNA and cDNA sequences has shown that the gene is interrupted by three introns. The putative amino acid sequence revealed similarity with Escherichia coli lysine N6-hydroxylase, which catalyzes the hydroxylation of lysine, the first step in biosynthesis of aerobactin. Two transcription initiation points have been determined, both by PCR amplification of the 5' end of the mRNA and by primer extension. A 2.3-kb transcript which accumulates in cells grown under low iron conditions was detected by Northern hybridization. A less abundant 2.7-kb transcript was observed in cells grown in iron-containing medium. By contrast, constitutive accumulation of the 2.3-kb transcript was observed in a mutant carrying a disruption of urbs1, a gene involved in regulation of siderophore biosynthesis. Analysis of the pathogenicity of mutants carrying a null allele of sid1 suggests that the biosynthetic pathway of siderophores does not play an essential role in the infection of maize by U. maydis.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	3
Volume Number	90
Language	English
Publisher	National Academy of Sciences
Publisher Date	1993-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Gene Expression Regulation, Fungal Drug Effects Genes, Fungal Genetics Pharmacology Mixed Function Oxygenases Siderophores Biosynthesis Ustilago Amino Acid Sequence Chromosome Mapping Cloning, Molecular Molecular Sequence Data Mutagenesis, Insertional RNA, Messenger Sequence Homology, Amino Acid Enzymology Pathogenicity Virulence Zea Mays Microbiology Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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