Ornithine cyclodeaminase from Ti plasmid C58: DNA sequence, enzyme properties and regulation of activity by arginine - PubMed (original) (raw)
Ornithine cyclodeaminase from Ti plasmid C58: DNA sequence, enzyme properties and regulation of activity by arginine
N Sans et al. Eur J Biochem. 1988.
Free article
Abstract
Nopaline, an abundant opine in plant cells transformed with nopaline-type Ti plasmids, is catabolized in Agrobacterium by three Ti-plasmid-coded steps via arginine and ornithine to proline. The last enzyme, ornithine cyclodeaminase (OCD), converts ornithine directly into proline with release of ammonia. We describe the DNA sequence of the ocd gene from Ti plasmid C58, antiserum against an OCD fusion protein overexpressed in Escherichia coli, induction and identification of the gene product in Agrobacterium and enzymatic properties of the protein. The DNA sequence suggests a soluble protein with a stretch of some homology with ornithine carbamoyltransferases from other bacteria. OCD activity is subject to substrate inhibition, is stimulated by NAD+ (presumably acting as a catalytic cofactor) and is regulated by L-arginine which has pronounced effects on the optima for pH and temperature and on the Km for ornithine. The regulation of OCD activity by L-arginine is discussed as part of the mechanisms which integrate the pathway of Ti-plasmid-coded opine utilization with general metabolism in Agrobacterium.
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