escherichia coli k-12 mutants that carry deletions in their genes for ornithine decarboxylase ( l-ornithine carboxy-lyase , ec 4.1.1.17 ) ( spec ) , arginine decarboxylase ( l-arginine carboxy-lyase , ec 4.1.1.19 ) ( spea ) , and agmatine ureohydrolase ( agmatinase or agmatine amidinohydrolase , ec 3.5.3.11 ) ( speb ) can still synthesize very small amounts of putrescine and spermidine .
C0029282
l-ornithine carboxy-lyase
C0007054
carboxy-lyase