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. 1996 Nov 15;320(Pt 1):173–179.

New type of hexameric ornithine carbamoyltransferase with arginase activity in the cephamycin producers Streptomyces clavuligerus and Nocardia lactamdurans.

J L De la Fuente 1, J F Martin 1, P Liras 1
PMCID: PMC1217913  PMID: 8947483

Abstract

The ornithine carbamoyltransferases (OTCases) from the beta-lactam-producing actinomycetes Streptomyces clavuligerus and Nocardia lactamdurans have been purified to near-homogeneity by delta-N-phosphonoacetylornithine-Sepharose 4B affinity chromatography. The S. clavuligerus and N. lactamdurans OTCases monomers had a molecular mass of 37 kDa. The native OTCases of S. clavuligerus, N. lactamdurans and Streptomyces coelicolor had molecular masses of 248, 251 and 247 kDa respectively, which correspond to a hexameric structure. The apparent K(m) values for ornithine and carbamoylphosphate of the S. clavuligerus enzyme were respectively 2.3 and 6.0 mM at pH 8.0. The enzyme showed a reverse activity on citrulline and used lysine and putrescine as substrates. The hexameric complex showed coupled arginase-OTCase activities and was able to convert arginine into citrulline in a carbamoylphosphate-dependent manner. The requirement for carbamoylphosphate might prevent the arginase-OTCase complex from carrying out a futile cycle of arginine biosynthesis and degradation.

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Selected References

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