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Plant and Cell Physiology, 1963, Vol. 4, No. 4 299-306
© 1963

Article

ORNITHINE CYCLE ENZYMES IN THE BLUE-GREEN ALGA NOSTOC MUSCORUM

OSMUND HOLM-HANSEN1 and G.W. BROWN, JR2

Departments of Botany and Physiological Chemistry, University of Wisconsin, Madison, Wisonsin, U.S.A.

Cell-free extracts of a bacteria-free culture of Nostoc muscorum were used to demonstrate the occurrence of part of the KREBS-HENSELEIT ornithine cycle in blue-green algae. Evidence is presented for the conversion of ammonia and bicarbonate to carbamyl phosphate and the coupling of carbamyl phosphate to ornithtne to yield citrulline. Attempts to demonstrate the conversion of citrulline to arginine were not successful.

1Present address: Scripts Institute of Oceanography, University of California, La Jolla, California, U.S.A.

2Present address: Department of Biochemistry and Nutrition, The University of Texas Medical Branch, Galveston, Texas, U.S.A.

(Received June 18, 1963; )
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