Brown GW, James J, Henderson RJ, Thomas WN, Robinson RO, Thompson AL, Brown E, Brown SG. Uricolytic enzymes in liver of the Dipnoan Protopterus aethiopicus.
Science 1966;
153:1653-4. [PMID:
5920368 DOI:
10.1126/science.153.3744.1653]
[Citation(s) in RCA: 38] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The enzymes uricase, allantoinase, and allantoicase have been measured in liver preparations of the African lungfish Protopterus aethiopicus. The levels for these enzymes in lungfish liver suggest that the amount of urea formed in vivo in Protopterus via a uricolytic pathway may be greater than that derived via the Ornithine-urea cycle. The operation of a "purine cycle" in lungfish liver is proposed.
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