Stankiewicz AJ. Direct deamination of AMP, ADP, ATP and NADH by non-specific adenylate deaminase in the foot muscle of the snail Helix pomatia.
Biochem J 1983;
215:39-44. [PMID:
6626180 PMCID:
PMC1152361 DOI:
10.1042/bj2150039]
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Abstract
Homogeneous adenylate deaminase from snail foot muscle deaminated 5'-AMP, 5'-ADP, 5'-ATP and NADH with similar velocity and affinity to all substrates. At millimolar concentration NAD+ was also deaminated to a comparable extent, but NADP+, NADPH and FAD were not substrates for the snail enzyme. The amount of deaminase activity per g of fresh tissue is 5-10 times greater than in the muscle of any other species studied. The activity of the snail deaminase is regulated by pH, KCl and buffer concentrations, and Pi; however, regulation seems to be very poor in comparison with that of muscle deaminases from other species, specific to 5'-AMP. Snail enzyme appears as the first animal deaminase so far described that has such characteristics. It offers also some opportunities as an analytical tool as a consequence of its very high affinity toward adenylates.
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