Journal : Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology , vol. 143 , p. 315–318 , 2006
Publisher : Elsevier
International Standard Numbers
Printed : 1096-4959
Electronic : 1879-1107
Publication type : Academic article
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A deoxyribonuclease (DNase) was isolated from viscera of the cold-adapted marine bivalve Icelandic scallop. The 42 kDa DNase was shown
to be a single polypeptide which catalyses DNA hydrolysis in the absence of divalent cations. The isolated enzyme showed maximal activity at pH
6 and no activity above pH 7.2 against native DNA. The scallop DNase was slightly more susceptible to heat denaturation than porcine DNase II
and makes double-strand breaks in circular DNA substrate as the porcine enzyme. The N-terminal sequence of the scallop DNase was shown to be
closely similar to DNase II (EC 126.96.36.199) proteins from other organisms. The scallop DNase is in addition to plancitoxin I from A. planci, the only
DNase II enzyme isolated from marine invertebrates.
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