Jing G, Li L, Li Y, Xie L, Zhang R. Purification and partial characterization of two acid phosphatase forms from pearl oyster (Pinctada fucata).
Comp Biochem Physiol B Biochem Mol Biol 2005;
143:229-35. [PMID:
16380281 DOI:
10.1016/j.cbpb.2005.11.008]
[Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2005] [Revised: 11/08/2005] [Accepted: 11/14/2005] [Indexed: 11/29/2022]
Abstract
The present study describes the details about the acid phosphatase forms in the pearl oyster, Pinctada fucata. Two isoenzymes (AcPase I and II) of acid phosphatase were separated and purified from viscera of pearl oyster, P. fucata to homogeneity by chromatography on DEAE-Sepharose Fast Flow, Sephadex G-200 superfine and ConA Sepharose 4B, and partial biochemical properties of AcPase I and II were studied. AcPase I and AcPase II had molecular weights of 208.8 and 64.3 kDa, respectively. AcPase I was a single polypeptide chain, while AcPase II was a dimeric enzyme composed of two equivalent subunits. AcPase I and II showed optimal pHs at 4.6 and 3.2 with p-nitrophenylphosphate as substrate. The optimal catalytic reaction temperature was 47 degrees C for AcPase I and 57 degrees C for AcPase II. Both enzyme forms were stable when incubated at 50 degrees C for 40 min. Tartrate and fluoride were the most effective inhibitors of the enzymes. Fe(3+), Zn(2+), Cu(2+) and Pb(2+) inhibited the activity of AcPase I and II to differing extents. AcPase I and II were apparently nonspecific and hydrolyzed various phosphoric esters. The different properties of AcPase I and II suggested that the two enzymes may play different roles in the pearl oyster.
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