Özlem DÖNMEZ YURTPINAR, Tuğba YILMAZ ÖZDEN, Ayşe CAN

Partial purification and some properties of aspartate aminotransferase from the mantle tissue of Mytilus galloprovincialis Lam

Aspartate aminotransferase (E.C.2.6.1.1; AST), is a pyridoxal phosphate dependent enzyme that occurs in virtually all organisms and plays a key role in intermediary nitrogen metabolism. Although AST was purified from a variety of plant and animal sources, it has not been purified previously from mantle tissue of Mytilus galloprovincialis Lam. In the present study we have partially purified AST from the mantle tissue of M. galloprovincialis and investigated some kinetic properties of the enzyme. The partially purified enzyme showed three protein and a single activity band in polyacrylamide gel electrophoresis. It was found that the enzyme exhibited maximum activity at 15ºC and 35ºC and that the activity was decreased at 40ºC and totally lost at 55ºC. AST activity was maximum at pH 7.4 in Tris-HCl buffer. Km values of AST for aspartate and 2-oxoglutarate were 1.64 mM and 2.2x10-2 mM, respectively, and Vmax values for the same substrates were 0.12 U/mL and 0.168 U/mL, respectively

Keywords:

aspartate aminotransferase Mytilus galloprovincialis Lam., mussel, enzyme purification,

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ISSN: 2548-0731
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1965
Yayıncı: İstanbul Üniversitesi

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