Browsing by Author "Hayashi, K."
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Item Effects of chelators and metal ions on purified leucine-specific aminopeptidase from aeromonas caviae T-58(Animal Science Association of Nigeria, 2007) Abu, O. A.; Nirasawa, S.; Kitaoka, M.; Hayashi, K.An extracellular, aminopeptidase (AMP) of a bacterial soil isolate, Aeromonas caviae T-58, was purified to eleclrophorclically homogeneity by ammonium sulfate precipitation and ion-exchange chromatography (Q-Sepharose fast flow and Mono-Q column) to 48-fold with a yield of 3.0%. The purified native enzyme is a monomer and exhibited a single band with molecular weight of 32 kDa estimated by SDS/polyaciylamide-gel electrophoresis. The enzyme was inactivated by Mn2+, Co 2+, Cu2+, and Cd2+, but not affected by Ca2+ Ba2+, Zn2+, AI3+, NI2+, LI2+ Pb2+ and Mg2+. EDTA completely inhibited enzyme activity indicative of the enzyme to a metalloenzyme type. The addition of I mM Zn2+ restored 100% activity of EDTA-inhibited enzyme while I mM Co2+ restored 10% activity. However, the addition of equimolar concentrations of both metals showed a non co- catalytic effect, as residual activity reduced to 90%. The enzyme therefore possibly belongs to a catalytic family of Zn2+ metalloenzyme and does not require Ca2+ for enzymatic activation. The purified enzyme showed a high affinity for L-Leu- p-nitroanilide and valine but not with proline, glycine or alanine-pNA.Item The pH and thermal response of purified leucine-specific aminopeptidase from aeromonas caviae(Animal Science Association of Nigeria, 2008-09) Abu, O. A.; Hayashi, K.A purified extracellular monomeric leucine-specifìc aminopeptidase from Aeromonas caviae T-58 with molecular mass of 32 kDa was subjected to varying pH and temperature conditions to determine its response. The activity of the enzyme was maximal at 65°C but stable up to 40°C. Optimum pH was 8.0 and pH stability had a range of 6 and 10.