Isolation, Partial Purification and Characterization of a Protease from Ginger Zingiberaceae officinale Roscoe

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dc.contributor.authorBASSA, OBED YAKUBU
dc.date.accessioned2014-03-06T08:16:12Z
dc.date.available2014-03-06T08:16:12Z
dc.date.issued2011-07
dc.descriptionA project submitted to the Postgraduate School, Ahmadu Bello University in partial fulfillment for the award of M. Sc degree. Department of Biochemistry Ahmadu Bello University Zaria Nigeria July 2011en_US
dc.description.abstractProtease from Zingiberaceae officinale Roscoe (cv. Haliya indang) was isolated, purified to homogeneity in a three step procedure involving ammonium sulphate fractionation, gel filtration, and ion-exchange chromatography. The partially purified enzyme was characterized. The enzyme was found to be made up of two sub-units designated ‘ginger protease I and II (GPI & GPII); the subunits had specific activity of 173.88±5.6 and 131.54±3.7mg gelatin/min/mg protein respectively, with purification folds of 3.40 and 2.57 over crude extract. The molecular weights of 23.97 and 25.05 kDa were obtained by SDS-PAGE. The enzyme subunits had similar optimum temperature of 40oC, while retaining high activity at 46oC for GPI and 58oC for GPII suggesting GPI to be more heat labile. The subunits incubated at different temperatures showed highest stability at 40oC, with an optimum pH of 6.0 and 5.5, retaining significant activity within a pH range of 5.5-7.5 for GPI, and 5.0-7.5 for GPII. Mn2+, Zn2+ inhibited the subunits mildly while Hg2+ had a severe inhibition on the subunits. The subunits were also severely inhibited by Iodoacetate (IA), a cysteine protease inhibitor. IA caused a mixed inhibition with KI of 7.8mM and 18.8mM and Ki of 5.6mM and 13.5mM respectively. Time course of activity remained high for about 160 hours of storage at 4oC. The enzyme subunits demonstrated gelatin as its natural substrate over other examined substrates with Km of 0.8475 and 1.163mg/ml and Vmax of 555.56 and 454.55mg gelatin/ml respectively. The properties of this enzyme meet the requirement needed for industrial application of the enzyme.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/3311
dc.language.isoenen_US
dc.subjectIsolation,en_US
dc.subjectPartial,en_US
dc.subjectPurificationen_US
dc.subjectCharacterization,en_US
dc.subjectProtease,en_US
dc.subjectGinger Zingiberaceae,en_US
dc.subjectofficinale Roscoeen_US
dc.titleIsolation, Partial Purification and Characterization of a Protease from Ginger Zingiberaceae officinale Roscoeen_US
dc.typeThesisen_US
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