dc.creatorGranjeiro P.A.
dc.creatorFerreira C.V.
dc.creatorGranjeiro J.M.
dc.creatorTaga E.M.
dc.creatorAoyama H.
dc.date1999
dc.date2015-06-30T15:23:03Z
dc.date2015-11-26T15:30:01Z
dc.date2015-06-30T15:23:03Z
dc.date2015-11-26T15:30:01Z
dc.date.accessioned2018-03-28T22:38:34Z
dc.date.available2018-03-28T22:38:34Z
dc.identifier
dc.identifierPhysiologia Plantarum. , v. 107, n. 2, p. 151 - 158, 1999.
dc.identifier319317
dc.identifier10.1034/j.1399-3054.1999.100201.x
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0033405301&partnerID=40&md5=70a548e4768709f44df0762ecda82b04
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/101296
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/101296
dc.identifier2-s2.0-0033405301
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1261904
dc.descriptionAn acid phosphatase (EC 3.1.3.2) has been identified and purified from castor bean (Ricinus communis L., IAC-80) seed through sulphopropyl (SP)-Sephadex, diethylaminoethyl (DEAE)-Sephadex, Sephacryl S-200, and Concanavalin A-Sepharose chromatography. The enzyme was purified 2000-fold to homogeneity, with a final specific activity of 3.8 μkat mg-1 protein. The purified enzyme revealed a single diffuse band with phosphatase activity on nondenaturing polyacrylamide gel electrophoresis, at pH 8.3. The relative molecular mass, determined by high-performance liquid chromatography (HPLC), was found to be 60 kDa. The acid phosphatase had a pH optimum of 5.5 and an apparent K(m) value for p-nitrophenylphosphate of 0.52 mM. The enzyme-catalyzed reaction was inhibited by inorganic phosphate, fluoride, vanadate, molybdate, p-chloromercuribenzoate (pCMB), Cu2+ and Zn2+. The strong inhibition by pCMB, Cu2+ and vanadate suggests the presence of sulfhydryl groups essential for catalysis. The castor bean enzyme also recognized tyrosine-phosphate and inorganic pyrophosphate (PP(i)) as substrate. The highest specificity constant (V(max)/K(m)) was observed with PP(i), making it a potential physiological substrate.
dc.description107
dc.description2
dc.description151
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dc.languageen
dc.publisher
dc.relationPhysiologia Plantarum
dc.rightsfechado
dc.sourceScopus
dc.titlePurification And Kinetic Properties Of A Castor Bean Seed Acid Phosphatase Containing Sulfhydryl Groups
dc.typeArtículos de revistas


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