dc.creator | Granjeiro P.A. | |
dc.creator | Ferreira C.V. | |
dc.creator | Granjeiro J.M. | |
dc.creator | Taga E.M. | |
dc.creator | Aoyama H. | |
dc.date | 1999 | |
dc.date | 2015-06-30T15:23:03Z | |
dc.date | 2015-11-26T15:30:01Z | |
dc.date | 2015-06-30T15:23:03Z | |
dc.date | 2015-11-26T15:30:01Z | |
dc.date.accessioned | 2018-03-28T22:38:34Z | |
dc.date.available | 2018-03-28T22:38:34Z | |
dc.identifier | | |
dc.identifier | Physiologia Plantarum. , v. 107, n. 2, p. 151 - 158, 1999. | |
dc.identifier | 319317 | |
dc.identifier | 10.1034/j.1399-3054.1999.100201.x | |
dc.identifier | http://www.scopus.com/inward/record.url?eid=2-s2.0-0033405301&partnerID=40&md5=70a548e4768709f44df0762ecda82b04 | |
dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/101296 | |
dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/101296 | |
dc.identifier | 2-s2.0-0033405301 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1261904 | |
dc.description | An 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.description | 107 | |
dc.description | 2 | |
dc.description | 151 | |
dc.description | 158 | |
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dc.language | en | |
dc.publisher | | |
dc.relation | Physiologia Plantarum | |
dc.rights | fechado | |
dc.source | Scopus | |
dc.title | Purification And Kinetic Properties Of A Castor Bean Seed Acid Phosphatase Containing Sulfhydryl Groups | |
dc.type | Artículos de revistas | |