dc.contributor | Universidade Federal de São Paulo (UNIFESP) | |
dc.contributor | Universidade de São Paulo (USP) | |
dc.contributor | Universidade Federal do Rio de Janeiro (UFRJ) | |
dc.contributor | Universidade Estadual de Campinas (UNICAMP) | |
dc.creator | Fernandes, Eloise Cedro [UNIFESP] | |
dc.creator | Granjeiro, José Mauro | |
dc.creator | Taga, Eulázio Mikio | |
dc.creator | Meyer-Fernandes, José Roberto | |
dc.creator | Aoyama, Hiroshi | |
dc.date.accessioned | 2016-01-24T12:33:45Z | |
dc.date.available | 2016-01-24T12:33:45Z | |
dc.date.created | 2016-01-24T12:33:45Z | |
dc.date.issued | 2003-03-28 | |
dc.identifier | Fems Microbiology Letters. Hoboken: Wiley-Blackwell, v. 220, n. 2, p. 197-206, 2003. | |
dc.identifier | 0378-1097 | |
dc.identifier | http://repositorio.unifesp.br/handle/11600/27180 | |
dc.identifier | 10.1016/S0378-1097(03)00091-0 | |
dc.identifier | WOS:000182130500006 | |
dc.description.abstract | Procyclic forms of Trypanosoma brucei possess a phosphatase activity on their external cell surface. This activity, while it dephosphorylates [P-32]phosphocasein, is inhibited weakly by NaF and tartrate but strongly by vanadate. in this work, we describe the presence of an external phosphatase activity in intact bloodstream forms of T brucei. With p-nitrophenyl phosphate (pNPP) as substrate, these intact cells produced 3-5 nmol pNP min(-1) mg(-1), linearly for up to at least 30 min. the activity was not significantly increased by Mg2+, Mn2+, Ca2+ and Co2+, but was inhibited by vanadate, NaF, p-chloromercuribenzoate and Zn2+ and was insensitive to okadaic acid. Membrane-enriched fractions of parasites contained an acid phosphatase activity, with a pH optimum in the range of 4.5-5.5. This activity hydrolyzed phosphotyrosine (40 nmol phosphate min(-1) mg(-1)) better than phosphothreonine or phosphoserine. Partial purification of this phosphatase yielded a single activity band following gel electrophoresis, a K-m value of 0.29 mM with pNPP and was insensitive to the Fe2+/H2O2/ascorbate system. (C) 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved. | |
dc.language | eng | |
dc.publisher | Wiley-Blackwell | |
dc.relation | Fems Microbiology Letters | |
dc.rights | http://olabout.wiley.com/WileyCDA/Section/id-406071.html | |
dc.rights | Acesso aberto | |
dc.subject | phosphotyrosine phosphatase | |
dc.subject | bloodstream forms | |
dc.subject | Trypanosoma brucei | |
dc.title | Phosphatase activity characterization on the surface of intact bloodstream forms of Trypanosoma brucei | |
dc.type | Artigo | |