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Titolo:
VANADATE OLIGOANIONS INTERACT WITH THE PROTON EJECTION BY THE CA2-RETICULUM( PUMP OF SARCOPLASMIC)
Autore:
AURELIANO M; MADEIRA VMC;
Indirizzi:
UNIV COIMBRA,DEPT ZOOL P-3049 COIMBRA PORTUGAL UNIV COIMBRA,DEPT BIOQUIM P-3049 COIMBRA PORTUGAL
Titolo Testata:
Biochemical and biophysical research communications
fascicolo: 1, volume: 205, anno: 1994,
pagine: 161 - 167
SICI:
0006-291X(1994)205:1<161:VOIWTP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
CALCIUM-TRANSPORT; CA-2+-ATPASE; ATPASE; IONS; PHOTOCLEAVAGE; MANGANESE; VESICLES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
M. Aureliano e V.M.C. Madeira, "VANADATE OLIGOANIONS INTERACT WITH THE PROTON EJECTION BY THE CA2-RETICULUM( PUMP OF SARCOPLASMIC)", Biochemical and biophysical research communications, 205(1), 1994, pp. 161-167

Abstract

Decameric vanadate differs from other oligomeric vanadate species in inhibiting Ca2+ uptake and H+ ejection promoted by sarcoplasmic reticulum ATPase. A decavanadate solution, 2 mM in total vanadium, containing about 200 mu M decameric species; inhibits by about 50% the uptake of Ca2+ and by 75% the H+ ejection, whereas 2 mM nominal monovanadate slightly increases the uptake of Ca2+ and inhibits the ejection of H+ by 25%. Moreover, decavanadate linearly increases the Ca2+/H+ ratio, whereas monovanadate mimicks decavanadate behavior only at concentrations up to 1.2 mM. For higher concentrations of monovanadate, this effectis reversed probably due to the formation of metavanadates, namely tetravanadate. It is concluded that Ca2+ uptake is tightly coupled to proton ejection through molecular events that are sensitive to the interaction of vanadate species. Apparently, the stoichiometry is variable and modulated by molecular events involved in vanadate interaction suggesting alterations in the energetic coupling associated with Ca2+ translocation. (C) 1994 Academic Press, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 15:01:50