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pubmed-article:9016848pubmed:abstractTextWe have already described the separation of two brain soluble fractions by Sephadex G-50, one of which stimulates (peak I) and the other inhibits (peak II) Na+, K(+)-ATPase and K(+)-p-nitrophenylphosphatase (K(+)-p-NPPase) activities. Here we examine the features of synaptosomal membrane p-NPPase activity in the presence and absence of brain peak I. It was observed that stimulation of Mg2+, K(+)-p-NPPase activity by peak I was concentration dependent. The ability of peak I to stimulate p-NPPase activity was lost by heat treatment followed by brief centrifugation. Pure serum albumin also stimulated enzyme activity. K(+)-p-NPPase stimulation by peak I proved dependent on K+ concentration but independent of Mg2+ and substrate p-nitrophenylphosphate concentrations. Since our determinations were performed in a non-phosphorylating condition reflecting the Na+, K(+)-ATPase Na+ site, it is suggested that peak I may stimulate the Na+-dependent enzyme phosphorylation known to take place from the internal cytoplasmic side.lld:pubmed
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pubmed-article:9016848pubmed:authorpubmed-author:Rodríguez...lld:pubmed
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pubmed-article:9016848pubmed:pagination215-9lld:pubmed
pubmed-article:9016848pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:9016848pubmed:year1997lld:pubmed
pubmed-article:9016848pubmed:articleTitleKinetics of K(+)-p-nitrophenyl phosphatase stimulation by a brain soluble fraction.lld:pubmed
pubmed-article:9016848pubmed:affiliationInstituto de Biologia Cellular y Neurociencias Prof. Eduardo De Robertis, Facultad de Medicina, Universidad de Buenos Aires, Paraguay, Argentina.lld:pubmed
pubmed-article:9016848pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9016848pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed