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Toluene permeabilization differentially affects F- and P-type ATPase activities present in the plasma membrane of Streptococcus mutans BJMBR
Thedei Jr.,G.; Leitão,D.P.S.; Bolean,M.; Paulino,T.P.; Spadaro,A.C.C.; Ciancaglini,P..
Streptococcus mutans membrane-bound P- and F-type ATPases are responsible for H+ extrusion from the cytoplasm thus keeping intracellular pH appropriate for cell metabolism. Toluene-permeabilized bacterial cells have long been used to study total membrane-bound ATPase activity, and to compare the properties of ATPase in situ with those in membrane-rich fractions. The aim of the present research was to determine if toluene permeabilization can significantly modify the activity of membrane-bound ATPase of both F-type and P-type. ATPase activity was assayed discontinuously by measuring phosphate release from ATP as substrate. Treatment of S. mutans membrane fractions with toluene reduced total ATPase activity by approximately 80% and did not allow...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cell permeabilization; F-type ATPase; P-type ATPase; Toluene permeabilization; Streptococcus mutans.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001200002
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