title: Improved preparation and assay and some characteristics of Cl--ATPase activity from Limonium vulgare.
abstract: We present a revised method for the preparation, storage and assay of the Cl--ATPase activity responsible for salt secretion in Limonium vulgare. Altering the centrifugation step improved the yield and linked-enzyme assay for ADP provided a sensitive method for continuous monitoring of Cl--ATPase activity. The activity of untreated membranes was low but fairly stable. Treatment with detergent gave strong stimulation of Cl--ATPase activity ATP between 0.1 and 0.2 mM. Cl- stimulated the activity up to a maximum at 0.13 M Cl-, and the pH optimum was around 6.3 to 6.4.
mesh_terms: D000251:Adenosine Triphosphatases / Q000302:isolation & purification / Q000378:metabolism*; D027321:Anion Transport Proteins; D002462:Cell Membrane / Q000201:enzymology; D002712:Chlorides / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010944:Plants / Q000201:enzymology*
chemical_list: D027321:Anion Transport Proteins; D002712:Chlorides; D000251:Adenosine Triphosphatases; C031652:anion-sensitive ATPases