title: Effect of group specific reagents on the Mg2 +/- dependent activity of purified Micrococcus lysodeikticus ATPase.
abstract: A series of group specific reagents has been examined for their ability to inactivate Micrococcus lysodeikticus adenosine triphosphatase assayed with Mg2+ as activating divalent cation. The enzyme activity was not inhibited by sulphydryl, carboxyl, histidine, arginine and methionine specific reagents at inhibitor concentrations below 2 mM. However, the ATPase was inactivated by its chemical reaction with either one molecule of trinitrobenzenesulfonic acid or tetranitromethane, or two to four molecules of N-bromosuccinimide. These results suggest that at least one amino group, one tyrosine and two to four tryptophans are involved in the Mg2+-dependent binding or hydrolysis of ATP.
mesh_terms: D000255:Adenosine Triphosphate / Q000037:antagonists & inhibitors / Q000378:metabolism*; D001974:Bromosuccinimide / Q000494:pharmacology; D004794:Enzyme Repression; D008274:Magnesium / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008837:Micrococcus / Q000187:drug effects / Q000201:enzymology*; D013774:Tetranitromethane / Q000494:pharmacology; D014302:Trinitrobenzenesulfonic Acid / Q000494:pharmacology
chemical_list: D000255:Adenosine Triphosphate; D014302:Trinitrobenzenesulfonic Acid; D008274:Magnesium; D013774:Tetranitromethane; D001974:Bromosuccinimide