conformational changes of the ca2+ , mg2+-atpase during the catalytic cycle were studied in the stabilized intermediates by the use of fluorescent and spin probes , which were introduced at specific sh groups of atpase , namely one highly reactive but functionally nonessential ( shn ) and one essential for the decomposition of the e-p intermediate ( shd ) [ kawakita , m. , et al . ( 1980 ) j. biochem . 87 , 609-617 ] .
C0001477
mg2
C0001473
atpase