Structural determinants of haloenol lactone-mediated suicide inhibition of canine myocardial calcium-independent phospholipase A2
作者:Lori A. Zupan、Randy H. Weiss、Stanley L. Hazen、Barry L. Parnas、Karl W. Aston、Patrick J. Lennon、Daniel P. Getman、Richard W. Gross
DOI:10.1021/jm00053a012
日期:1993.1
Haloenol lactones are potent mechanism im-based inhibitors of a novel class of calcium-independent phospholipases A2 Which have been implicated as the enzymic mediators of membrane dysfunction during myocardial ischemia (Hazen, S. L.; et al. J. Biol. Chem. 1991, 266,7227-7232). Herein we demonstrate that the ring size, hydrophobic group, and cryptic electrophile in the haloenol lactone moiety are important and modifiable determinants of the inhibitory potency of haloenol lactone-mediated inhibition of calcium-independent phospholipase A2. Direct comparisons between haloenol lactone-mediated inhibition of calcium-independent phospholipase A2 and the absence of inhibition with calcium-dependent phospholipase A2 further underscore the marked differences in the catalytic strategy employed by these two classes of intracellular phospholipases A2.