The design and synthesis of a series of highly selective hydroxamate inhibitors of stromelysin-1 (MMP-3) is described.
Among them , we identified the 5-benzoyloxyisoquinolin-1 (2 H) - one derivative as the most selective PARP-2 inhibitor reported so far , with a PARP-2 / PARP-1 selectivity index greater than 60.
We propose to call this enzyme poly (ADP-ribose) polymerase 2 (PARP-2).
Furthermore , stimulation by poly (ADP-ribose) polymerase could not be attributed to its DNA-binding function alone since its fragment , containing only the DNA-binding domain , could not exert full stimulatory effect on DNA polymerase , as of the intact enzyme.
Analysis of ADP-ribose residues by phosphodiesterase hydrolysis showed that the 90-kDa protein was modified by poly ADP-ribosylation.