3.1.13.1 | acetylation |
residue Lys501 is acetylated in RNase II. This modification, reversibly controlled by the acetyltransferase Pka and the deacetylase CobB, a SIRT family deacetylase, affects binding of the substrate and thus decreases the catalytic activity of RNase II. Acetylation can regulate the activity of a bacterial ribonuclease. Lys501 is the major site of acetylation in this enzyme, but some other lysine residues in RNase II are also susceptible to acetylation. After enzyme inhibitor nicotinamide treatment, the acetylation level of RNase II increases 2-3fold in both wild-type and mutant strains. Inactivation of CobB increased the acetylation of wild-type RNase II |
751728 |