Irreversible inhibition of aldolase by a phosphorylated α-dicarbonyl compound

Abstract

The preparation of a phosphorylated α-dicarbonyl compound designed to specifically react with arginine residues of enzymes accepting phosphorylated compounds as effectors is reported, and shown to inhibit rabbit muscle aldolase in a time-dependent and irreversible manner. This irreversible inhibition occured in a buffer devoid of borate ions, suggesting that the presence of the phosphate moiety contributes in the stabilization of the adduct formed with arginine residues. Under the same conditions, the metalloenzyme iron superoxide dismutase, in which an arginine is known to be critical for the catalytic function, is not significantly inhibited.

Keywords::

• α-Diketo
• inhibition
• Arginine-specific reagent
• Superoxide dismutase