Design, synthesis and analysis of inhibitors of bacterial aspartate semialdehyde dehydrogenase

Unsaturated and fluorinated analogues of aspartyl-beta-phosphate were synthesised as potential inhibitors of the bacterial enzyme aspartate semialdehyde dehydrogenose (ASA-DH). Acetylenic and Z-olefinic analogues showed competitive inhibition, but an E-oleflnic analogue was inactive. A monofluoromethylene phosphonate competed poorly, but showed time-dependent inhibition of ASA-DH in the absence of phosphate. Simulated docking procedures were used to rationalise the results. These studies showed that substrate and inhibitor binding are mediated by interaction with two active-site arginine residues, and for likely covalent attachment to the active-site thiol group, electrophilic carbon atoms should be located 4.5 angstrom, or less, from the thiol.