Thiomandelic acid is a broad spectrum inhibitor of Zinc -lactamases.
Thiomandelic acid is found to be a reasonably potent (submicromolar) inhibitor for all of the MBLs tested, except for the subclass B2 enzyme from A. hydrophila (CphA)[1].
Thiomandelic Acid binds to both metal ions in metallo-β-lactamase and induces positive cooperativity in metal binding[2].
References:
[1]. C Mollard, et al. Thiomandelic acid, a broad spectrum inhibitor of zinc beta-lactamases: kinetic and spectroscopic studies. J Biol Chem. 2001 Nov 30;276(48):45015-23.
[2]. Christian Damblon, et al. The inhibitor thiomandelic acid binds to both metal ions in metallo-beta-lactamase and induces positive cooperativity in metal binding. J Biol Chem. 2003 Aug 1;278(31):29240-51.