Kinetics and thermodynamics of irreversible inhibition of matrix metalloproteinase 2 by a Co(III) Schiff base complex

Allison S. Harney, Laura B. Sole, Thomas J. Meade*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Cobalt(III) Schiff base complexes have been used as potent inhibitors of protein function through the coordination to histidine residues essential for activity. The kinetics and thermodynamics of the binding mechanism of Co(acacen)(NH3)2Cl [Co(acacen); where H2acacen is bis(acetylacetone)ethylenediimine] enzyme inhibition has been examined through the inactivation of matrix metalloproteinase 2 (MMP-2) protease activity. Co(acacen) is an irreversible inhibitor that exhibits time- and concentration-dependent inactivation of MMP-2. Co(acacen) inhibition of MMP-2 is temperature-dependent, with the inactivation increasing with temperature. Examination of the formation of the transition state for the MMP-2/Co(acacen) complex was determined to have a positive entropy component indicative of greater disorder in the MMP-2/Co(acacen) complex than in the reactants. With further insight into the mechanism of Co(acacen) complexes, Co(III) Schiff base complex protein inactivators can be designed to include features regulating activity and protein specificity. This approach is widely applicable to protein targets that have been identified to have clinical significance, including matrix metalloproteinases. The mechanistic information elucidated here further emphasizes the versatility and utility of Co(III) Schiff base complexes as customizable protein inhibitors. Graphical abstract: Irreversible inhibition of matrix metalloproteinase 2 (MMP-2) protease activity by the Co(III) Schiff base complex [Co(acacen)(NH3)2Cl] is dependent on time and concentration. The slow inhibition is temperature-dependent, with inhibition increasing with temperature. The positive entropy observed is likely a result of deformation of the protein secondary structure upon Co(acacen)(NH 3)2Cl binding.[Figure not available: see fulltext.]

Original languageEnglish (US)
Pages (from-to)853-860
Number of pages8
JournalJournal of Biological Inorganic Chemistry
Issue number6
StatePublished - Aug 2012


  • Cobalt
  • Histidine
  • Matrix metalloproteinase
  • Protein inhibition

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Kinetics and thermodynamics of irreversible inhibition of matrix metalloproteinase 2 by a Co(III) Schiff base complex'. Together they form a unique fingerprint.

Cite this