Inhibition of the dapE-Encoded N-Succinyl-L,L-diaminopimelic Acid Desuccinylase from Neisseria meningitidis by L-Captopril.Starus, A., Nocek, B., Bennett, B., Larrabee, J.A., Shaw, D.L., Sae-Lee, W., Russo, M.T., Gillner, D.M., Makowska-Grzyska, M., Joachimiak, A., Holz, R.C.
(2015) Biochemistry 54: 4834-4844
- PubMed: 26186504
- DOI: 10.1021/acs.biochem.5b00475
- Primary Citation of Related Structures:
- PubMed Abstract:
Binding of the competitive inhibitor L-captopril to the dapE-encoded N-succinyl-L,L-diaminopimelic acid desuccinylase from Neisseria meningitidis (NmDapE) was examined by kinetic, spectroscopic, and crystallographic methods. L-Captopril, an angiotens ...
Binding of the competitive inhibitor L-captopril to the dapE-encoded N-succinyl-L,L-diaminopimelic acid desuccinylase from Neisseria meningitidis (NmDapE) was examined by kinetic, spectroscopic, and crystallographic methods. L-Captopril, an angiotensin-converting enzyme (ACE) inhibitor, was previously shown to be a potent inhibitor of the DapE from Haemophilus influenzae (HiDapE) with an IC50 of 3.3 μM and a measured Ki of 1.8 μM and displayed a dose-responsive antibiotic activity toward Escherichia coli. L-Captopril is also a competitive inhibitor of NmDapE with a Ki of 2.8 μM. To examine the nature of the interaction of L-captopril with the dinuclear active site of DapE, we have obtained electron paramagnetic resonance (EPR) and magnetic circular dichroism (MCD) data for the enzymatically hyperactive Co(II)-substituted forms of both HiDapE and NmDapE. EPR and MCD data indicate that the two Co(II) ions in DapE are antiferromagnetically coupled, yielding an S = 0 ground state, and suggest a thiolate bridge between the two metal ions. Verification of a thiolate-bridged dinuclear complex was obtained by determining the three-dimensional X-ray crystal structure of NmDapE in complex with L-captopril at 1.8 Å resolution. Combination of these data provides new insights into binding of L-captopril to the active site of DapE enzymes as well as important inhibitor-active site residue interaction's. Such information is critical for the design of new, potent inhibitors of DapE enzymes.
∥Department of Chemistry and Biochemistry, Middlebury College, Middlebury, Vermont 05753, United States.,‡Center for Structural Genomics of Infectious Diseases, Computation Institute, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States.,#Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States.,†Department of Chemistry and Biochemistry, Loyola University-Chicago, 1068 West Sheridan Road, Chicago, Illinois 60626, United States.,⊥Department of Chemistry, Silesian University of Technology, 44-100 Gliwice, Poland.,§Department of Physics, Marquette University, Milwaukee, Wisconsin 53201, United States.