Download Mendeleyalpha-Hydrazino Acids Inhibit Pyridoxal Phosphate-Dependent Decarboxylases via "Catalytically Correct" Ketoenamine Tautomers: A Special Motif for Chemical Biology and Drug Discovery?
Baine, J.M., Duhoo, Y., Doukov, T., Desfosses, A., Bisello, G., Beio, M.L., Bauer, O., Perduca, M., Bacia-Verloop, M., Bertoldi, M., Phillips, R.S., Gutsche, I., Berkowitz, D.B.(2025) ACS Catal 15: 8204-8218
- PubMed: 40401103
- DOI: https://doi.org/10.1021/acscatal.5c00326
- Primary Citation of Related Structures:
9DUI, 9E0M, 9E0O, 9E0Q, 9GNS - PubMed Abstract:
We present evidence that supports a 'correct hydrazone tautomer/Dunathan alignment model' for how α-hydrazino analogues of α-amino acids inhibit PLP enzymes. Described is the asymmetric synthesis of l- and d-α-hydrazino acid l-lysine analogues and their inhibition of Hafnia alvei lysine decarboxylase (LdcI) via kinetic analysis, stopped-flow spectrophotometry, and cryo-EM. We describe a similar investigation of the important anti-Parkinsonism drug, carbidopa, with its human DOPA decarboxylase (hDdc) target. Evidence is consistent with these three hydrazino analogues forming the catalytically relevant ketoenamine PLP-hydrazone tautomer in their target active sites, with the α-carboxylate groups, though insulated, aligning with the PLP-π-system in a Dunathan-model-like orientation. High-resolution cryo-EM structures of the H. alvei LdcI holoenzyme (pdb 9E0M-2.1Å) and LdcI-bound l- and d-hydrazones (pdb 9E0O-2.0 Å; pdb 9E0Q-2.3Å) and the first X-ray crystal structure of hDdc-bound carbidopa (pdb 9GNS-1.93Å) support this 'correct tautomer' model. These insights are expected to guide future PLP enzyme inhibitor development.
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, United States.
Organizational Affiliation:
