Download MendeleyDiscovery of a cystathionine gamma-lyase (CSE) selective inhibitor targeting active-site pyridoxal 5'-phosphate (PLP) via Schiff base formation.
Echizen, H., Hanaoka, K., Shimamoto, K., Hibi, R., Toma-Fukai, S., Ohno, H., Sasaki, E., Komatsu, T., Ueno, T., Tsuchiya, Y., Watanabe, Y., Otsuka, T., Saito, H., Nagatoishi, S., Tsumoto, K., Kojima, H., Okabe, T., Shimizu, T., Urano, Y.(2023) Sci Rep 13: 16456-16456
- PubMed: 37777556
- DOI: https://doi.org/10.1038/s41598-023-43536-6
- Primary Citation of Related Structures:
8J6N - PubMed Abstract:
D,L-Propargylglycine (PAG) has been widely used as a selective inhibitor to investigate the biological functions of cystathionine γ-lyase (CSE), which catalyzes the formation of reactive sulfur species (RSS). However, PAG also inhibits other PLP (pyridoxal-5'-phosphate)-dependent enzymes such as methionine γ-lyase (MGL) and L-alanine transaminase (ALT), so highly selective CSE inhibitors are still required. Here, we performed high-throughput screening (HTS) of a large chemical library and identified oxamic hydrazide 1 as a potent inhibitor of CSE (IC 50 = 13 ± 1 μM (mean ± S.E.)) with high selectivity over other PLP-dependent enzymes and RSS-generating enzymes. Inhibitor 1 inhibited the enzymatic activity of human CSE in living cells, indicating that it is sufficiently membrane-permeable. X-Ray crystal structure analysis of the complex of rat CSE (rCSE) with 1 revealed that 1 forms a Schiff base linkage with the cofactor PLP in the active site of rCSE. PLP in the active site may be a promising target for development of selective inhibitors of PLP-dependent enzymes, including RSS-generating enzymes such as cystathionine β-synthase (CBS) and cysteinyl-tRNA synthetase 2 (CARS2), which have unique substrate binding pocket structures.
Organizational Affiliation:
Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
