Download MendeleyBiochemical and Structural Analysis of the Bacterial Enzyme Succinyl-Diaminopimelate Desuccinylase (DapE) from Acinetobacter baumannii.
Kelley, E.H., Minasov, G., Konczak, K., Shuvalova, L., Brunzelle, J.S., Shukla, S., Beulke, M., Thabthimthong, T., Olsen, K.W., Inniss, N.L., Satchell, K.J.F., Becker, D.P.(2024) ACS Omega 9: 3905-3915
- PubMed: 38284080
- DOI: https://doi.org/10.1021/acsomega.3c08231
- Primary Citation of Related Structures:
8F8O - PubMed Abstract:
There is an urgent need for new antibiotics given the rise of antibiotic resistance, and succinyl-diaminopimelate desuccinylase (DapE, E.C. 3.5.1.18) has emerged as a promising bacterial enzyme target. DapE from Haemophilus influenzae ( Hi DapE) has been studied and inhibitors identified, but it is essential to explore DapE from different species to assess selective versus broad-spectrum therapeutics. We have determined the structure of DapE from the ESKAPE pathogen Acinetobacter baumannii ( Ab DapE) and studied inhibition by known inhibitors of Hi DapE. Ab DapE is inhibited by captopril and sulfate comparable to Hi DapE, but Ab DapE was not significantly inhibited by a known indoline sulfonamide Hi DapE inhibitor. Captopril and sulfate both stabilize Hi DapE by increasing the thermal melting temperature ( T m ) in thermal shift assays. By contrast, sulfate decreases the stability of the Ab DapE enzyme, whereas captopril increases the stability. Further, we report two crystal structures of selenomethionine-substituted Ab DapE in the closed conformation, one with Ab DapE in complex with succinate derived from enzymatic hydrolysis of N 6 -methyl-l,l-SDAP substrate and acetate (PDB code 7T1Q, 2.25 Å resolution), and a crystal structure of Ab DapE with bound succinate along with l-(S)-lactate, a product of degradation of citric acid from the crystallization buffer during X-ray irradiation (PDB code 8F8O, 2.10 Å resolution).
- Department of Chemistry and Biochemistry, Loyola University Chicago, 1032 West Sheridan Road, Chicago, Illinois 60660, United States.
Organizational Affiliation:
