title: Cavities create a potential back door in epoxide hydrolase Rv1938 from Mycobacterium tuberculosis-A molecular dynamics simulation study.
abstract: Mycobacterium tuberculosis (Mtb) is the causative organism of tuberculosis. Extensively drug resistant strains and latency have posed formidable challenges in the treatment of tuberculosis. The current study addresses an alpha/beta hydrolase fold bearing enzyme, epoxide hydrolase Rv1938 from Mtb. Epoxide hydrolases are involved in detoxification processes, catabolism and regulation of signaling molecules. Using GROMACS, a 100ns Molecular Dynamics (MD) simulation was performed for Rv1938. Cavities were identified within the protein at various time frames of the simulation and their volumes were computed. During MD simulation, in addition to the substrate binding cavity, opening of two new cavities located behind the active site was observed. These cavities may be similar to the backdoor proposed for acetylcholinesterase. Structural superimposition of epoxide hydrolase from Mtb with the epoxide hydrolase of Agrobacterium radiobacter1 AD1 (Ephy) indicates that cavity1 in Mtb lies at an identical position to that of the water tunnel in Ephy. Further, docking of the substrate and an inhibitor with protein structures obtained from MD simulation at various time frames was also performed. The potential role of these cavities is discussed.
authors.affiliation: Centre for Biotechnology, Anna University, Chennai 600 025, India.
authors.forename: Anitha
authors.initials: A
authors.lastname: Selvan
authors.affiliation: Centre for Biotechnology, Anna University, Chennai 600 025, India. Electronic address: sharmi.anishetty@gmail.com.
authors.forename: Sharmila
authors.initials: S
authors.lastname: Anishetty
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D004851:Epoxide Hydrolases / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D009169:Mycobacterium tuberculosis / Q000201:enzymology*; D011487:Protein Conformation
chemical_list: D001426:Bacterial Proteins; D004851:Epoxide Hydrolases
keywords: Backdoor; Cavity; Epoxide hydrolase; Molecular docking; Molecular dynamics simulation; Tuberculosis