Download MendeleyCrystal Structure of Aeromonas hydrophila Cytoplasmic 5'-Methylthioadenosine/S-Adenosylhomocysteine Nucleosidase.
Chen, J., Liu, W., Wang, L., Shang, F., Chen, Y., Lan, J., Gao, P., Ha, N.C., Quan, C., Nam, K.H., Xu, Y.(2019) Biochemistry 58: 3136-3143
- PubMed: 31274299
- DOI: https://doi.org/10.1021/acs.biochem.9b00174
- Primary Citation of Related Structures:
6K2Q - PubMed Abstract:
5'-Methylthioadenosine/ S -adenosyl-l-homocysteine (MTA/SAH) nucleosidase (MTAN) is an important enzyme in a number of critical biological processes. Mammals do not express MtaN, making this enzyme an attractive antibacterial drug target. In pathogen Aeromonas hydrophila , two MtnN subfamily genes (MtaN-1 and MtaN-2) play important roles in the periplasm and cytosol, respectively. We previously reported structural and functional analyses of MtaN-1, but little is known regarding MtaN-2 due to the lack of a crystal structure. Here, we determined the crystal structure of cytosolic A. hydrophila MtaN-2 in complex with adenine (ADE), which is a cleavage product of adenosine. Ah MtaN-1 and Ah MtaN-2 exhibit a high degree of similarity in the α-β-α sandwich fold of the core structural motif. However, there is a structural difference in the nonconserved extended loop between β7 and α3 that is associated with the channel depth of the substrate-binding pocket and dimerization. The ADE molecules in the substrate-binding pockets of Ah MtaN-1 and Ah MtaN-2 are stabilized with π-π stacking by Trp199 and Phe152, respectively, and the hydrophobic residues surrounding the ribose-binding sites differ. A structural comparison of Ah MtaN-2 with other MtaN proteins showed that MtnN subfamily proteins exhibit a unique substrate-binding surface and dimerization interface.
Organizational Affiliation:
Department of Bioengineering, College of Life Science , Dalian Minzu University , Dalian 116600 , Liaoning , China.
