Crystal structure of the cold-adapted haloalkane dehalogenase DpcA from Psychrobacter cryohalolentis K5

0505903 - ÚMG 2020 RIV US eng J - Journal Article
Tratsiak, K. - Prudnikova, Tatyana - Drienovská, I. - Damborský, J. - Brynda, Jiří - Pachl, P. - Kutý, Michal - Chaloupková, R. - Řezáčová, Pavlína - Kutá Smatanová, Ivana
Crystal structure of the cold-adapted haloalkane dehalogenase DpcA from Psychrobacter cryohalolentis K5.
Acta Crystallographica Section F-Structural Biology Communications. Roč. 75, Pt 5 (2019), s. 324-331. E-ISSN 2053-230X
Institutional support: RVO:68378050 ; RVO:61388971
Keywords : haloalkane dehalogenase * alpha/beta-hydrolase * X-ray diffraction * psychrophiles * structural analysis * Psychrobacter cryohalolentis
OECD category: Biophysics; Biochemistry and molecular biology (MBU-M)
Impact factor: 0.968, year: 2019
Method of publishing: Limited access
http://scripts.iucr.org/cgi-bin/paper?S2053230X19002796

Haloalkane dehalogenases (HLDs) convert halogenated aliphatic pollutants to less toxic compounds by a hydrolytic mechanism. Owing to their broad substrate specificity and high enantioselectivity, haloalkane dehalogenases can function as biosensors to detect toxic compounds in the environment or can be used for the production of optically pure compounds. Here, the structural analysis of the haloalkane dehalogenase DpcA isolated from the psychrophilic bacterium Psychrobacter cryohalolentis K5 is presented at the atomic resolution of 1.05 angstrom. This enzyme exhibits a low temperature optimum, making it attractive for environmental applications such as biosensing at the subsurface environment, where the temperature typically does not exceed 25 degrees C. The structure revealed that DpcA possesses the shortest access tunnel and one of the most widely open main tunnels among structural homologs of the HLD-I subfamily. Comparative analysis revealed major differences in the region of the alpha 4 helix of the cap domain, which is one of the key determinants of the anatomy of the tunnels. The crystal structure of DpcA will contribute to better understanding of the structure-function relationships of cold-adapted enzymes.
Permanent Link: http://hdl.handle.net/11104/0297526