Download MendeleyDeciphering the Structural Basis of High Thermostability of Dehalogenase from Psychrophilic BacteriumMarinobactersp. ELB17.
Chrast, L., Tratsiak, K., Planas-Iglesias, J., Daniel, L., Prudnikova, T., Brezovsky, J., Bednar, D., Kuta Smatanova, I., Chaloupkova, R., Damborsky, J.(2019) Microorganisms 7
- PubMed: 31661858
- DOI: https://doi.org/10.3390/microorganisms7110498
- Primary Citation of Related Structures:
5MXP - PubMed Abstract:
Haloalkane dehalogenases are enzymes with a broad application potential in biocatalysis, bioremediation, biosensing and cell imaging. The new haloalkane dehalogenase DmxA originating from the psychrophilic bacterium Marinobacter sp. ELB17 surprisingly possesses the highest thermal stability (apparent melting temperature T m,app = 65.9 °C) of all biochemically characterized wild type haloalkane dehalogenases belonging to subfamily II. The enzyme was successfully expressed and its crystal structure was solved at 1.45 Å resolution. DmxA structure contains several features distinct from known members of haloalkane dehalogenase family: (i) a unique composition of catalytic residues; (ii) a dimeric state mediated by a disulfide bridge; and (iii) narrow tunnels connecting the enzyme active site with the surrounding solvent. The importance of narrow tunnels in such paradoxically high stability of DmxA enzyme was confirmed by computational protein design and mutagenesis experiments.
Organizational Affiliation:
Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/A13, 625 00 Brno, Czech Republic. lukchrast@gmail.com.
