Publication details

Deciphering the Structural Basis of High Thermostability of Dehalogenase from Psychrophilic Bacterium Marinobacter sp. ELB17

Authors

CHRÁST Lukáš TRATSIAK K. PLANAS IGLESIAS Joan DANIEL Lukáš PRUDNIKOVA T. BREZOVSKÝ Jan BEDNÁŘ David SMATANOVA I.K. CHALOUPKOVÁ Radka DAMBORSKÝ Jiří

Year of publication 2019
Type Article in Periodical
Magazine / Source Microorganisms
MU Faculty or unit

Faculty of Science

Citation
Web https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6920932/
Doi http://dx.doi.org/10.3390/microorganisms7110498
Keywords haloalkane dehalogenase; thermostability; psychrophile; access tunnel; dimer; catalytic pentad; enantiselectivity
Description 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,T-app = 65.9 degrees 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 angstrom 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.
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