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 Tm,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.

Enantis Ltd Biotechnology Incubator INBIT Kamenice 771 34 625 00 Brno Czech Republic

Institute of Chemistry and Biochemistry Faculty of Science University of South Bohemia Ceske Budejovice and Institute of Microbiology Academy of Sciences of the Czech Republic Branisovska 1760 370 05 Ceske Budejovice Czech Republic

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences v v i Flemingovo nam 2 166 10 Prague 6 Czech Republic

International Clinical Research Center St Anne's University Hospital Pekarska 53 656 91 Brno Czech Republic

Loschmidt Laboratories Department of Experimental Biology and RECETOX Faculty of Science Masaryk University Kamenice 5 A13 625 00 Brno Czech Republic

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