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Crystal structure of the haloalkane dehalogenase from Sphingomonas paucimobilis UT26

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MAREK Jaromír VÉVODOVÁ Jitka KUTÁ-SMATANOVÁ Ivana NAGATA Y. SVENSSON L.A. NEWMAN J. TAKAGI M. DAMBORSKÝ Jiří

Rok publikování 2000
Druh Článek v odborném periodiku
Časopis / Zdroj Biochemistry
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://www.ncbr.chemi.muni.cz/~jiri/ABSTRACTS/biochem00.html
Obor Biochemie
Klíčová slova Crystal structure; haloalkane dehalogenase
Popis The haloalkane dehalogenase from Sphingomonas paucimobilis UT26 (LinB) is the enzyme involved in the degradation ofthe important environmental pollutant g-hexachlorocyclohexane. The enzyme hydrolyzes a broad range of halogenated cyclic and aliphatic compounds. Here, we present the 1.58 A crystal structure of LinB and the 2.0 A structure of LinB with 1,3-propanediol, a product of debromination of 1,3-dibromopropane, in the active site of the enzyme. The enzyme belongs to the a/b-hydrolase family and contains a catalytic triad (Aspl08, His272, and Glu132) in the lipase-like topological arrangement previously proposed from mutagenesis experiments. The LinB structure was compared with the structures of haloalkane dehalogenase from Xanthobacter autotrophicus GJl0 and from Rhodococcus sp. and the structural features involved in the adaptation toward xenobiotic substrates were identified. The arrangement and composition of the a-helices in the cap domain results in the dif ferences in the size and shape of the active-site cavity and the entrance tunnel. This is the major determinant ofthe substrate specificity ofthis haloalkane dehalogenase.
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