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Purification, gene cloning, and characterization of a novel halohydrin dehalogenase from Agromyces mediolanus ZJB120203.
- Source :
-
Applied biochemistry and biotechnology [Appl Biochem Biotechnol] 2014 Sep; Vol. 174 (1), pp. 352-64. Date of Electronic Publication: 2014 Jul 29. - Publication Year :
- 2014
-
Abstract
- A novel halohydrin dehalogenase (HHDH), catalyzing the transformation of 1,3-dichloro-2-propanol (1,3-DCP) to epichlorohydrin (ECH), was purified from Agromyces mediolanus ZJB120203. The molecular mass of the enzyme was estimated to be 28 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). A 735-bp nucleotide fragment was obtained based on the N-terminal and internal amino acid sequences of the purified HHDH. The gene codes a protein sequence with 244 amino acid residues, and the protein sequence shows high similarity to Hhe AAD2 (HHDH from Arthrobacter sp. AD2), defined as Hhe AAm, which is the seventh reported HHDH. Expression of Hhe AAm was carried out in Escherichia coli and purification was performed by nickel-affinity chromatography. The recombinant HheAAm possessed an optimal pH of 8.5 and an optimal temperature of 50 °C and manifested a K m of 4.58 mM and a V max of 3.84 μmol/min(/)mg. The activity of Hhe AAm was not significantly affected by metal ions such as Zn(2+), Ca(2+), Cu(2+), and EDTA, but was strongly inhibited by Hg(2+) and Ag(+). In particular, the Hhe AAm exhibits an enantioselectivity for the conversion of prochiral 1,3-DCP to (S)-ECH. The applications of the Hhe AAm as a catalyst for asymmetric synthesis are promising.
- Subjects :
- Cloning, Molecular
Recombinant Proteins biosynthesis
Recombinant Proteins chemistry
Recombinant Proteins genetics
Recombinant Proteins isolation & purification
Actinobacteria enzymology
Actinobacteria genetics
Bacterial Proteins biosynthesis
Bacterial Proteins chemistry
Bacterial Proteins genetics
Bacterial Proteins isolation & purification
Hydrolases biosynthesis
Hydrolases chemistry
Hydrolases genetics
Hydrolases isolation & purification
Subjects
Details
- Language :
- English
- ISSN :
- 1559-0291
- Volume :
- 174
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Applied biochemistry and biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 25069405
- Full Text :
- https://doi.org/10.1007/s12010-014-1111-z