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Multistep conversion of cresols by phenol hydroxylase and 2,3-dihydroxy-biphenyl 1,2-dioxygenase |
Shengnan SHI1,Fang MA1,*(),Tieheng SUN1,Ang LI1,Jiti ZHOU2,Yuanyuan QU2,*() |
1. State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 2. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China |
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Abstract A multistep conversion system composed of phenol hydroxylase (PHIND) and 2,3-dihydroxy-biphenyl 1,2-dioxygenase (BphCLA-4) was used to synthesize methylcatechols and semialdehydes from o- and m-cresol for the first time. Docking studies displayed by PyMOL predicted that cresols and methylcatechols could be theoretically transformed by this multistep conversion system. High performance liquid chromatography mass spectrometry (HPLC-MS) analysis also indicated that the products formed from multistep conversion were the corresponding 3-methylcatechol, 4-methylcatechol, 2-hydroxy-3-methyl-6-oxohexa-2,4-dienoic acid (2-hydroxy-3-methyl-ODA) and 2-hydroxy-5-methyl-6-oxohexa-2,4-dienoic acid (2-hydroxy-5-methyl-ODA). The optimal cell concentrations of the recombinant E. coli strain BL21 (DE3) expressing phenol hydroxylase (PHIND) and 2,3-dihydroxy-biphenyl 1,2-dioxygenase (BphCLA-4) and pH for the multistep conversion of o- and m-cresol were 4.0 (g·L-1 cell dry weight) and pH 8.0, respectively. For the first step conversion, the formation rate of 3-methylcatechol (0.29 μmol·L-1·min-1·mg-1 cell dry weight) from o-cresol was similarly with that of methylcatechols (0.28 μmol·L-1·min-1·mg-1 cell dry weight) from m-cresol by strain PHIND. For the second step conversion, strain BphCLA-4 showed higher formation rate (0.83 μmol·L-1·min-1·mg-1 cell dry weight) for 2-hydroxy-3-methyl-ODA and 2-hydroxy-5-methyl-ODA from m-cresol, which was 1.1-fold higher than that for 2-hydroxy-3-methyl-ODA (0.77 μmol·L-1·min-1·mg-1cell dry weight) from o-cresol. The present study suggested the potential application of the multistep conversion system for the production of chemical synthons and high-value products.
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Keywords
multistep conversion
cresols
phenol hydroxylase
2
3-dihydroxybiphenyl 1
2-dioxygenase
methylcatechols
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Corresponding Author(s):
Fang MA
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Issue Date: 11 June 2014
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