Heterologous expression and characterization of a recombinant thermostable alkylsulfatase (<Emphasis Type="Italic">sdsAP</Emphasis>) |
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Authors: | Mengxian Long Lingwei Ruan Fuying Li Ziniu Yu Xun Xu |
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Institution: | (1) State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, 430070 Wuhan, Hubei, People’s Republic of China;(2) Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), No. 178 Daxue Road, 361005 Xiamen, People’s Republic of China |
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Abstract: | A novel alkylsulfatase gene, sdsAP, was cloned from a newly isolated bacterium Pseudomonas sp. S9. It encoded a protein of 675 amino acids with a calculated molecular mass of 74.9 kDa. The protein contained a typical
N-terminal signal peptide of 41 amino acid residues, followed by a metallo-β-lactamase like domain at the N-terminus and a
SCP-2-like domain at the C-terminus. This domain organization mode suggested that it belonged to the type III sulfatase. The
mature alkylsulfatase was overexpressed in Escherichia coli. The optimal temperature and pH of the recombinant SdsAP were 70°C and 9.0, respectively. Notably, at optimal conditions,
the purified recombinant SdsAP had a high specific activity of 23.25 μmol min−1 mg−1, a K
m (app) of 264.3 μmol, and a V
max (app) of 33.8 μmol min−1 mg−1 for SDS. Additionally, it still retained more than 90% activity after incubation at 65°C for 1 h, which was much different
from other alkylsulfatases reported. The recombinant enzyme hydrolyzed the primary alkyl sulfate such as sodium octyl sulfate
and sodium dodecyl sulfate (SDS). It was a Zn2+-containing and Ca2+ activated alkylsulfatase. This is the first report to explore the various characteristics of the heterologous recombinant
alkylsulfatase in details. These favorable properties could make SdsAP attractive to be useful in the degradation of SDS-containing
waste. |
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Keywords: | |
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