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A novel cold-active lipase from Psychrobacter sp. ArcL13: geneidentification, expression in E. coli, refolding, and characterization

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Title
A novel cold-active lipase from Psychrobacter sp. ArcL13: geneidentification, expression in E. coli, refolding, and characterization
Other Titles
새로운 Psychrobacter sp. ArcL13 유래 저온활성 지질분해효소: 유전자 분리동정, 대장균에서의 발현, refolding 및 특성 연구
Authors
Koo, Bon-Hun
Yim, Joung Han
Shin, Jong-Suh
Moon, Byung-Hern
Keywords
Psychrobacter sp. ArcL13cold-active lipasegene prospectingrefolding
Issue Date
2016
Citation
Koo, Bon-Hun, et al. 2016. "A novel cold-active lipase from Psychrobacter sp. ArcL13: geneidentification, expression in E. coli, refolding, and characterization". Journal of microbiology, 52: 192-201.
Abstract
Recently, Psychrobacter sp. ArcL13 strain showing the extracellular lipase activity was isolated from the Chuckchi Sea of the Arctic Ocean. However, due to the low expression levels of the enzyme in the natural strain, the production of recombinant lipase is crucial for various applications. Identification of the gene for the enzyme is prerequisite for the production of the recombinant protein. Therefore, in the present study, a novel lipase gene (ArcL13-Lip) was isolated from Psychrobacter sp. ArcL13 strain by gene prospecting using PCR, and its complete nucleotide sequence was determined. Sequence analysis showed that ArcL13-Lip has high amino acid sequence similarity to lipases from bacteria of some Psychrobacter genus (84?90%) despite low nucleotide sequence similarity. The lipase gene was cloned into the bacterial expression plasmid and expressed in E. coli. SDS-PAGE analysis of the cells showed that ArcL13-Lip was expressed as inclusion bodies with a molecular mass of about 35 kDa. Refolding was achieved by diluting the unfolded protein into refolding buffers containing various additives, and the highest refolding efficiency was seen in the glucose-containing buffer. Refolded ArcL13-Lip showed high hydrolytic activity toward p-nitrophenyl caprylate and p-nitrophenyl decanoate among different p-nitrophenyl esters. Recombinant ArcL13-Lip displayed maximal activity at 40°C and pH 8.0 with p-nitrophenyl caprylate as a substrate. Activity assays performed at various temperatures showed that ArcL13-Lip is a cold-active lipase with about 40% and 73% of enzymatic activity at 10°C and 20°C, respectively, compared to its maximal activity at 40°C.
URI
https://repository.kopri.re.kr/handle/201206/7512
DOI
http://dx.doi.org/10.7845/kjm.2016.6029
Type
Article
Indexed
KCI등재
Appears in Collections  
2016-2016, Development of Useful Metabolites from Polar Organisms (16) / Yim; Joung Han (PE16350)
2011-2016, Exploration of Future Resources in The Polar Oceans and Study on Their Utilization (K-POD) (11-16) / Yim; Joung Han (PM11090; PM12030; PM13030; PM14050; PM15050)
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