title: Transesterification of plant oils using Staphylococcus haemolyticus L62 lipase displayed on Escherichia coli cell surface using the OmpA signal peptide and EstAβ8 anchoring motif.
abstract: Staphylococcus haemolyticus L62 (SHL62) lipase was displayed on the outer membrane of Escherichia coli using the OmpA signal peptide and the autotransporter EstAβ8 protein. Localization of SHL62 lipase on the outer membrane of E. coli was confirmed using immunofluorescence microscopy and flow cytometry analysis. Lipase activity of the displayed SHL62 lipase was also measured using spectrophotometry and pH titration. SHL62 lipase activity of whole cells reached 2.0U/ml culture (OD600nm of 10) when it was measured by the p-nitrophenyl caprylate assay after being induced with 1mM IPTG for 24h. The optimum temperature and pH for the lipase was 45°C and 10, respectively. Furthermore, it maintained more than 90% of maximum lipase activity at up to 50°C and in a pH range of 5-9. The hydrolytic activity assay conduted with various substrates confirmed that p-nitrophenyl caprylate and corn oil were preferred substrates among various synthetic and natural substrates, respectively. The displayed SHL62 lipase produced fatty acid esters from various alcohols and plant oils through transesterification.
authors.affiliation: Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi 420-743, Republic of Korea.
authors.forename: Jin Chul
authors.initials: JC
authors.lastname: Jo
authors.affiliation: Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi 420-743, Republic of Korea.
authors.forename: Soon-Ja
authors.initials: SJ
authors.lastname: Kim
authors.affiliation: Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi 420-743, Republic of Korea. Electronic address: hkkim@catholic.ac.kr.
authors.forename: Hyung Kwoun
authors.initials: HK
authors.lastname: Kim
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001709:Biotechnology; D002265:Carboxylic Ester Hydrolases / Q000235:genetics / Q000378:metabolism*; D002462:Cell Membrane / Q000201:enzymology; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D004951:Esterification; D005227:Fatty Acids / Q000378:metabolism; D008049:Lipase / Q000235:genetics / Q000378:metabolism*; D010938:Plant Oils / Q000378:metabolism*; D021382:Protein Sorting Signals / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D041162:Staphylococcus haemolyticus / Q000201:enzymology* / Q000235:genetics; D013379:Substrate Specificity
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D005227:Fatty Acids; D010938:Plant Oils; D021382:Protein Sorting Signals; D011994:Recombinant Proteins; C078167:OMPA outer membrane proteins; D002265:Carboxylic Ester Hydrolases; C098953:EstA protein, bacteria; D008049:Lipase
keywords: EstAβ8; Lipase; Staphylococcus haemolyticus; Surface display; Transesterification