title: Functional fusion mutant of Candida antarctica lipase B (CalB) expressed in Escherichia coli.
abstract: Candida antarctica lipase B (CalB) was functionally expressed in the cytoplasm of Escherichia coli Origami(DE3) with the N-terminus fusion of E. coli endogenous proteins. The previously-identified stress responsive proteins through comparative proteome analyses such as malate dehydrogenase (Mdh), spermidine/putrescine-binding periplasmic protein (PotD), and FKBP-type peptidyl-prolyl cis-trans isomerase (PPIases) (SlyD) dramatically increased the solubility of CalB in E. coli cytoplasm when used as N-terminus fusion partners. We demonstrated that Mdh, PotD, and SlyD were powerful solubility enhancers that presumably facilitated the protein folding of CalB. Moreover, among the various fusion mutants, Mdh-CalB showed the highest hydrolytic activity and was as biologically active as standard CalB. Similarly to the previous report, the electrophoretic properties of CalB indicate that CalB seems to form dimer-based oligomer structures. We evaluated the structural compatibility between the fusion partner protein and CalB, which seems to be of crucial importance upon the bioactive dimer formation of CalB and might affect the substrate accessibility to the enzyme active site, thereby determining the biological activities of the fusion mutants.
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, Anam-Dong 5-1, Sungbuk-Gu, Seoul 136-713, South Korea.
authors.forename: Hyuk-Seong
authors.initials: HS
authors.lastname: Seo
authors.forename: Seong-Eun
authors.initials: SE
authors.lastname: Kim
authors.forename: Kyung-Yeon
authors.initials: KY
authors.lastname: Han
authors.forename: Jin-Seung
authors.initials: JS
authors.lastname: Park
authors.forename: Yong-Hwan
authors.initials: YH
authors.lastname: Kim
authors.forename: Sang Jun
authors.initials: SJ
authors.lastname: Sim
authors.forename: Jeewon
authors.initials: J
authors.lastname: Lee
mesh_terms: D002175:Candida / Q000201:enzymology*; D019281:Dimerization; D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins / Q000235:genetics; D005656:Fungal Proteins; D008049:Lipase / Q000235:genetics*; D008291:Malate Dehydrogenase / Q000235:genetics; D026901:Membrane Transport Proteins / Q000235:genetics; D008958:Models, Molecular; D019696:Peptidylprolyl Isomerase / Q000235:genetics; D033902:Periplasmic Binding Proteins / Q000235:genetics; D011487:Protein Conformation; D017510:Protein Folding; D011993:Recombinant Fusion Proteins / Q000235:genetics*; D012995:Solubility
chemical_list: D029968:Escherichia coli Proteins; D005656:Fungal Proteins; D026901:Membrane Transport Proteins; D033902:Periplasmic Binding Proteins; C099274:PotD protein, E coli; D011993:Recombinant Fusion Proteins; C085606:SlyD protein, E coli; D008291:Malate Dehydrogenase; D008049:Lipase; C431349:lipase B, Candida antarctica; D019696:Peptidylprolyl Isomerase