Abstract
Functional expression of recombinant Pseudozyma antarctica lipase B (PalB) in Escherichia coli was explored. While PalB was stably expressed in the cytoplasm, most of the expressed gene product aggregated in cells as inactive inclusion bodies. In contrast, PalB was extremely unstable when expressed in the periplasm, also leading to poor expression performance. Such unstable PalB can be rescued by coexpression of several periplasmic folding factors, such as DegP, FkpA, DsbA, and DsbC but not cytoplasmic ones. As a result, the performance for functional PalB expression in the periplasm was significantly improved. To our knowledge, this is the first report demonstrating the use of folding factors to rescue the extremely unstable gene product that is otherwise completely degradable.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Cytoplasm / chemistry
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Cytoplasm / genetics
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Cytoplasm / metabolism
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Escherichia coli / chemistry
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Escherichia coli / genetics
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Escherichia coli / metabolism*
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Escherichia coli Proteins / genetics
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Escherichia coli Proteins / metabolism
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Gene Expression Regulation, Bacterial*
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Genetic Engineering*
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Heat-Shock Proteins / genetics
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Heat-Shock Proteins / metabolism
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Lipase / chemistry
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Lipase / genetics
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Lipase / metabolism*
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Membrane Proteins / genetics
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Membrane Proteins / metabolism
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Peptidylprolyl Isomerase / genetics
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Peptidylprolyl Isomerase / metabolism
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Periplasm / chemistry
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Periplasm / genetics
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Periplasm / metabolism*
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Periplasmic Proteins / genetics
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Periplasmic Proteins / metabolism
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Protein Conformation
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Protein Disulfide-Isomerases / genetics
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Protein Disulfide-Isomerases / metabolism
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Protein Folding*
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Serine Endopeptidases / genetics
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Serine Endopeptidases / metabolism
Substances
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Escherichia coli Proteins
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Heat-Shock Proteins
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Membrane Proteins
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Periplasmic Proteins
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Lipase
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DegP protease
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Serine Endopeptidases
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Peptidylprolyl Isomerase
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FkpA protein, E coli
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Protein Disulfide-Isomerases
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dsbA protein, E coli
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dsbC protein, E coli