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Improving the autotransporter‐based surface display of enzymes in Pseudomonas putida KT2440
Author(s) -
Tozakidis Iasson E. P.,
Lüken Lena M.,
Üffing Alina,
Meyers Annika,
Jose Joachim
Publication year - 2020
Publication title -
microbial biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.287
H-Index - 74
ISSN - 1751-7915
DOI - 10.1111/1751-7915.13419
Subject(s) - pseudomonas putida , signal peptide , bacterial outer membrane , biochemistry , secretion , biology , recombinant dna , enzyme , peptide , chemistry , escherichia coli , gene
Summary Pseudomonas putida can be used as a host for the autotransporter‐mediated surface display of enzymes (autodisplay), resulting in whole‐cell biocatalysts with recombinant functionalities on their cell envelope. The efficiency of autotransporter‐mediated secretion depends on the N‐terminal signal peptide as well as on the C‐terminal translocator domain of autotransporter fusion proteins. We set out to optimize autodisplay for P. putida as the host bacterium by comparing different signal peptides and translocator domains for the surface display of an esterase. The translocator domain did not have a considerable effect on the activity of the whole‐cell catalysts. In contrast, by using the signal peptide of the P. putida outer membrane protein OprF, the activity was more than 12‐fold enhanced to 638  mU  ml −1   OD −1 compared with the signal peptide of V. cholerae CtxB (52  mU  ml −1   OD −1 ). This positive effect was confirmed with a β‐glucosidase as a second example enzyme. Here, cells expressing the protein with N‐terminal OprF signal peptide showed more than fourfold higher β‐glucosidase activity (181  mU  ml −1   OD −1 ) than with the CtxB signal peptide (42  mU  ml −1   OD −1 ). SDS ‐ PAGE and flow cytometry analyses indicated that the increased activities correlated with an increased amount of recombinant protein in the outer membrane and a higher number of enzymes detectable on the cell surface.

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