Journal
JOURNAL OF IMMUNOLOGICAL METHODS
Volume 394, Issue 1-2, Pages 10-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jim.2013.04.010
Keywords
Chaperones; Bacteria; Cytoplasm; Phage display
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Improper protein folding or aggregation can frequently be responsible for low expression and poor functional activity of antibody fragments secreted into the Escherichia coli periplasm. Expression issues also can affect selection of antibody candidates from phage libraries, since antibody fragments displayed on phage also are secreted into the E. coli periplasm. To improve secretion of properly folded antibody fragments into the periplasm, we have developed a novel approach that involves co-expressing the antibody fragments with the peptidyl prolyl cis-trans isomerase, FkpA, lacking its signal sequence (cytFkpA) which consequently is expressed in the E. coli cytosol. Cytoplasmic expression of cytFkpA improved secretion of functional Fab fragments into the periplasm, exceeding even the benefits from co-expressing Fab fragments with native, FkpA localized in the periplasm. In addition, panning and subsequent screening of large Fab and scFv naive phage libraries in the presence of cytFkpA significantly increased the number of unique clones selected, as well as their functional expression levels and diversity. (c) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
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