PelB leader sequence

The pelB leader sequence is a sequence of amino acids which, when attached to a protein, directs the protein to the bacterial periplasm, where the sequence is removed by a signal peptidase.^[1] Specifically, pelB refers to pectate lyase B of Erwinia carotovora CE. The leader sequence consists of the 22 N-terminal amino acid residues. This leader sequence can be attached to any other protein (on the DNA level) resulting in a transfer of such a fused protein to the periplasmic space of Gram-negative bacteria, such as Escherichia coli, often used in genetic engineering. Protein secretion can increase the stability of cloned gene products. For instance it was shown that the half-life of the recombinant proinsulin is increased 10-fold when the protein is secreted to the periplasmic space. (vijji.Narne, R.S.Ramya)

One of pelB's possible applications is to direct coat protein-antigen fusions to the cell surface for the construction of engineered bacteriophages for the purpose of phage display.

References

↑ Sockolosky, J. T; Szoka, F. C (2012). "Periplasmic production via the pET expression system of soluble, bioactive human growth hormone". Protein Expression and Purification. 87 (2): 129–135. doi:10.1016/j.pep.2012.11.002. PMC 3537859.

SP Lei et al., Characterization of the Erwinia carotovora pelB gene and its product pectate lyase. J. Bacteriol. 169(9): 4379–4383 (1987).

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[1] Sockolosky, J. T; Szoka, F. C (2012). "Periplasmic production via the pET expression system of soluble, bioactive human growth hormone". Protein Expression and Purification. 87 (2): 129–135. doi:10.1016/j.pep.2012.11.002. PMC 3537859.