Secretory expression and purification of recombinant Escherichia coli heat-labile enterotoxin B subunit and its applications on intranasal vaccination of hantavirus.

Abstract:

:In order to further study the B subunit of the Escherichia coli heat-labile enterotoxin (LTB), we obtained the LTB gene from pathogenic E. coli, cloned it into the pET22b (+) prokaryotic expression vector, and expressed it as a fusion protein with His tag in E. coli BL21 (DE3). The recombinant LTB was expressed and purified by Ni2+ affinity chromatography. The biological activity of the purified recombinant LTB was assayed in a series of monosialotetrahexosylganglioside (GM1)-ELISA experiments. The recombinant LTB (rLTB) was efficiently expressed under the induction of 10 g/l lactose at 37 degrees C for 6 h and yielded up to 31% of the total bacterial protein. Fused with pelB signal peptide, rLTB was successfully localized to the periplasmic space. GM1-ELISA experiments showed that the rLTB obtained retains strong GM1 ganglioside-binding activity. The ELISA result of hantavirus nucleoprotein-specific secretory immunoglobulin A (sIgA) and IgG showed that intranasal administration of inactivated hantavirus with rLTB significantly increased the levels of hantavirus-specific sIgA (P<0.01) and IgG (P<0.01) in comparison with inactivated hatavirus alone. In summary, we have developed a method for the efficient secretory expression and purification of rLTB, and the inactivated hantavirus co-administered intranasally with rLTB could effectively induce both mucosal and humoral immune responses specific to hantavirus.

journal_name

Mol Biotechnol

journal_title

Molecular biotechnology

authors

Cao S,Zhang Y,Liu F,Wang Q,Zhang Q,Liu Q,Li C,Liang M,Li D

doi

10.1007/s12033-008-9101-4

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

91-8

issue

2

eissn

1073-6085

issn

1559-0305

journal_volume

41

pub_type

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