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Volume 31, Issue 9
  • ISSN: 0929-8665
  • E-ISSN: 1875-5305

Abstract

Aim

To study the inhibition potential of antibody against a recombinant chimera comprising of the catalytic epitope of gp63 of and B subunit of heat-labile enterotoxin (LTB) in the functional activity of L. donovani.

Background

Visceral leishmaniasis, caused by the protozoan parasite , is a major health problem and causes mortality in tropical regions. Protozoan proteases play a crucial role in the pathogenesis of the disease and in establishing infection by countering the host's innate immune responses, namely complement-mediated lysis and phagocytosis. A surface-bound metalloprotease (gp63) has been reported to be a major virulence factor resulting in the evasion of complement-mediated lysis, cleaving host extracellular and intracellular substrates, resulting in intra-phagolysosomal survival.

Methods

The epitope corresponding to the catalytic motif of gp63 of was fused with the B subunit of heat-labile enterotoxin, which is known to be immunogenic. The chimera was cloned to a prokaryotic expression vector and purified using Ni NTA affinity chromatography. Antibodies were generated against the purified fusion protein and analyzed for its ability to bind to the gp63 catalytic motif peptide by ELISA. The effect of fusion protein antibody on the functional activity of gp63 was evaluated by assessing the effect of purified IgGs on the protease activity and complement-mediated lysis of promastigotes

Results

The present study reports that a recombinant chimera of the catalytic epitope of gp63 and B subunit of heat-labile enterotoxin (LTB) of , a potent adjuvant of humoral response can mount significant immune response towards the catalytic epitope. ELISA and Western blot analysis showed that the anti-fusion protein antiserum could recognize the native gp63. Also, it significantly inhibited the protease activity of promastigotes and subsequently increased complement-mediated lysis of the promastigotes .

Conclusion

It could be concluded that the hybrid protein containing catalytic motif L. donovani gp63 protein and carrier protein (LTB) could elicit antibodies that could neutralise the functional activity of gp63 and thus could be a potential candidate for subunit leishmaniasis vaccine.

© 2024 Bentham Science Publishers
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2024-09-19
2024-12-23

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/content/journals/ppl/10.2174/0109298665325330240828115712
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Immunogenicity and Neutralization Potential of Recombinant Chimeric Protein Comprising the Catalytic Region of Gp63 of Leishmania and LTB against Leishmania donovani
PPL 31, 696 (2024); https://doi.org/10.2174/0109298665325330240828115712
/content/journals/ppl/10.2174/0109298665325330240828115712
/content/journals/ppl/10.2174/0109298665325330240828115712
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  • Article Type:     Research Article
Keyword(s): complement-mediated lysis; fusion protein; gp63; heat-labile enterotoxin; Leishmania; zinc metalloprotease

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