Dataset Information

Immunoproteomic analysis of Clostridium botulinum type B secretome for identification of immunogenic proteins against botulism.

ABSTRACT:

Objectives

To identify immunogenic proteins of C. botulinum type B secretome by immunoproteomic analysis.

Results

In the present study, an attempt was made to elucidate the vaccine candidates/diagnostic molecules against botulism using immuno proteomic approach. C. botulinum type B secretome was elucidated when it was grown in TPGY as well as CMM media. Predominant 51 proteins were identified in both the media using 2-DE and mass spectrometry analysis. 2D gels (CMM & TPGY) were probed with respected proteins mice antiserum and obtained 17 and 10 immunogenic proteins in TPGY as well as CMM media respectively. Hypothetical protein CLOSPO_00563, ornithine carbamoyl transferase, FlaA, molecular chaperone GroEL and secreted protease proteins were found as the common immuno dominant proteins in both media. Polyclonal Antibodies raised against C. botulinum types A and E showed cross-reactivity with secretome C. botulinum type B at the lowest dilution (1:1000) but did not show cross reactivity with highest dilution (1:30,000) with C. botulinum type B secretome. Polyclonal antibodies against C. botulinum type F secretome did not show cross reactivity with C. botulinum type B secretome.

Conclusions

Identified immunogenic proteins can be used as vaccine candidates and diagnostic markers for the infant and wound botulism but common immunogenic proteins may be the best vaccine candidate molecule for development of vaccine as well as diagnostic system against the infant and wound botulism.

SUBMITTER: Sharma A

PROVIDER: S-EPMC7904509 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Publications

Immunoproteomic analysis of Clostridium botulinum type B secretome for identification of immunogenic proteins against botulism.

Sharma Arti A Ponmariappan S S Rani Sarita S Alam S I SI Shukla S S

Biotechnology letters 20210225 5

<h4>Objectives</h4>To identify immunogenic proteins of C. botulinum type B secretome by immunoproteomic analysis.<h4>Results</h4>In the present study, an attempt was made to elucidate the vaccine candidates/diagnostic molecules against botulism using immuno proteomic approach. C. botulinum type B secretome was elucidated when it was grown in TPGY as well as CMM media. Predominant 51 proteins were identified in both the media using 2-DE and mass spectrometry analysis. 2D gels (CMM & TPGY) were pr ...[more]

PMID: 33629143

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Project description:BackgroundThe secretion time course of Bacillus anthracis strain RA3R (pXO1+/pXO2-) during early, mid, and late log phase were investigated under conditions that simulate those encountered in the host. All of the identified proteins were analyzed by different software algorithms to characterize their predicted mode of secretion and cellular localization. In addition, immunogenic proteins were identified using sera from humans with cutaneous anthrax.ResultsA total of 275 extracellular proteins were identified by a combination of LC MS/MS and MALDI-TOF MS. All of the identified proteins were analyzed by SignalP, SecretomeP, PSORT, LipoP, TMHMM, and PROSITE to characterize their predicted mode of secretion, cellular localization, and protein domains. Fifty-three proteins were predicted by SignalP to harbor the cleavable N-terminal signal peptides and were therefore secreted via the classical Sec pathway. Twenty-three proteins were predicted by SecretomeP for secretion by the alternative Sec pathway characterized by the lack of typical export signal. In contrast to SignalP and SecretomeP predictions, PSORT predicted 171 extracellular proteins, 7 cell wall-associated proteins, and 6 cytoplasmic proteins. Moreover, 51 proteins were predicted by LipoP to contain putative Sec signal peptides (38 have SpI sites), lipoprotein signal peptides (13 have SpII sites), and N-terminal membrane helices (9 have transmembrane helices). The TMHMM algorithm predicted 25 membrane-associated proteins with one to ten transmembrane helices. Immunogenic proteins were also identified using sera from patients who have recovered from anthrax. The charge variants (83 and 63 kDa) of protective antigen (PA) were the most immunodominant secreted antigens, followed by charge variants of enolase and transketolase.ConclusionThis is the first description of the time course of protein secretion for the pathogen Bacillus anthracis. Time course studies of protein secretion and accumulation may be relevant in elucidation of the progression of pathogenicity, identification of therapeutics and diagnostic markers, and vaccine development. This study also adds to the continuously growing list of identified Bacillus anthracis secretome proteins.

Project description:In a previous comparative proteomic study of Bacillus anthracis examining the influence of the virulence plasmids and of various growth conditions on the composition of the bacterial secretome, we identified 64 abundantly expressed proteins (T. Chitlaru, O. Gat, Y. Gozlan, N. Ariel, and A. Shafferman, J. Bacteriol. 188:3551-3571, 2006). Using a battery of sera from B. anthracis-infected animals, in the present study we demonstrated that 49 of these proteins are immunogenic. Thirty-eight B. anthracis immunogens are documented in this study for the first time. The relative immunogenicities of the 49 secreted proteins appear to span a >10,000-fold range. The proteins eliciting the highest humoral response in the course of infection include, in addition to the well-established immunogens protective antigen (PA), Sap, and EA1, GroEL (BA0267), AhpC (BA0345), MntA (BA3189), HtrA (BA3660), 2,3-cyclic nucleotide diesterase (BA4346), collagen adhesin (BAS5205), an alanine amidase (BA0898), and an endopeptidase (BA1952), as well as three proteins having unknown functions (BA0796, BA0799, and BA0307). Of these 14 highly potent secreted immunogens, 11 are known to be associated with virulence and pathogenicity in B. anthracis or in other bacterial pathogens. Combining the results reported here with the results of a similar study of the membranal proteome of B. anthracis (T. Chitlaru, N. Ariel, A. Zvi, M. Lion, B. Velan, A. Shafferman, and E. Elhanany, Proteomics 4:677-691, 2004) and the results obtained in a functional genomic search for immunogens (O. Gat, H. Grosfeld, N. Ariel, I. Inbar, G. Zaide, Y. Broder, A. Zvi, T. Chitlaru, Z. Altboum, D. Stein, S. Cohen, and A. Shafferman, Infect. Immun. 74:3987-4001, 2006), we generated a list of 84 in vivo-expressed immunogens for future evaluation for vaccine development, diagnostics, and/or therapeutic intervention. In a preliminary study, the efficacies of eight immunogens following DNA immunization of guinea pigs were compared to the efficacy of a PA DNA vaccine. All eight immunogens induced specific high antibody titers comparable to the titers elicited by PA; however, unlike PA, none of them provided protection against a lethal challenge (50 50% lethal doses) of virulent B. anthracis strain Vollum spores.

Dataset Information

Immunoproteomic analysis of Clostridium botulinum type B secretome for identification of immunogenic proteins against botulism.

Objectives

Results

Conclusions

Publications

Immunoproteomic analysis of Clostridium botulinum type B secretome for identification of immunogenic proteins against botulism.

Similar Datasets

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