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Marchetti R, Dillon MJ, Burtnick MN, Hubbard MA, Kenfack MT, Blériot Y, Gauthier C, Brett PJ, AuCoin DP, Lanzetta R, Silipo A, Molinaro A. Burkholderia pseudomallei Capsular Polysaccharide Recognition by a Monoclonal Antibody Reveals Key Details toward a Biodefense Vaccine and Diagnostics against Melioidosis. ACS Chem Biol 2015. [PMID: 26198038 DOI: 10.1021/acschembio.5b00502] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Burkholderia pseudomallei is the bacterium responsible for melioidosis, an infectious disease with high mortality rates. Since melioidosis is a significant public health concern in endemic regions and the organism is currently classified as a potential biothreat agent, the development of effective vaccines and rapid diagnostics is a priority. The capsular polysaccharide (CPS) expressed by B. pseudomallei is a highly conserved virulence factor and a protective antigen. Because of this, CPS is considered an attractive antigen for use in the development of both vaccines and diagnostics. In the present study, we describe the interactions of CPS with the murine monoclonal antibody (mAb) 4C4 using a multidisciplinary approach including organic synthesis, molecular biology techniques, surface plasmon resonance, and nuclear magnetic spectroscopy. Using these methods, we determined the mode of binding between mAb 4C4 and native CPS or ad hoc synthesized capsular polysaccharide fragments. Interestingly, we demonstrated that the O-acetyl moiety of CPS is essential for the interaction of the CPS epitope with mAb 4C4. Collectively, our results provide important insights into the structural features of B. pseudomallei CPS that enable antibody recognition that may help the rational design of CPS-based vaccine candidates. In addition, our findings confirm that the mAb 4C4 is suitable for use in an antibody-based detection assay for diagnosis of B. pseudomallei infections.
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Affiliation(s)
- Roberta Marchetti
- Department
of Chemical Sciences, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, I-80126, Naples, Italy
| | - Michael J. Dillon
- Department
of Microbiology and Immunology, University of Nevada School of Medicine, Reno, Nevada 89557, United States
| | - Mary N. Burtnick
- Department
of Microbiology and Immunology, University of South Alabama, Mobile, Alabama 36688, United States
| | - Mark A. Hubbard
- Department
of Microbiology and Immunology, University of Nevada School of Medicine, Reno, Nevada 89557, United States
| | - Marielle Tamigney Kenfack
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR 7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex-9, France
| | - Yves Blériot
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR 7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex-9, France
| | - Charles Gauthier
- Université de Poitiers, Institut de Chimie IC2MP, CNRS-UMR 7285, Équipe Synthèse Organique, 4 rue Michel Brunet, 86073 Poitiers Cedex-9, France
| | - Paul J. Brett
- Department
of Microbiology and Immunology, University of South Alabama, Mobile, Alabama 36688, United States
| | - David P. AuCoin
- Department
of Microbiology and Immunology, University of Nevada School of Medicine, Reno, Nevada 89557, United States
| | - Rosa Lanzetta
- Department
of Chemical Sciences, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, I-80126, Naples, Italy
| | - Alba Silipo
- Department
of Chemical Sciences, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, I-80126, Naples, Italy
| | - Antonio Molinaro
- Department
of Chemical Sciences, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, I-80126, Naples, Italy
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