title: Computational Identification and Characterization of a Promiscuous T-Cell Epitope on the Extracellular Protein 85B ofMycobacteriumspp. for Peptide-Based Subunit Vaccine Design.
abstract: Tuberculosis (TB) is a reemerging disease that remains as a leading cause of morbidity and mortality in humans. To identify and characterize a T-cell epitope suitable for vaccine design, we have utilized the Vaxign server to assess all antigenic proteins ofMycobacteriumspp. recorded to date in the Protegen database. We found that the extracellular protein 85B displayed the most robust antigenicity among the proteins identified. Computational tools for identifying T-cell epitopes predicted an epitope, 181-QQFIYAGSLSALLDP-195, that could bind to at least 13 major histocompatibility complexes, revealing the promiscuous nature of the epitope. Molecular docking simulation demonstrated that the epitope could bind to the binding groove of MHC II and MHC I molecules by several hydrogen bonds. Molecular docking analysis further revealed that the epitope had a distinctive binding pattern to all DRB1 and A and B series of MHC molecules and presented almost no polymorphism in its binding site. Moreover, using "Allele Frequency Database," we checked the frequency of HLA alleles in the worldwide population and found a higher frequency of both class I and II HLA alleles in individuals living in TB-endemic regions. Our results indicate that the identified peptide might be a universal candidate to produce an efficient epitope-based vaccine for TB.
authors.affiliation: Department of Biotechnology, Faculty of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; Department of Genetic Engineering & Biotechnology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh.
authors.forename: Md Saddam
authors.initials: MS
authors.lastname: Hossain
authors.affiliation: Department of Genetic Engineering & Biotechnology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh.
authors.forename: Abul Kalam
authors.identifier: 0000-0003-1918-3268
authors.initials: AK
authors.lastname: Azad
authors.affiliation: Department of Dermatology, Sylhet Women's Medical College, Sylhet 3114, Bangladesh.
authors.forename: Parveen Afroz
authors.initials: PA
authors.lastname: Chowdhury
authors.affiliation: Department of Biotechnology, Faculty of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
authors.forename: Mamoru
authors.initials: M
authors.lastname: Wakayama
mesh_terms: D000595:Amino Acid Sequence; D000942:Antigens, Bacterial / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D019295:Computational Biology; D018984:Epitopes, T-Lymphocyte / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D062105:Molecular Docking Simulation; D009169:Mycobacterium tuberculosis / Q000276:immunology* / Q000472:pathogenicity; D010455:Peptides / Q000276:immunology / Q000627:therapeutic use; D014376:Tuberculosis / Q000276:immunology* / Q000517:prevention & control; D032581:Tuberculosis Vaccines / Q000276:immunology / Q000627:therapeutic use; D022223:Vaccines, Subunit / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D018984:Epitopes, T-Lymphocyte; D010455:Peptides; D032581:Tuberculosis Vaccines; D022223:Vaccines, Subunit