Development of recombinant subunit vaccine targeting InvH protein of Salmonella Typhimurium and evaluation of its immunoprotective efficacy against salmonellosis

• Published in: Brazilian journal of microbiology Vol. 54; no. 4; pp. 3257 - 3264
• Main Authors: Choudhury, Mridusmita, Borah, Probodh, Sarma, Hridip Kumar, Deka, Dipak, Dutta, Rupam, Hazarika, Girin, Deka, Naba Kumar
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.12.2023; Springer Nature B.V
• Subjects: Animal health; Animals; Bacterial Proteins - metabolism; Biomedical and Life Sciences; E coli; Economic impact; Epithelial cells; Epithelium; Escherichia coli - genetics; Food Microbiology; Humans; Immunization; Immunoglobulin G; Life Sciences; Medical Microbiology; Mice; Microbial Ecology; Microbial Genetics and Genomics; Microbiology; Mycology; Proteins; Recombinant Proteins - genetics; Recombinant Proteins - metabolism; Salmonella; Salmonella Food Poisoning; Salmonella Infections - prevention & control; Salmonella Infections, Animal - microbiology; Salmonella Typhimurium; Salmonella typhimurium - genetics; Salmonella typhimurium - metabolism; Salmonellosis; Type III Secretion Systems - metabolism; Vaccines; Vaccines, Attenuated; Vaccines, Subunit - genetics; Vaccines, Subunit - metabolism; Veterinary Microbiology - Research Paper; Vaccine; Typhimurium; Recombinant protein; invH; Salmonella Typhimurium
• ISSN: 1517-8382; 1678-4405; 1678-4405
• DOI: 10.1007/s42770-023-01136-6

Salmonella Typhimurium is the most prevalent non-host specific Salmonella serovars and a major concern for both human and animal health systems worldwide contributing to significant economic loss. Type 3 secretion system (T3SS) of Salmonella plays an important role in bacterial adherence and entry into the host epithelial cells. The product of invH gene of Salmonella is an important component of the needle complex of the type 3 secretion system. Hence, the present study was undertaken to clone and express the 15 kDa InvH surface protein of Salmonella Typhimurium in an E. coli host and to evaluate its immune potency in mice. The purified recombinant InvH (r-InvH) protein provoked a significant ( p  < 0.01) rise in IgG in the inoculated mice. The immunized mice were completely (100%) protected against the challenge dose of 107.5 LD50, while protection against challenge with the same dose of heterologous serovars was 90%. The bacterin-vaccinated group showed homologous protection of 60% against all three serovars. Findings in this study suggest the potential of the r-InvH protein of S . Typhimurium as an effective vaccine candidate against Salmonella infections.