Preparation and Evaluation of T4SS Recombinant Proteins in Serodiagnosis of Human Brucellosis Based on TMT-based Proteomics Technology

Overview

Journal Front Cell Infect Microbiol

Date 2025 Jan 31

PMID 39885966

Authors

Qi Wu

Chen Sun

Liping Guo

Yujia Xie

Jinpeng Zhang

Dehui Yin

Affiliations

Soon will be listed here.

Abstract

Introduction: Brucellosis, a significant zoonotic infectious disease, poses a global health threat. Accurate and efficient diagnosis is crucial for prevention, control, and treatment of brucellosis. VirB proteins, components of the Type IV secretion system (T4SS) in , play a pivotal role in bacterial virulence and pathogenesis but have been understudied for their diagnostic potential.

Methods: Tandem Mass Tag (TMT) proteomics technology was utilized to identify highly expressed VirB proteins from wild-type strains. Recombinant T4SS proteins were prepared, and an indirect ELISA method was established for serological diagnosis of human brucellosis.

Results: Seven T4SS proteins (rVirB3, rVirB4, rVirB9, rBMEII0036, rVirB8, rVirB11, and rVirB10) were expressed used to construct the indirect ELISA method which showed high diagnostic accuracy. Sensitivity and specificity of the proteins exceeded 0.9100 and 0.9167, respectively, demonstrating good performance comparable to traditional LPS and Rose Bengal Ag antigens. Cross-reactivity was observed in a limited number of serum samples from febrile patients without brucellosis.

Conclusions: The study highlights the potential of VirB proteins as novel diagnostic antigens for human brucellosis. Future research can further optimize the use of VirB proteins in diagnostic assays and explore their applications in vaccine development.

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