Expression and serological diagnosis of Mycobacterium tuberculosis CFP-10 and Rv2626c proteins

Area of Science:

• Molecular Biology
• Immunology
• Microbiology

Background:

• Tuberculosis remains a significant global health challenge.
• Accurate and accessible diagnostic methods are crucial for effective control.
• Identifying novel antigens for serological diagnosis is an ongoing research area.

Purpose of the Study:

• To express Mycobacterium tuberculosis CFP-10 and Rv2626c proteins in Escherichia coli.
• To evaluate the immunoreactivity of these recombinant proteins.
• To assess the potential of a combination antigen for tuberculosis serodiagnosis.

Main Methods:

• Gene amplification of CFP-10 and Rv2626c from M. tuberculosis H37Rv.
• Cloning into the PET30a expression vector for E. coli expression.
• Purification of recombinant proteins using histidine tag nickel column chromatography.
• Detection and immunoreactivity assessment via Enzyme-Linked Immunosorbent Assay (ELISA).

Main Results:

• Successful expression of recombinant CFP-10 and Rv2626c proteins, predominantly in soluble form, in E. coli.
• Mixed antigens of recombinant CFP-10 and Rv2626c demonstrated a 77.1% positive rate in ELISA using 214 blood samples.
• The target genes were effectively expressed in the host strain.

Conclusions:

• Recombinant CFP-10 and Rv2626c proteins can be successfully expressed in E. coli.
• A combination antigen of recombinant CFP-10 and Rv2626c shows promise for serological diagnosis of tuberculosis.
• This approach offers potential for developing improved tuberculosis diagnostic tools.