Structure based sequence analysis & epitope prediction of gp41 HIV1 envelope glycoprotein isolated in Pakistan

Area of Science:

• Virology
• Immunology
• Bioinformatics

Background:

• Human immune deficiency virus (HIV) infection is a global health concern, with over 80,000 cases in Pakistan.
• The gp41 envelope glycoprotein plays a crucial role in HIV entry into host cells.
• Understanding HIV gp41 epitopes is vital for developing effective diagnostics and vaccines.

Purpose of the Study:

• To analyze HIV gp41 protein sequences from Pakistan.
• To identify conserved regions and potential T cell binding epitopes within the gp41 protein.
• To explore the potential of these epitopes as vaccine candidates against HIV subtype a.

Main Methods:

• Utilized immunoinformatics tools and computational software for sequence analysis.
• Aligned approximately 90 gp41 sequences of Pakistani origin to identify variable and conserved regions.
• Applied methods including secondary structure analysis, surface accessibility, hydrophobicity, antigenicity, and molecular docking for epitope prediction.

Main Results:

• Identified four conserved segments within the HIV gp41 protein.
• Predicted several highly conserved CD4 and CD8 T cell binding epitopes, primarily in regions 1-12, 14-22, and 25-46.
• These conserved epitopes showed potential as effective vaccine candidates.

Conclusions:

• The study identified potential cytotoxic T cell (CTL) epitopes derived from HIV subtype a in Pakistani isolates.
• Conserved epitopes are valuable for diagnosing HIV-1 subtype a.
• Findings support further research into developing vaccines against HIV-1 subtype a prevalent in Pakistan.