Efficiently cleaved HIV-1 envelopes: can they be important for vaccine immunogen development?

Area of Science:

• Immunology
• Virology
• Vaccine Development

Background:

• HIV-1's extensive diversity complicates the selection of suitable envelope (Env) proteins for vaccine immunogens.
• Despite advances in creating soluble, trimeric Env proteins, few have successfully elicited neutralizing antibodies (Abs) in animal models.

Purpose of the Study:

• To explore strategies for selecting naturally occurring HIV-1 Envs for vaccine immunogen design.
• To investigate the correlation between efficient cell surface cleavage and selective binding to broadly neutralizing antibodies (bNAbs).

Main Methods:

• Discussing challenges in HIV-1 vaccine development and soluble immunogen generation.
• Analyzing naturally occurring, membrane-bound, efficiently cleaved Envs for their potential in immunogen design.

Main Results:

• Efficient cleavage of Envs may increase the pool of suitable candidates for vaccine immunogen design.
• Challenges remain in developing well-folded, native-like trimers and other immunogen strategies like virus-like particles.

Conclusions:

• Efficiently cleaved HIV-1 Envs warrant further study to enhance vaccine immunogen design.
• An immunogen eliciting broadly potent neutralizing antibodies for HIV-1 vaccines has yet to be developed.