Guanylate-binding proteins in virus infection.

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• Guanylate-binding proteins (GBPs) are interferon-induced GTPases with established roles in anti-microbial functions and tumor suppression.
• While their roles in bacterial infections and inflammasome activation are known, their functions in viral infections are less understood and are an active area of research.

Purpose of the Study:

• To review the emerging and multifaceted roles of Guanylate-binding proteins (GBPs) in the context of viral infections.
• To discuss the diverse antiviral mechanisms employed by GBPs, including inhibition of viral replication and protein degradation.
• To highlight the complex interplay between viral proteins and GBPs, including viral antagonism of GBP functions.

Main Methods:

• Literature review of existing studies on Guanylate-binding proteins (GBPs) and viral infections.
• Analysis of reported mechanisms of GBP action against viruses.
• Discussion of conflicting reports on GBP roles in interferon and inflammation during viral pathogenesis.

Main Results:

• GBPs exhibit diverse antiviral functions, acting through mechanisms dependent on or independent of GTP binding/hydrolysis and isoprenylation.
• Documented antiviral roles include inhibition of viral RNA/protein synthesis, blocking glycoprotein processing, and promoting viral protein degradation.
• Viral proteins have been shown to interact with and antagonize specific GBPs, complicating their antiviral effects.

Conclusions:

• The functions of Guanylate-binding proteins (GBPs) in viral infections are complex and varied, presenting both pro-viral and anti-viral activities.
• Further research is needed to fully elucidate the precise mechanisms and functional implications of GBP recruitment to viral replication complexes.
• Understanding GBP-virus interactions is critical for developing novel antiviral strategies targeting these immune GTPases.