The HIV-1 Tat team gets bigger.

Area of Science:

• Molecular biology
• Virology
• Epigenetics

Background:

• HIV-1 gene expression relies on RNA polymerase II and viral Tat protein.
• Tat recruits cellular cofactors for productive viral transcription.

Discussion:

• The lysine methyltransferase Set7/9 (KMT7) interacts with HIV-1 Tat.
• Set7/9 enhances Tat's ability to stimulate RNA polymerase II elongation.
• Set7/9 also methylates Tat, further boosting its function.

Key Insights:

• Set7/9-KMT7 is a novel cofactor that promotes HIV-1 transcription.
• Tat methylation by Set7/9 is a key mechanism for enhancing viral gene expression.

Outlook:

• Targeting the Set7/9-Tat interaction could be a new antiviral strategy.
• Understanding Set7/9's role may reveal new insights into viral latency and reactivation.