The human cytomegalovirus 86-kilodalton major immediate-early protein interacts physically and functionally with...

Area of Science:

• Molecular Virology
• Epigenetics
• Gene Regulation

Background:

• Human cytomegalovirus (HCMV) major immediate-early protein 86 (IE86) is crucial for controlling viral and cellular gene expression.
• IE86 functions as a multimodal transcription factor, autoregulating its promoter and activating viral early genes.
• IE86 is known to promiscuously regulate cellular genes, but the mechanisms are not fully understood.

Purpose of the Study:

• To investigate the interaction of HCMV IE86 with host cell factors during productive infection.
• To determine if IE86 interacts with histone acetyltransferases (HATs).
• To elucidate the functional consequences of IE86-HAT interactions on viral gene transcription.

Main Methods:

• Co-immunoprecipitation assays to detect protein-protein interactions between IE86 and host factors.
• Reporter gene assays to measure the transactivation activity of IE86 on viral promoters.
• Analysis of IE86 interactions with specific HATs, including CBP-associated factor (P/CAF).

Main Results:

• HCMV IE86 directly interacts with histone acetyltransferases during infection.
• The histone acetyltransferase CBP-associated factor (P/CAF) is one of the interacting factors.
• This interaction leads to synergistic transactivation of IE86-responsive promoters.

Conclusions:

• HCMV IE86 recruits chromatin-remodeling factors, specifically histone acetyltransferases like P/CAF, to viral promoters.
• This recruitment mechanism contributes to IE86's ability to act as a promiscuous transactivator of cellular genes.
• Understanding IE86-HAT interactions provides insights into HCMV-mediated gene dysregulation.