PIMT/TGS1: An evolving metabolic molecular switch with conserved methyl transferase activity.

Area of Science:

• Molecular Biology
• Gene Regulation
• Biochemistry

Background:

• Transcriptional coactivators are key regulators of gene expression.
• PRIP interacting protein (PIMT), also known as trimethyl guanosine synthase 1 (TGS1), possesses an RNA methyl transferase domain.
• PIMT acts as a bridge between different coactivator types, influencing gene expression.

Purpose of the Study:

• To comprehensively review the multifaceted roles of PIMT.
• To highlight PIMT's function as both a coactivator and a methyltransferase.
• To explore PIMT's potential as a therapeutic target for metabolic disorders.

Main Methods:

• Literature review of studies on PIMT function.
• Analysis of PIMT's involvement in gene expression pathways.
• Examination of PIMT's role in metabolic regulation and disease.

Main Results:

• PIMT disruption leads to embryonic lethality, underscoring its essentiality.
• PIMT regulates hepatic gluconeogenesis and insulin resistance.
• PIMT's methyltransferase activity is critical for HIV-1 post-transcriptional regulation and telomerase RNA biogenesis.

Conclusions:

• PIMT exhibits a dual role, functioning in both transcriptional coactivation and RNA methylation.
• Its critical functions in development and metabolism suggest significant biological importance.
• PIMT represents a promising therapeutic target for metabolic disorders.