Reactome: A Curated Pathway Database

RNA polymerase III transcribes microbial dsDNA to dsRNA

Stable Identifier
Homo sapiens
Locations in the PathwayBrowser

RNA polymerase III (POL III) was reported to sense and transcribe cytosolic AT-rich dsDNA into 5'-triphosphate poly(A-U) RNA in human and mouse cells. This dsRNA ligand in turn activated retinoic acid-inducible gene I (RIG-I) leading to production of type I interferon and activation of the transcription factor NF-kappaB (Chiu YH et al. 2009, Ablasser A et al. 2009). Knockdown of POL III expression by siRNA or inhibition of its enzymatic activity by specific chemical inhibitor ML-60218 prevented IFN beta induction in HEK293 cells stimulated with DNA viruses or poly(dA-dT) (Chiu YH et al. 2009, Ablasser A et al. 2009). Moreover, Pol-III inhibition blocked interferon induction by intracellular Legionella pneumophila bacteria [Chiu YH et al 2009].

This project represents cytosolic RNA polymerase III as a complex comprising 17 subunits, although the precise biochemical composition of the cytosolic holoenzyme complex which specifically recognizes AT-rich DNA is not yet known.

Literature References
Participant Of
This entity is regulated by:
Title Physical Entity Activity
RNA polymerase III activity of RNA Polymerase III Holoenzyme [cytosol] RNA Polymerase III Holoenzyme [cytosol] RNA polymerase III activity (0001056)
Orthologous Events