DNA polymerase epsilon 4, accessory subunit (POLE4)

DNA polymerase epsilon 4, accessory subunit (POLE4) is a non-catalytic, histone-fold protein that serves as an accessory component of the DNA polymerase epsilon complex in eukaryotic cells. POLE4 does not have DNA polymerase activity itself but interacts with other histone-fold proteins to bind DNA in a sequence-independent manner and facilitates the structural integrity and function of the DNA polymerase epsilon holoenzyme, which is essential for leading strand DNA synthesis, chromosomal replication, and maintenance of epigenetic marks during cell division. Pathogenic POLE4 gene variants are linked to rare developmental syndromes and may contribute to cancer risk through impaired DNA replication or repair fidelity. The subunit is not known to be directly targeted by approved drugs, but is integral to the enzymatic complex that is a major therapeutic target in oncology and genetics.

Other names

POLE4DNA polymerase epsilon subunit 4DNA polymerase epsilon subunit p12DNA polymerase II subunit 4p12YHHQ1polymerase (DNA) epsilon 4, accessory subunit

Inhibition of DNA replication/polymerase activity (drugs targeting DNA polymerase epsilon would act via inhibition of DNA strand synthesis; POLE4 itself is not the catalytic subunit, so not directly targeted). Disruption of replication complex assembly (possible mechanistic effect if accessory subunit like POLE4 is disrupted; not a classical drug mechanism but a molecular consequence.)