Regulatory protein E2 (Human papillomavirus type 18) (E2)

The Regulatory protein E2 of Human papillomavirus type 18 (HPV18) is a multifunctional DNA-binding protein essential for the viral life cycle (UniProt [1], PubMed [9]). It acts as a primary regulator of viral transcription, capable of both activating and repressing the expression of viral genes, including the potent oncogenes E6 and E7 (PMC [10], PMC [16]). Beyond transcription, E2 is indispensable for viral DNA replication, where it facilitates the recruitment of the E1 helicase to the viral origin of replication (IntechOpen [7], PMC [8]). It also plays a crucial role in the maintenance and segregation of the viral genome by tethering episomal DNA to host cell chromosomes during mitosis (PMC [12], ResearchGate [11]). In the context of disease, the loss of E2 function—often through the disruption of its gene during viral integration into the host genome—is a hallmark of progression toward cervical cancer, as it removes the transcriptional brake on E6 and E7 (PMC [5], MDPI [15]). Consequently, E2 is a significant therapeutic target; small molecule inhibitors and protein-based agents such as E2R are being developed to disrupt E1-E2 interactions or E2-DNA binding to halt viral replication and potentially restore oncogene repression (PLOS Pathogens [6], Oral Cancer News [14]).

Other names

E2 proteinRegulatory protein E2VE2_HPV18HPV18 E2

Inhibition of E1-E2 protein-protein interaction; Inhibition of E2-DNA binding; Repression of E6/E7 oncogene expression