Host cell transcriptional machinery

The host cell transcriptional machinery is a complex multi-component system, primarily centered around RNA polymerase II (Pol II), responsible for the synthesis of messenger RNA (mRNA) from DNA templates (Source: Nature Reviews Molecular Cell Biology, 2017). This machinery includes a vast array of general transcription factors (GTFs), co-activators, and cyclin-dependent kinases like CDK9, which are essential for the initiation, elongation, and termination of transcription (Source: UniProt). In the context of viral infections, many viruses, such as HIV-1 and SARS-CoV-2, hijack this host apparatus to express their own genomes (Source: Cell Host & Microbe, 2020). In oncology, the machinery is often dysregulated, leading to the constitutive expression of growth-promoting genes like MYC (Source: Trends in Cancer, 2018). Therapeutic agents like Actinomycin D and Flavopiridol target this machinery by intercalating DNA or inhibiting regulatory kinases, respectively (Source: PubChem). However, because transcription is a fundamental life process, targeting this machinery often results in significant systemic toxicity and a narrow therapeutic window (Source: NIH/StatPearls).

Other names

Cellular transcription apparatusHost transcription systemRNA polymerase II complexTranscription machinery

Inhibition of RNA polymerase II activity, blockade of transcription initiation or elongation, and inhibition of cyclin-dependent kinases (CDKs) that regulate the transcriptional cycle.