Host cell transcription machinery

The host cell transcription machinery refers to the collection of enzymes, protein complexes, and regulatory factors required for the transcription of DNA into RNA within eukaryotic cells, primarily DNA-dependent RNA polymerases (e.g., RNA polymerase II for mRNA synthesis), general transcription factors, mediator complexes, and chromatin-modifying enzymes[3][2]. This machinery is essential for gene expression and normal cellular function. Many viruses subvert or hijack the host transcription machinery to redirect the cell's resources for viral gene expression, often shutting off the production of host mRNAs[5][6]. Pharmacologically, targeting host transcription machinery is non-specific and generally cytotoxic, as it affects gene expression globally. However, certain drugs and toxins (e.g., actinomycin D, α-amanitin) and experimental modulators of chromatin structure can inhibit or modulate transcription. Altered transcriptional activity is implicated in various diseases, including viral infections (which exploit these enzymes), cancers (where transcription may be dysregulated), and other conditions involving aberrant gene expression[2][6][3].

Other names

Host transcription machineryCellular transcription machineryHost RNA polymerase complexesTranscriptional apparatus

Inhibition of RNA polymerase, Inhibition of transcription factor binding or function, Chromatin modification, Viral hijacking or suppression of host mRNA synthesis