DNA-directed DNA polymerase and DNA-directed RNA polymerase (DNA polymerase (for DNA-directed DNA polymerase), RNA polymerase (for DNA-directed RNA polymerase))

DNA and RNA polymerases are families of enzymes that catalyze the synthesis of DNA and RNA, respectively. **DNA polymerase** is central to the accurate replication and repair of DNA, using an existing DNA strand as a template to assemble a new complementary strand during the S phase of the cell cycle. It requires a primer and proofreads for errors, ensuring fidelity in genetic transmission[1][2]. **RNA polymerase** synthesizes RNA from a DNA template in the process of transcription, a crucial step in gene expression. Unlike DNA polymerase, RNA polymerase does not require a primer and is involved in multiple stages: initiation (binding to promoter), elongation (synthesizing the RNA strand), and termination (releasing the transcript)[3][4][5][6]. These enzymes are found in all domains of life, and viral polymerases demonstrate additional diversity, such as RNA-dependent RNA polymerases and reverse transcriptases[7]. Both DNA and RNA polymerases are validated therapeutic targets for cancer, infection, and genetic diseases, but the term "RNA/DNA Polymerases" is overly broad, as it groups functionally and structurally distinct enzymes under a generic label, which can lead to ambiguity in drug development and clinical contexts.

Other names

DNA-dependent DNA polymeraseDNA-dependent RNA polymeraseDNA polymeraseRNA polymeraseRNAPDNA replicaseDNA-directed RNA polymerase

Inhibition of polymerase active site (competitive or non-competitive) Chain termination by incorporation of analogs Allosteric inhibition Blocking initiation or elongation of nucleic acid synthesis