DNA-directed RNA polymerase

DNA-directed RNA polymerase
DNA-di·rect·ed RNA po·lym·er·ase (dĭ-rekґtəd pə-limґər-ās) [EC] any of the enzymes of the transferase class that catalyze the template-directed step-by-step addition of ribonucleotides to the 3′ end of a growing RNA chain, using a single-stranded DNA template. The reaction is important in the flow of information from DNA to proteins. Prokaryotes have a single such polymerase, while eukaryotes have three: type I transcribes most ribosomal RNA (rRNA) genes; type II synthesizes messenger (mRNA), some small nuclear (snRNA), and many small nucleolar RNA (snoRNA) molecules; and type III transcribes the genes for one species of rRNA, for transfer RNA (tRNA), and for various small RNA molecules. Called also RNA polymerase.

Medical dictionary. 2011.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • RNA polymerase II subunit B4 — DNA directed RNA polymerase II polypeptide D (or subunit B4), also known as POLR2D, is a human gene. PBB Summary section title = summary text = This gene encodes the fourth largest subunit of RNA polymerase II, the polymerase responsible for… …   Wikipedia

  • RNA-dependent RNA polymerase — (RDRP), or RNA replicase, is an enzyme that catalyzes the replication of RNA from an RNA template. This is in contrast to a typical RNA polymerase, which catalyzes the transcription of RNA from a DNA template.Viral RDRPs were discovered in the… …   Wikipedia

  • RNA polymerase — RNAP from T. aquaticus pictured during elongation. Portions of the enzyme were made transparent so as to make the path of RNA and DNA more clear. The magnesium ion (yellow) is located at the enzyme active site. RNA polymerase (RNAP or RNApol) is… …   Wikipedia

  • (RNA-polymerase)-subunit kinase — In enzymology, a [RNA polymerase] subunit kinase (EC number| is an enzyme that catalyzes the chemical reaction:ATP + [DNA directed RNA polymerase] ightleftharpoons ADP + phospho [DNA directed RNA polymerase] Thus, the two substrates of… …   Wikipedia

  • RNA polymerase — A polymerase is an enzyme that catalyzes the joining of many smaller molecules (called monomers) to form a big molecule (a macromolecule). RNA polymerase is a unique enzyme that makes (synthesizes) the macromolecule RNA using DNA as the template …   Medical dictionary

  • RNA polymerase II — (also called RNAP II and Pol II) is an enzyme found in eukaryotic cells. It catalyzes the transcription of DNA to synthesize precursors of mRNA and most snRNA and microRNA. [cite journal | author = Kronberg, R.D. | title = Eukaryotic… …   Wikipedia

  • DNA-directed DNA polymerase — DNA di·rect·ed DNA po·lym·er·ase (dĭ rekґtəd pə limґər ās) [EC] any of the enzymes of the transferase class that catalyze the template directed, step by step addition of deoxyribonucleotides to the 3′ end of …   Medical dictionary

  • DNA polymerase — 3D structure of the DNA binding helix turn helix motifs in human DNA polymerase beta A DNA polymerase is an enzyme that helps catalyze in the polymerization of deoxyribonucleotides into a DNA strand. DNA polymerases are best known for their… …   Wikipedia

  • DNA polymerase III holoenzyme — Pol III can also refer to HNoMS Pol III, a Norwegian guard vessel from WWII DNA polymerase III holoenzyme is the primary enzyme complex involved in prokaryotic DNA replication. It was discovered by Thomas Kornberg (son of Arthur Kornberg) and… …   Wikipedia

  • Polymerase — Structure of Taq DNA polymerase A polymerase (EC is an enzyme whose central function is associated with polymers of nucleic acids such as RNA and DNA. The primary function of a polymerase is the polymerization of new DNA or… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”