Do archaea have transcription?
Archaea are reliant on a transcription apparatus that is homologous to the eukaryotic transcription machinery; similarities include additional RNAP subunits that form a discrete subdomain of RNAP (3, 4) as well as basal transcription factors that direct transcription initiation and elongation (5–8).
How is transcription in archaea controlled?
REGULATED TRANSCRIPTION INITIATION Transcription initiation is tightly regulated by both transcription factors and DNA elements. The minimal, necessary proteins and DNA elements for archaeal transcription initiation are now well defined and characterized (21,–28).
Does archaea use RNA polymerase?
Archaea, like Bacteria, utilize only one type of RNA polymerase (RNAP) to transcribe all genes but its subunit composition and architecture is strikingly similar to eukaryotic RNAPII.
Do archaea coupled transcription and translation?
Coupling of Transcription and Translation in Archaea: Cues From the Bacterial World. The lack of a nucleus is the defining cellular feature of bacteria and archaea. Consequently, transcription and translation are occurring in the same compartment, proceed simultaneously and likely in a coupled fashion.
Where does transcription occur in archaea?
Because archaea lack a membrane-enclosed nucleus like bacteria do, transcription and translation can happen at the same time on a newly-generated piece of mRNA. Operons are widespread in archaea.
Do archaea have operons?
Operons are groups of genes that are transcribed in a single mRNA. Operons are widespread in all bacterial and archaeal genomes [1–3], and in the typical genome, about half of all protein-coding genes are in multigene operons.
Do archaea have plasmids?
Plasmids occur widely in archaea and are most common in haloarchaea. Among 15 haloarchaea for which complete genomes have been determined, only one lacks a plasmid (40). Systematic screening for plasmids has also been conducted for two families of thermophilic archaea, the Sulfolobaceae and Thermococcaceae.
Where does translation occur in archaea?
ribosomes
The process of translation occurs on subcellular particles called ribosomes and involves the decoding of nucleotide sequence information carried on mRNA into amino acid sequence of protein.
Who discovered TATA box?
Discovery. The TATA box was the first eukaryotic core promoter motif to be identified in 1978 by American biochemist David Hogness while he and his graduate student, Michael Goldberg were on sabbatical at the University of Basel in Switzerland.