Biology:Beta-globin co-transcriptional cleavage ribozyme
| Beta-globin co-transcriptional cleavage ribozyme | |
|---|---|
 Predicted secondary structure and sequence conservation of CoTC_ribozyme | |
| Identifiers | |
| Symbol | CoTC_ribozyme |
| Rfam | RF00621 |
| Other data | |
| RNA type | Gene; ribozyme |
| Domain(s) | Eukaryota |
| SO | 0000374 |
| PDB structures | PDBe |
The Beta-globin co-transcriptional cleavage ribozyme (CotC ribozyme) was proposed to be an RNA enzyme known as a ribozyme.
Transcription termination of RNA polymerase II transcripts is proposed to occur by a two-stage process.[1] The first stage involves pre-termination cleavage (PTC) of the nascent transcript downstream of the poly(A) site. This process is also referred to as co-transcriptional cleavage (CoTC). The CoTC process in the human beta-globin gene was proposed to involve an RNA self-cleaving activity located in the 3' flanking region of the beta-globin gene. The CoTC core is highly conserved in the 3' UTR of other primate beta-globin genes.[2]
However, there has been no independent confirmation of these findings, and a subsequent analysis by a team including members of the original report failed to demonstrate ribozyme activity.[3]
References
- ↑ "Multiple transcript cleavage precedes polymerase release intermination by RNA polymerase II.". Cell 105 (5): 669–681. 2001. doi:10.1016/S0092-8674(01)00372-5. PMID 11389836.
- ↑ "Autocatalytic RNA cleavage in the human beta-globin pre-mRNA promotestranscription termination.". Nature 432 (7016): 526–530. 2004. doi:10.1038/nature03032. PMID 15565159.
- ↑ "Exon tethering in transcription by RNA polymerase II". Molecular Cell 21 (6): 849–859. 2006. doi:10.1016/j.molcel.2006.01.032. PMID 16543153.
External links
 |  |
