Prp19 complex
Definition
Target type: cellularcomponent
A protein complex consisting of Prp19 and associated proteins that is involved in the transition from the precatalytic spliceosome to the activated form that catalyzes step 1 of splicing, and which remains associated with the spliceosome through the second catalytic step. It is widely conserved, found in both yeast and mammals, though the exact composition varies. In S. cerevisiae, it contains Prp19p, Ntc20p, Snt309p, Isy1p, Syf2p, Cwc2p, Prp46p, Clf1p, Cef1p, and Syf1p. [GOC:krc, PMID:16540691, PMID:19239890]
The Prp19 complex is a large, multi-protein complex essential for pre-mRNA splicing in eukaryotes. It is located within the nucleus, specifically associated with the spliceosome, a dynamic macromolecular machine that catalyzes the removal of introns from pre-mRNA. The complex consists of multiple proteins, each contributing to its diverse functions.
The Prp19 complex primarily functions in the second step of splicing, the catalytic step. This complex plays a critical role in the rearrangement of the spliceosome, allowing the correct positioning of the catalytic center for the splicing reaction.
Here's a detailed breakdown of its cellular component:
* **Nucleus:** The Prp19 complex is confined to the nucleus, the cellular compartment where pre-mRNA splicing occurs.
* **Spliceosome:** The complex is directly associated with the spliceosome, the intricate structure responsible for intron removal. It is embedded within the spliceosome, interacting with various components to facilitate its function.
* **Spliceosomal snRNPs (small nuclear ribonucleoproteins):** The Prp19 complex interacts with several snRNPs, particularly U5 snRNP, which plays a crucial role in the catalytic step of splicing. These interactions are vital for the proper assembly and function of the spliceosome.
Overall, the Prp19 complex is a vital component of the spliceosome, residing within the nucleus and actively participating in the crucial second step of pre-mRNA splicing.'
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Proteins (3)
| Protein | Definition | Taxonomy |
|---|---|---|
| Heat shock cognate 71 kDa protein | A heat shock cognate 71 kDa protein that is encoded in the genome of cow. [OMA:P19120, PRO:DAN] | Bos taurus (cattle) |
| DNA-directed RNA polymerase II subunit RPB1 | A DNA-directed RNA polymerase II subunit RPB1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P24928] | Homo sapiens (human) |
| Heat shock cognate 71 kDa protein | A heat shock cognate 71 kDa protein that is encoded in the genome of human. [PRO:DAN] | Homo sapiens (human) |
Compounds (10)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| adenosine diphosphate | Adenosine Diphosphate: Adenosine 5'-(trihydrogen diphosphate). An adenine nucleotide containing two phosphate groups esterified to the sugar moiety at the 5'-position. | adenosine 5'-phosphate; purine ribonucleoside 5'-diphosphate | fundamental metabolite; human metabolite |
| tubercidin | tubercidin : An N-glycosylpyrrolopyrimidine that is adenosine in which the in the 5-membered ring that is not attached to the ribose moiety is replaced by a carbon. Tubercidin is produced in the culture broth of Streptomyces tubericidus. Tubercidin: An antibiotic purine ribonucleoside that readily substitutes for adenosine in the biological system, but its incorporation into DNA and RNA has an inhibitory effect on the metabolism of these nucleic acids. | antibiotic antifungal agent; N-glycosylpyrrolopyrimidine; ribonucleoside | antimetabolite; antineoplastic agent; bacterial metabolite |
| toyocamycin | toyocamycin : An N-glycosylpyrrolopyrimidine that is tubercidin in which the hydrogen at position 5 of the pyrrolopyrimidine moiety has been replaced by a cyano group. Toyocamycin: 4-Amino-5-cyano-7-(D-ribofuranosyl)-7H- pyrrolo(2,3-d)pyrimidine. Antibiotic antimetabolite isolated from Streptomyces toyocaensis cultures. It is an analog of adenosine, blocks RNA synthesis and ribosome function, and is used mainly as a tool in biochemistry. | antibiotic antifungal agent; N-glycosylpyrrolopyrimidine; nitrile; ribonucleoside | antimetabolite; antineoplastic agent; apoptosis inducer; bacterial metabolite |
| nsc 65346 | sangivamycin : A nucleoside analogue that is adenosine in which the nitrogen at position 7 is replaced by a carbamoyl-substituted carbon. It is a potent inhibitor of protein kinase C. sangivamycin: RN given refers to parent cpd | nucleoside analogue | protein kinase inhibitor |
| adenosine | quinquefolan B: isolated from roots of Panax quinquefolium L.; RN not in Chemline 10/87; RN from Toxlit | adenosines; purines D-ribonucleoside | analgesic; anti-arrhythmia drug; fundamental metabolite; human metabolite; vasodilator agent |
| 8-aminoadenosine | |||
| 3'-deoxycytidine 5'-triphosphate | |||
| 5'-deoxyadenosine | 5'-deoxyadenosine : A 5'-deoxyribonucleoside compound having adenosine as the nucleobase. 5'-deoxyadenosine: main heading DEOXYADENOSINE refers to the 3' cpd | 5'-deoxyribonucleoside; adenosines | Escherichia coli metabolite; human metabolite; mouse metabolite |
| ver 155008 | VER 155008: structure in first source | purine nucleoside | |
| nms-e973 | NMS-E973: structure in first source |