GO:0000974 Prp19 complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000974 (Prp19 complex) is a conserved spliceosomal protein complex that drives the transition from the precatalytic spliceosome to the activated form that catalyzes step 1 of splicing and remains associated through step 2.
• The complex is built around PRP19 and includes additional proteins such as CDC5L, PLRG1, SPF27, CTNNBL1, and others; its exact composition varies between yeast and mammals [1,6].
• The Prp19 complex is required for specifying interactions of U5 and U6 snRNAs with pre-mRNA during spliceosome activation.
• Beyond splicing, the Prp19 complex directly functions in mitotic spindle assembly, linking it to cell division.
• The complex is implicated in neuronal differentiation through Akt-dependent formation of a Prp19 alpha/14-3-3beta/Cdc5L complex.
• Trypanosomes use a distinct complex of PRP19-related and trypanosomatid-specific proteins for pre-mRNA splicing, highlighting evolutionary diversity [2,3].
Description
The Prp19 complex (GO:0000974) is a multisubunit protein assembly that functions at a critical step in pre-mRNA splicing: the conversion of the precatalytic spliceosome into the activated spliceosome that catalyzes the first transesterification reaction of splicing. This complex is widely conserved from yeast to humans, although its exact subunit composition differs among species. The complex was initially identified through a functional association of essential splicing factors with PRP19 in a protein complex. Subsequent work revealed that the human Prp19/CDC5L complex has a defined molecular architecture, and that the Prp19-associated complex is required for specifying interactions of U5 and U6 with pre-mRNA during spliceosome activation. Researchers study GO:0000974 because it sits at the heart of spliceosome activation, a step whose fidelity is essential for accurate gene expression. In addition to its canonical splicing role, the Prp19 complex has been linked to mitotic spindle assembly and to neuronal differentiation via Akt-dependent complex formation. In trypanosomes, a distinct complex of PRP19-related and trypanosomatid-specific proteins is required for pre-mRNA splicing [2,3], underscoring the evolutionary plasticity of this machinery. Understanding the Prp19 complex therefore provides insight into fundamental RNA processing, cell division, and differentiation pathways.
Prp19 complex At A Glance
| GO ID | GO:0000974 |
|---|---|
| GO term | Prp19 complex |
| Ontology | cellular_component |
| Synonym | MOS4-Associated Complex; nineteen complex; NTC; Prp19/CDC5 complex |
| Major function | Transition from precatalytic spliceosome to activated spliceosome; remains associated through step 2 of splicing |
| Conservation | Widely conserved in yeast and mammals, with variable subunit composition |
| Yeast subunits | Prp19p, Ntc20p, Snt309p, Isy1p, Syf2p, Cwc2p, Prp46p, Clf1p, Cef1p, Syf1p |
| Additional roles | Mitotic spindle assembly; neuronal differentiation |
What Is GO:0000974?
The Prp19 complex is 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.
Why Is Prp19 complex Important in Cell Biology?
The Prp19 complex is essential for spliceosome activation, a step that determines whether pre-mRNA can proceed to catalytic splicing [1,7]. Because splicing is required for the expression of most eukaryotic genes, defects in Prp19 complex function can have broad cellular consequences. The complex also has non-splicing roles, including mitotic spindle assembly and neuronal differentiation, which expand its relevance to cell division and development. In trypanosomes, a distinct PRP19-related complex is required for splicing [2,3], making it a potential target in parasitic diseases. For researchers, GO:0000974 represents a focal point for understanding RNA processing, cell cycle regulation, and differentiation, and it offers opportunities for therapeutic intervention in diseases linked to splicing dysfunction.
• Required for the transition from precatalytic to activated spliceosome.
• Specifies interactions of U5 and U6 snRNAs with pre-mRNA during spliceosome activation.
• Remains associated with the spliceosome through the second catalytic step of splicing.
• Directly functions in mitotic spindle assembly, linking splicing machinery to cell division.
• Involved in neuronal differentiation via Akt-dependent Prp19 alpha/14-3-3beta/Cdc5L complex formation.
• Conserved in yeast and mammals, enabling comparative studies.
• Trypanosomes require a distinct PRP19-related complex for pre-mRNA splicing [2,3].
• Human Prp19/CDC5L complex has a defined molecular architecture that can be studied biochemically.
• Functional association of essential splicing factors with PRP19 was demonstrated in early work.
• Potential target for understanding splicing-related diseases and parasite biology [1,2,3].
What Happens During Prp19 complex?
Spliceosome Activation
In simple terms: The Prp19 complex helps switch the spliceosome into its active form so it can cut and join RNA.
The Prp19 complex is involved in the transition from the precatalytic spliceosome to the activated form that catalyzes step 1 of splicing. It remains associated with the spliceosome through the second catalytic step. The Prp19-associated complex is required for specifying interactions of U5 and U6 with pre-mRNA during spliceosome activation.
U5 and U6 snRNA Interactions
In simple terms: The complex makes sure the right RNA pieces connect before splicing occurs.
The Prp19-associated complex is required for specifying interactions of U5 and U6 with pre-mRNA during spliceosome activation. This step is critical for positioning the spliceosome for catalysis.
Mitotic Spindle Assembly
In simple terms: The Prp19 complex also helps build the machinery that separates chromosomes during cell division.
The Prp19 complex directly functions in mitotic spindle assembly. This indicates a role beyond splicing in cell division.
Neuronal Differentiation
In simple terms: The complex participates in signaling that helps nerve cells mature.
Akt-dependent formation of a Prp19 alpha/14-3-3beta/Cdc5L complex is implicated in neuronal differentiation.
Key Genes Involved in GO:0000974 Prp19 complex
The following genes and proteins are key components or interactors of the Prp19 complex (GO:0000974) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PRP19 | Core subunit of the Prp19 complex; essential splicing factor [1,5] | Central to spliceosome activation; target for functional studies [1,5] |
| CDC5L | Component of the human Prp19/CDC5L complex | Architecture and function of human complex |
| PLRG1 | Subunit of the human Prp19/CDC5L complex | Complex assembly and splicing |
| SPF27 | Subunit of the human Prp19/CDC5L complex | Complex integrity |
| CTNNBL1 | Subunit of the human Prp19/CDC5L complex | Complex function |
| PRP46 | Yeast Prp19 complex subunit | Conserved component |
| CLF1 | Yeast Prp19 complex subunit | Conserved component |
| CEF1 | Yeast Prp19 complex subunit | Conserved component |
| SYF1 | Yeast Prp19 complex subunit | Conserved component |
| ISY1 | Yeast Prp19 complex subunit | Conserved component |
| SYF2 | Yeast Prp19 complex subunit | Conserved component |
| CWC2 | Yeast Prp19 complex subunit | Conserved component |
| NTC20 | Yeast Prp19 complex subunit | Conserved component |
| SNT309 | Yeast Prp19 complex subunit | Conserved component |
| 14-3-3beta | Interacts with Prp19 alpha in neuronal differentiation | Signaling-dependent complex formation |
| Akt | Kinase involved in Prp19 alpha/14-3-3beta/Cdc5L complex formation | Regulation of complex assembly |
How Is Prp19 complex Regulated?
The Prp19 complex is regulated in part through Akt-dependent formation of a Prp19 alpha/14-3-3beta/Cdc5L complex during neuronal differentiation. This indicates that signaling pathways can influence the assembly or activity of the complex. Additionally, the complex remains associated with the spliceosome through the second catalytic step, suggesting that its recruitment and release are tightly coordinated with the splicing cycle.
Prp19 complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PRP19 | Splicing-related disorders | Knockout or knockdown in cell lines |
| CDC5L | Cell division defects | Mitotic spindle assays |
| PRP19 | Neuronal differentiation | Akt-dependent differentiation models |
| PRP19-related | Trypanosome infection | Trypanosome splicing assays [2,3] |
Splicing Dysfunction and Disease
Because the Prp19 complex is required for spliceosome activation [1,7], defects in its components could lead to aberrant splicing, which is associated with various diseases. However, specific disease associations for Prp19 complex subunits are not detailed in the provided citations.
Cancer and Cell Division
The Prp19 complex directly functions in mitotic spindle assembly, suggesting that its dysregulation might affect cell division and potentially contribute to cancer. Further studies are needed to establish direct links.
Neurodegeneration and Differentiation
The involvement of the Prp19 complex in neuronal differentiation via Akt-dependent mechanisms raises the possibility that its dysfunction could impact neuronal development or survival.
Parasitic Infections
Trypanosomes require a distinct complex of PRP19-related and trypanosomatid-specific proteins for pre-mRNA splicing [2,3], making this complex a potential target for antiparasitic drugs.
From Prp19 complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of PRP19 in spliceosome activation? | Knockout of PRP19 in yeast or mammalian cells [1,7] |
| How does the human Prp19/CDC5L complex assemble? | Tagged knock-in of subunits for proteomics |
| Does Prp19 complex function in mitosis? | Point mutations in spindle assembly assays |
| How is Prp19 complex regulated by Akt? | Overexpression of Akt or 14-3-3beta |
| What is the composition in trypanosomes? | Knockout of trypanosomatid-specific proteins [2,3] |
| Can we screen for splicing defects? | CRISPR library screening targeting complex subunits |
How to Study the Prp19 complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Affinity purification-mass spectrometry | Protein composition and interactions | Identifying Prp19 complex subunits |
| In vitro splicing assay | Spliceosome activation and catalysis | Testing requirement for Prp19 complex |
| RNA-seq | Global splicing changes | Knockdown/knockout studies |
| Fluorescence microscopy | Mitotic spindle assembly | Assessing Prp19 complex role in mitosis |
| Co-immunoprecipitation | Complex formation | Akt-dependent assembly |
| CRISPR knockout | Gene function | Loss-of-function studies |
| CRISPR library screening | Phenotypic screens | Identifying splicing factors |
Proteomics and Complex Purification
Affinity purification followed by mass spectrometry can identify subunits and interactors of the Prp19 complex, as demonstrated for the human Prp19/CDC5L complex.
RNA-Based Splicing Assays
In vitro splicing assays and RNA-seq can measure the requirement for the Prp19 complex in spliceosome activation and U5/U6 snRNA interactions.
Imaging of Mitotic Spindles
Fluorescence microscopy can assess mitotic spindle assembly defects upon perturbation of Prp19 complex components.
Differentiation Models
Neuronal differentiation assays can test the role of Akt-dependent Prp19 alpha/14-3-3beta/Cdc5L complex formation.
How CRISPR Can Be Used to Study GO:0000974 Prp19 complex
Knockout
CRISPR knockout of PRP19 or other subunits can reveal essential roles in spliceosome activation and cell viability [1,7].
Point Mutation
Point mutations can be introduced to dissect specific domains required for complex assembly or catalytic step transitions.
Knock-in
Tagged knock-in of subunits enables affinity purification and live-cell imaging of the Prp19 complex.
Overexpression
Overexpression of components or regulators like Akt can test gain-of-function effects on complex formation and differentiation.
How EDITGENE Supports Prp19 complex Research
Researchers studying Prp19 complex-related genes often need to determine whether a candidate gene is causally involved in splicing, cell division, or differentiation. EDITGENE provides CRISPR-based services to create precise cellular models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for Prp19 complex research.
Frequently Asked Questions About Prp19 complex
What is the Prp19 complex?
The Prp19 complex (GO:0000974) is a protein complex involved in the transition from the precatalytic spliceosome to the activated form that catalyzes step 1 of splicing, and it remains associated through step 2.
What genes are involved in the Prp19 complex?
Key genes include PRP19, CDC5L, PLRG1, SPF27, CTNNBL1, and in yeast Prp19p, Ntc20p, Snt309p, Isy1p, Syf2p, Cwc2p, Prp46p, Clf1p, Cef1p, and Syf1p [1,6].
What is the function of GO:0000974?
It functions in spliceosome activation, specifically specifying U5 and U6 snRNA interactions with pre-mRNA.
Is the Prp19 complex conserved?
Yes, it is widely conserved in yeast and mammals, though the exact composition varies.
Does the Prp19 complex have non-splicing roles?
Yes, it directly functions in mitotic spindle assembly and is implicated in neuronal differentiation.
How is the Prp19 complex regulated?
It can be regulated by Akt-dependent formation of a Prp19 alpha/14-3-3beta/Cdc5L complex.
What methods are used to study the Prp19 complex?
Affinity purification-mass spectrometry, in vitro splicing assays, RNA-seq, and fluorescence microscopy [6,7,4].
What diseases are linked to the Prp19 complex?
Splicing dysfunction, cancer, neurodegeneration, and parasitic infections are potential areas, though direct links require further study [1,4,8,2,3].
Can CRISPR be used to study Prp19 complex genes?
Yes, knockout, point mutation, knock-in, and overexpression models can be generated [1,6,8].
What is the synonym for Prp19 complex?
Synonyms include MOS4-Associated Complex, nineteen complex, NTC, and Prp19/CDC5 complex.
Conclusion
The Prp19 complex (GO:0000974) is a conserved spliceosomal complex essential for spliceosome activation and splicing catalysis [1,7]. Its roles extend to mitotic spindle assembly and neuronal differentiation, and it exhibits evolutionary diversity in trypanosomes [2,3]. Studying this complex provides fundamental insights into RNA processing and cell biology, with potential implications for disease and therapeutics.
References
- 1. Chanarat S et al.. 2013. Splicing and beyond: the many faces of the Prp19 complex.. Biochim Biophys Acta 1833(10):2126-34 PMID: 23742842
- 2. Srivastava A et al.. 2021. A distinct complex of PRP19-related and trypanosomatid-specific proteins is required for pre-mRNA splicing in trypanosomes.. Nucleic Acids Res 49(22):12929-12942 PMID: 34850936
- 3. Ambrósio DL et al.. 2015. The spliceosomal PRP19 complex of trypanosomes.. Mol Microbiol 95(5):885-901 PMID: 25524563
- 4. Hofmann JC et al.. 2013. The Prp19 complex directly functions in mitotic spindle assembly.. PLoS One 8(9):e74851 PMID: 24069358
- 5. Tarn WY et al.. 1994. Functional association of essential splicing factor(s) with PRP19 in a protein complex.. EMBO J 13(10):2421-31 PMID: 8194532
- 6. Grote M et al.. 2010. Molecular architecture of the human Prp19/CDC5L complex.. Mol Cell Biol 30(9):2105-19 PMID: 20176811
- 7. Chan SP et al.. 2005. The Prp19-associated complex is required for specifying interactions of U5 and U6 with pre-mRNA during spliceosome activation.. J Biol Chem 280(35):31190-9 PMID: 15994330
- 8. Urano-Tashiro Y et al.. 2010. Implication of Akt-dependent Prp19 alpha/14-3-3beta/Cdc5L complex formation in neuronal differentiation.. J Neurosci Res 88(13):2787-97 PMID: 20629186
