Tbio PTBP1 Polypyrimidine tract-binding protein 1

Protein Summary

Description

Plays a role in pre-mRNA splicing and in the regulation of alternative splicing events. Activates exon skipping of its own pre-mRNA during muscle cell differentiation. Binds to the polypyrimidine tract of introns. May promote RNA looping when bound to two separate polypyrimidine tracts in the same pre-mRNA. May promote the binding of U2 snRNP to pre-mRNA. Cooperates with RAVER1 to modulate switching between mutually exclusive exons during maturation of the TPM1 pre-mRNA. Represses the splicing of MAPT/Tau exon 10 (PubMed:15009664). In case of infection by picornaviruses, binds to the viral internal ribosome entry site (IRES) and stimulates the IRES-mediated translation (PubMed:21518806). This gene belongs to the subfamily of ubiquitously expressed heterogeneous nuclear ribonucleoproteins (hnRNPs). The hnRNPs are RNA-binding proteins and they complex with heterogeneous nuclear RNA (hnRNA). These proteins are associated with pre-mRNAs in the nucleus and appear to influence pre-mRNA processing and other aspects of mRNA metabolism and transport. While all of the hnRNPs are present in the nucleus, some seem to shuttle between the nucleus and the cytoplasm. The hnRNP proteins have distinct nucleic acid binding properties. The protein encoded by this gene has four repeats of quasi-RNA recognition motif (RRM) domains that bind RNAs. This protein binds to the intronic polypyrimidine tracts that requires pre-mRNA splicing and acts via the protein degradation ubiquitin-proteasome pathway. It may also promote the binding of U2 snRNP to pre-mRNAs. This protein is localized in the nucleoplasm and it is also detected in the perinucleolar structure. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

Uniprot Accession IDs

• P26599
• Q9BUQ0
• PTB

Gene Name

• PTBP1

Ensembl ID

• ENST00000349038
• ENSP00000014112
• ENSG00000011304
• ENST00000356948
• ENSP00000349428
• ENST00000394601
• ENSP00000408096

Symbol

• PTB
• PTB
• PTB2
• PTB3
• PTB4
• pPTB
• HNRPI
• PTB-1
• PTB-T
• HNRNPI
• HNRNP-I

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
interacting protein	1
transcription factor binding site profile	0.96
kinase perturbation	0.95
hub protein	0.88
ligand (protein) perturbation	0.83

Protein Classes

No PANTHER Classes or DTO Classes found

IDG Development Level Summary

Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 664.65   (req: < 5)

Gene RIFs: 154   (req: <= 3)

Antibodies: 404   (req: <= 50)

Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 664.65   (req: >= 5)

Gene RIFs: 154   (req: > 3)

Antibodies: 404   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 15

Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligand: 0

Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0