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- Polypyrimidine_tract abstract "The polypyrimidine tract is a region of messenger RNA (mRNA) that promotes the assembly of the spliceosome, the protein complex specialized for carrying out RNA splicing during the process of post-transcriptional modification. The region is rich with pyrimidine nucleotides, especially uracil, and is usually 15-20 base pairs long, located about 5-40 base pairs before the 3' end of the intron to be spliced.A number of protein factors bind to or associate with the polypyrimidine tract, including the spliceosome component U2AF and the polypyrimidine tract-binding protein (PTB), which plays a regulatory role in alternative splicing. PTB's primary function is in exon silencing, by which a particular exon region normally spliced into the mature mRNA is instead left out, resulting in the expression of an isoform of the protein for which the mRNA codes. Because PTB is ubiquitously expressed in many higher eukaryotes, it is thought to suppress the inclusion of \"weak\" exons with poorly defined splice sites. However, PTB binding is not sufficient to suppress \"robust\" exons.The suppression or selection of exons is critical to the proper expression of tissue-specific isoforms. For example, smooth muscle and skeletal muscle express alternate isoforms distinguished by mutually exclusive exon selection in alpha-tropomyosin.".
- Polypyrimidine_tract thumbnail Ppy-tract-2g4b.png?width=300.
- Polypyrimidine_tract wikiPageID "6997890".
- Polypyrimidine_tract wikiPageLength "2521".
- Polypyrimidine_tract wikiPageOutDegree "26".
- Polypyrimidine_tract wikiPageRevisionID "486337750".
- Polypyrimidine_tract wikiPageWikiLink Alternative_splicing.
- Polypyrimidine_tract wikiPageWikiLink Base_pair.
- Polypyrimidine_tract wikiPageWikiLink Category:Gene_expression.
- Polypyrimidine_tract wikiPageWikiLink Category:Spliceosome.
- Polypyrimidine_tract wikiPageWikiLink Directionality_(molecular_biology).
- Polypyrimidine_tract wikiPageWikiLink Eukaryote.
- Polypyrimidine_tract wikiPageWikiLink Exon.
- Polypyrimidine_tract wikiPageWikiLink Gene_expression.
- Polypyrimidine_tract wikiPageWikiLink Genetic_code.
- Polypyrimidine_tract wikiPageWikiLink Intron.
- Polypyrimidine_tract wikiPageWikiLink Messenger_RNA.
- Polypyrimidine_tract wikiPageWikiLink Multiprotein_complex.
- Polypyrimidine_tract wikiPageWikiLink Nucleotide.
- Polypyrimidine_tract wikiPageWikiLink Polypyrimidine_tract-binding_protein.
- Polypyrimidine_tract wikiPageWikiLink Post-transcriptional_modification.
- Polypyrimidine_tract wikiPageWikiLink Protein_isoform.
- Polypyrimidine_tract wikiPageWikiLink Pyrimidine.
- Polypyrimidine_tract wikiPageWikiLink RNA_splicing.
- Polypyrimidine_tract wikiPageWikiLink Skeletal_muscle.
- Polypyrimidine_tract wikiPageWikiLink Smooth_muscle_tissue.
- Polypyrimidine_tract wikiPageWikiLink Spliceosome.
- Polypyrimidine_tract wikiPageWikiLink Tissue_(biology).
- Polypyrimidine_tract wikiPageWikiLink Tropomyosin.
- Polypyrimidine_tract wikiPageWikiLink Uracil.
- Polypyrimidine_tract wikiPageWikiLink File:Ppy-tract-2g4b.png.
- Polypyrimidine_tract wikiPageWikiLinkText "Polypyrimidine tract".
- Polypyrimidine_tract wikiPageWikiLinkText "polypyrimidine tract".
- Polypyrimidine_tract subject Category:Gene_expression.
- Polypyrimidine_tract subject Category:Spliceosome.
- Polypyrimidine_tract hypernym Region.
- Polypyrimidine_tract type Settlement.
- Polypyrimidine_tract type Process.
- Polypyrimidine_tract comment "The polypyrimidine tract is a region of messenger RNA (mRNA) that promotes the assembly of the spliceosome, the protein complex specialized for carrying out RNA splicing during the process of post-transcriptional modification.".
- Polypyrimidine_tract label "Polypyrimidine tract".
- Polypyrimidine_tract sameAs Q7226900.
- Polypyrimidine_tract sameAs m.0g_k5d.
- Polypyrimidine_tract sameAs Q7226900.
- Polypyrimidine_tract wasDerivedFrom Polypyrimidine_tract?oldid=486337750.
- Polypyrimidine_tract depiction Ppy-tract-2g4b.png.
- Polypyrimidine_tract isPrimaryTopicOf Polypyrimidine_tract.