3k6g: Difference between revisions
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{{STRUCTURE_3k6g| PDB=3k6g | SCENE= }} | {{STRUCTURE_3k6g| PDB=3k6g | SCENE= }} | ||
===Crystal structure of Rap1 and TRF2 complex=== | ===Crystal structure of Rap1 and TRF2 complex=== | ||
{{ABSTRACT_PUBMED_21217703}} | |||
==Function== | |||
[[http://www.uniprot.org/uniprot/TE2IP_HUMAN TE2IP_HUMAN]] Acts both as a regulator of telomere function and as a transcription regulator. Involved in the regulation of telomere length and protection as a component of the shelterin complex (telosome). In contrast to other components of the shelterin complex, it is dispensible for telomere capping and does not participate in the protection of telomeres against non-homologous end-joining (NHEJ)-mediated repair. Instead, it is required to negatively regulate telomere recombination and is essential for repressing homology-directed repair (HDR), which can affect telomere length. Does not bind DNA directly: recruited to telomeric double-stranded 5'-TTAGGG-3' repeats via its interaction with TERF2. Independently of its function in telomeres, also acts as a transcription regulator: recruited to extratelomeric 5'-TTAGGG-3' sites via its association with TERF2 or other factors, and regulates gene expression. When cytoplasmic, associates with the I-kappa-B-kinase (IKK) complex and acts as a regulator of the NF-kappa-B signaling by promoting IKK-mediated phosphorylation of RELA/p65, leading to activate expression of NF-kappa-B target genes.<ref>PMID:16166375</ref> <ref>PMID:19763083</ref> [[http://www.uniprot.org/uniprot/TERF2_HUMAN TERF2_HUMAN]] Binds the telomeric double-stranded 5'-TTAGGG-3' repeat and plays a central role in telomere maintenance and protection against end-to-end fusion of chromosomes. In addition to its telomeric DNA-binding role, required to recruit a number of factors and enzymes required for telomere protection, including the shelterin complex, TERF2IP/RAP1 and DCLRE1B/Apollo. Component of the shelterin complex (telosome) that is involved in the regulation of telomere length and protection. Shelterin associates with arrays of double-stranded 5'-TTAGGG-3' repeats added by telomerase and protects chromosome ends; without its protective activity, telomeres are no longer hidden from the DNA damage surveillance and chromosome ends are inappropriately processed by DNA repair pathways. Together with DCLRE1B/Apollo, plays a key role in telomeric loop (T loop) formation by generating 3' single-stranded overhang at the leading end telomeres: T loops have been proposed to protect chromosome ends from degradation and repair. Required both to recruit DCLRE1B/Apollo to telomeres and activate the exonuclease activity of DCLRE1B/Apollo. Preferentially binds to positive supercoiled DNA. Together with DCLRE1B/Apollo, required to control the amount of DNA topoisomerase (TOP1, TOP2A and TOP2B) needed for telomere replication during fork passage and prevent aberrant telomere topology. Recruits TERF2IP/RAP1 to telomeres, thereby participating in to repressing homology-directed repair (HDR), which can affect telomere length.<ref>PMID:9476899</ref> <ref>PMID:16166375</ref> <ref>PMID:20655466</ref> | |||
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==About this Structure== | ==About this Structure== | ||
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==Reference== | ==Reference== | ||
<ref group="xtra">PMID: | <ref group="xtra">PMID:021217703</ref><references group="xtra"/><references/> | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Chang, S.]] | [[Category: Chang, S.]] | ||
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[[Category: Yang, Y T.]] | [[Category: Yang, Y T.]] | ||
[[Category: Zheng, H.]] | [[Category: Zheng, H.]] | ||
[[Category: Cell cycle]] | |||
[[Category: Chromosomal protein]] | |||
[[Category: Dna-binding]] | |||
[[Category: Helix]] | |||
[[Category: Nucleus]] | |||
[[Category: Phosphoprotein]] | |||
[[Category: Protein binding]] | |||
[[Category: Telomere]] | |||
