Tchem TERF2 Telomeric repeat-binding factor 2

Protein Summary

Description

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. This gene encodes a telomere specific protein, TERF2, which is a component of the telomere nucleoprotein complex. This protein is present at telomeres in metaphase of the cell cycle, is a second negative regulator of telomere length and plays a key role in the protective activity of telomeres. While having similar telomere binding activity and domain organization, TERF2 differs from TERF1 in that its N terminus is basic rather than acidic. [provided by RefSeq, Jul 2008]

Uniprot Accession IDs

• Q15554

Gene Name

• TERF2

Ensembl ID

• ENST00000254942
• ENSP00000254942
• ENSG00000132604
• ENST00000567296
• ENSP00000454955

Symbol

• TRBF2
• TRF2
• TRF2
• TRBF2

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
disease perturbation	0.97
biological process	0.93
ligand (protein) perturbation	0.83
transcription factor binding site profile	0.8
transcription factor perturbation	0.8

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: 116.37   (req: < 5)

Gene RIFs: 164   (req: <= 3)

Antibodies: 523   (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: 116.37   (req: >= 5)

Gene RIFs: 164   (req: > 3)

Antibodies: 523   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 35

Tchem

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

Active Ligands: 8

Tclin

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

Active Drug: 0