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TP53BP1
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TP53BP1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesTP53BP1, 53BP1, p202, p53BP1, TP53, TDRD30, tumor protein p53 binding protein 1
External IDsOMIM: 605230; MGI: 1351320; HomoloGene: 4137; GeneCards: TP53BP1; OMA:TP53BP1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001141979
NM_001141980
NM_005657
NM_001355001

NM_001290830
NM_013735

RefSeq (protein)

NP_001135451
NP_001135452
NP_005648
NP_001341930

NP_001277759
NP_038763

Location (UCSC)Chr 15: 43.4 – 43.51 MbChr 2: 121.02 – 121.1 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Tumor suppressor p53-binding protein 1 also known as p53-binding protein 1 or 53BP1 is a protein that in humans is encoded by the TP53BP1 gene.[5][6][7]

Clinical significance

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53BP1 is underexpressed in most cases of triple-negative breast cancer.[8]

DNA repair

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DNA double-strand breaks (DSBs) are cytotoxic damages that can be repaired either by the homologous recombinational repair (HR) pathway or by the non-homologous end-joining (NHEJ) pathway. NHEJ, although faster than HR, is less accurate. The early divergent step between the two pathways is end resection, and this step is regulated by numerous factors. In particular, BRCA1 and 53BP1 play a role in determining the balance between the two pathways.[9][10] 53BP1 restricts resection and promotes NHEJ.

Age-associated deficient repair

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Ordinarily during the G1 phase of the cell cycle, when a sister chromatid is unavailable for HR, NHEJ is the predominant pathway for repairing DNA double-strand breaks (DSBs). However, as individuals age, recruitment of 53BP1 to DSBs during G1 becomes deficient.[11] The absence of 53BP1 at such DSBs appears to promote the alternative error-prone repair process Alt-EJ.[11] This repair process, also referred to as microhomology-mediated end joining, is highly inaccurate and likely contributes to the aging process.

Interactions

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53BP1 has been shown to physically interact with:

References

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Further reading

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