DNA endonuclease RBBP8 - A6QNQ6 (CTIP_BOVIN)


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Endonuclease that cooperates with the MRE11-RAD50-NBN (MRN) complex in DNA-end resection, the first step of double-strand break (DSB) repair through the homologous recombination (HR) pathway. HR is restricted to S and G2 phases of the cell cycle and preferentially repairs DSBs resulting from replication fork collapse. Key determinant of DSB repair pathway choice, as it commits cells to HR by preventing classical non-homologous end-joining (NHEJ). Functions downstream of the MRN complex and ATM, promotes ATR activation and its recruitment to DSBs in the S/G2 phase facilitating the generation of ssDNA. Component of the BRCA1-RBBP8 complex that regulates CHEK1 activation and controls cell cycle G2/M checkpoints on DNA damage (By similarity). During immunoglobulin heavy chain class-switch recombination, promotes microhomology-mediated alternative end joining (A-NHEJ) and plays an essential role in chromosomal translocations. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Homodimer; dimerizes via the coiled coil domain. Interacts (via the PXDLS motif) with CTBP1; the interaction is disrupted via binding of the adenovirus E1A to CTBP1. Component of the BRCA1-RBBP8 complex. Interacts (the Ser-321 phosphorylated form) with BRCA1 (via the C-terminal BRCA1 domains): the interaction occurs in the G2 phase, ubiquitinates RBBP8 and involves RBBP8 in BRCA1-dependent G2/M checkpoint control on DNA damage. Interacts with RB1. Interacts with the MRN complex. Interacts directly with MRE11; the interaction is required for efficient homologous recombination (HR) and regulation of the MRN complex. Interacts directly with RAD50. Interacts directly with NBN. Interacts with SIRT6; the interaction deacetylates RBBP8 upon DNA damage. Interacts with LM04 (via the LIM zinc-binding 1 domain). Interacts with SIAH1. Interacts with RNF138. Interacts with EXD2. Interacts with CUL3 and KLHL15; this interaction leads to RBBP8 proteasomal degradation. Directly interacts with PIN1; this interaction depends upon RBBP8 phosphorylation, predominantly at Thr-309. Interacts with FZR1; this interaction leads to APC/C-mediated RBBP8 proteasomal degradation. Interacts with AUNIP; leading to recruit RBBP8 to sites of DNA damage. Interacts with SAMHD1. UniProt
The PXDLS motif binds to a cleft in CtBP proteins. UniProt
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