PMID- 16260596 OWN - NLM STAT- MEDLINE DCOM- 20051216 LR - 20181113 IS - 0270-7306 (Print) IS - 1098-5549 (Electronic) IS - 0270-7306 (Linking) VI - 25 IP - 22 DP - 2005 Nov TI - Xeroderma pigmentosum complementation group E protein (XPE/DDB2): purification of various complexes of XPE and analyses of their damaged DNA binding and putative DNA repair properties. PG - 9784-92 AB - Xeroderma pigmentosum is characterized by increased sensitivity of the affected individuals to sunlight and light-induced skin cancers and, in some cases, to neurological abnormalities. The disease is caused by a mutation in genes XPA through XPG and the XP variant (XPV) gene. The proteins encoded by the XPA, -B, -C, -D, -F, and -G genes are required for nucleotide excision repair, and the XPV gene encodes DNA polymerase eta, which carries out translesion DNA synthesis. In contrast, the mechanism by which the XPE gene product prevents sunlight-induced cancers is not known. The gene (XPE/DDB2) encodes the small subunit of a heterodimeric DNA binding protein with high affinity to UV-damaged DNA (UV-damaged DNA binding protein [UV-DDB]). The DDB2 protein exists in at least four forms in the cell: monomeric DDB2, DDB1-DDB2 heterodimer (UV-DDB), and as a protein associated with both the Cullin 4A (CUL4A) complex and the COP9 signalosome. To better define the role of DDB2 in the cellular response to DNA damage, we purified all four forms of DDB2 and analyzed their DNA binding properties and their effects on mammalian nucleotide excision repair. We find that DDB2 has an intrinsic damaged DNA binding activity and that under our assay conditions neither DDB2 nor complexes that contain DDB2 (UV-DDB, CUL4A, and COP9) participate in nucleotide excision repair carried out by the six-factor human excision nuclease. FAU - Kulaksiz, Gulnihal AU - Kulaksiz G AD - Biyokimya Anabilim Dali, Hacettepe Universitesi Tip Fakultesi, Ankara, Turkey. FAU - Reardon, Joyce T AU - Reardon JT FAU - Sancar, Aziz AU - Sancar A LA - eng GR - R01 GM032833/GM/NIGMS NIH HHS/United States GR - GM32833/GM/NIGMS NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Mol Cell Biol JT - Molecular and cellular biology JID - 8109087 RN - 0 (DDB2 protein, human) RN - 0 (DNA-Binding Proteins) RN - 0 (Multiprotein Complexes) RN - 9007-49-2 (DNA) RN - EC 2.7.7.7 (DNA-Directed DNA Polymerase) RN - EC 2.7.7.7 (Rad30 protein) RN - EC 3.4.- (Peptide Hydrolases) RN - EC 3.4.19.12 (COP9 Signalosome Complex) SB - IM MH - Animals MH - Apoptosis MH - CHO Cells MH - COP9 Signalosome Complex MH - Cell Cycle MH - Cell Line MH - Chromatography, Affinity MH - Cricetinae MH - DNA/*chemistry MH - *DNA Damage MH - *DNA Repair MH - DNA-Binding Proteins/*genetics/*physiology MH - DNA-Directed DNA Polymerase/chemistry MH - Dimerization MH - Dose-Response Relationship, Drug MH - Humans MH - Insecta MH - Multiprotein Complexes/metabolism MH - Peptide Hydrolases/metabolism MH - Ultraviolet Rays PMC - PMC1280284 EDAT- 2005/11/02 09:00 MHDA- 2005/12/17 09:00 PMCR- 2005/11/01 CRDT- 2005/11/02 09:00 PHST- 2005/11/02 09:00 [pubmed] PHST- 2005/12/17 09:00 [medline] PHST- 2005/11/02 09:00 [entrez] PHST- 2005/11/01 00:00 [pmc-release] AID - 25/22/9784 [pii] AID - 1536-05 [pii] AID - 10.1128/MCB.25.22.9784-9792.2005 [doi] PST - ppublish SO - Mol Cell Biol. 2005 Nov;25(22):9784-92. doi: 10.1128/MCB.25.22.9784-9792.2005.