Nuclear transport of human DDB protein induced by ultraviolet light

Wei Liu, Anne F. Nichols, Jay A. Graham, Rachel Dualan, Alex Abbas, Stuart Linn

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


Human damage-specific DNA-binding (DDB) protein can be purified as a heterodimer (p48 and p127) that binds to DNA damaged by ultraviolet light. We report here the effects of UV irradiation on the cellular localization of each DDB subunit as a function of time using green fluorescent fusion proteins in three diploid fibroblast strains: repair-proficient IMR-90 and two repair-deficient xeroderma pigmentosum group E strains (XP95TO and XP3RO). Although p48 remained in the nucleus after UV irradiation, a dynamic nuclear accumulation of p127 from the cytoplasm was found after 24 h. In IMR- 90 cells, the nuclear localization of p127 corresponded to the up-regulation of p48 mRNA and protein levels and of DDB activity. XP3RO cells showed delayed but similar kinetics with less transport, whereas XP95TO cells appeared to have different kinetics, suggesting that these cells exhibit different defects in p127 translocation. We propose that p48 might act as the transporter for nuclear entry of p127 but that a third factor might be necessary for efficient transportation.

Original languageEnglish (US)
Pages (from-to)21429-21434
Number of pages6
JournalJournal of Biological Chemistry
Issue number28
StatePublished - Jul 14 2000
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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