A 127 kDa component of a UV-damaged DNA-binding complex, which is defective in some xeroderma pigmentosum group E patients, is homologous to a slime mold protein - PubMed (original) (raw)

A 127 kDa component of a UV-damaged DNA-binding complex, which is defective in some xeroderma pigmentosum group E patients, is homologous to a slime mold protein

M Takao et al. Nucleic Acids Res. 1993.

Free PMC article

Abstract

A cDNA which encodes a approximately 127 kDa UV-damaged DNA-binding (UV-DDB) protein with high affinity for (6-4)pyrimidine dimers [Abramic', M., Levine, A.S. & Protic', M., J. Biol. Chem. 266: 22493-22500, 1991] has been isolated from a monkey cell cDNA library. The presence of this protein in complexes bound to UV-damaged DNA was confirmed by immunoblotting. The human cognate of the UV-DDB gene was localized to chromosome 11. UV-DDB mRNA was expressed in all human tissues examined, including cells from two patients with xeroderma pigmentosum (group E) that are deficient in UV-DDB activity, which suggests that the binding defect in these cells may reside in a dysfunctional UV-DDB protein. Database searches have revealed significant homology of the UV-DDB protein sequence with partial sequences of yet uncharacterized proteins from Dictyostelium discoideum (44% identity over 529 amino acids) and Oryza sativa (54% identity over 74 residues). According to our results, the UV-DDB polypeptide belongs to a highly conserved, structurally novel family of proteins that may be involved in the early steps of the UV response, e.g., DNA damage recognition.

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