Characterization of a novel protein that specifically binds to DNA modified by N-acetoxy-acetylaminofluorene and cis-diamminedichloroplatinum

• Autorzy: Pietrowska M. , Widlak P.
• Języki publikacji: EN

Abstrakty

EN

Proteins recognizing DNA damaged by the chemical carcinogen N-acetoxy-acetylaminofluorene (AAAF) were analyzed in nuclear extracts from rat tissues, using a 36 bp oligonucleotide as a substrate and electrophoretic mobility shift and Southwestern blot assays. One major damage-recognizing protein was detected, whose amount was estimated as at least 105 copies per cell. Levels of this protein were similar in extracts from brain, kidney and liver, but much lower in extracts from testis. The affinity of the detected protein for DNA damaged by AAAF was about 70-fold higher than for undamaged DNA. DNA damaged by cis-diamminedichloroplatinum (cis-DDP), benzo(a)pyrene diolepoxide (BPDE) or UV-radiation also bound this protein with an increased affinity, the former more strongly and the latter two more weakly as compared to AAAF-damaged DNA. The detected AAAF/DDP-damaged-DNA-binding (AAAF/DDP-DDB) protein had a molecular mass of about 25 kDa and was distinct from histone H1 or HMGB proteins, which are known to have a high affinity for cis-DDP-damaged DNA. The level of this damage-recognizing protein was not affected in rats treated with the carcinogen 2-acetylaminofluorene. The activity of an AAAF/DDP-DDB protein could also be detected in extracts from mouse liver cells but not from the Hep2G human hepatocellular carcinoma.

Słowa kluczowe

EN

damaged DNA-binding protein; chemical carcinogen; N-acetoxy-acetylaminofluorene; carcinoma; cis-diamminedichloroplatinum; damage recognition; cisplatin; protein; acetylaminofluorene

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2005
• Tom: 52
• Numer: 4
• Opis fizyczny: p.867-874,fig.,ref.

Twórcy

autor

Pietrowska M.

• Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice, Poland

autor

Widlak P.

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