title: Recombinant human O6-alkylguanine-DNA alkyltransferase induces conformational change in bound DNA.
abstract: Circular dichroism, and steady-state and time-resolved fluorescence spectroscopy were used to compare the native recombinant human DNA repair protein O6-alkylguanine-DNA alkyltransferase (AGT) with AGT bound to ds-DNA. Contrary to fluorescence, analysis of the far-UV CD spectra indicated a conformational change of AGT upon binding to DNA: its alpha-helical content is increased by approximately 12%. Analysis of near-UV CD spectra revealed that DNA was also affected, probably being separated into single strands locally.
authors.affiliation: Institute of Cell Biology (Cancer Research) [IFZ], University of Essen Medical School, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Federwisch
authors.forename: U
authors.initials: U
authors.lastname: Hassiepen
authors.forename: K
authors.initials: K
authors.lastname: Bender
authors.forename: M F
authors.initials: MF
authors.lastname: Rajewsky
authors.forename: A
authors.initials: A
authors.lastname: Wollmer
mesh_terms: D000595:Amino Acid Sequence; D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D008780:Methyltransferases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D019853:O(6)-Methylguanine-DNA Methyltransferase; D011487:Protein Conformation; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D013050:Spectrometry, Fluorescence
chemical_list: D011994:Recombinant Proteins; D004247:DNA; D008780:Methyltransferases; D019853:O(6)-Methylguanine-DNA Methyltransferase