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• W1970725902 abstract "The crystal structure of a left‐handed Z‐DNA hexamer, d(CG) 3 in complex with a synthetic polyamine, N 1 ‐[2‐(2‐amino‐ethylamino)‐ethyl]‐ethane‐1,2‐diamine, NH 3 + ‐(CH 2 ) 2 ‐NH 2 + ‐(CH 2 ) 2 ‐NH 2 + ‐(CH 2 ) 2 ‐NH 3 + [PA(222)], has been determined by the X‐ray diffraction method at 1.0 Å resolution. In an orthorhombic crystal, the d(CG) 3 duplex binds two PA(222) molecules, and this synthetic polyamine exhibits dual conformational properties. One of the two PA(222) molecules resides on the floor of the minor groove of a Z‐DNA duplex and imino groups bridge the two phosphate chains across a double helix, while the terminal amino groups link the oxygen atoms O2 of four cytosine bases. This PA(222) molecule makes a U‐turn like a fishhook at one of its ends to provide a micro‐environmental network previously unseen in complexes of DNA with polyamines. The width of the minor groove does not become considerably greater with the looped end of the polyamine, indicating conformational rigidity of the Z‐DNA backbone imposed by the high stacking energy of the GC base pairs. While polyamine binding to the minor groove has been postulated by theoretical studies for stabilizing the Z‐DNA double helical conformation, the finding in the crystal of the looped polyamine chain binding the minor groove of Z‐DNA is observed for the first time from the data collected at 10°C (so‐called room temperature data). Another PA(222) molecule binds on the convex outer surface of the major groove of the Z‐DNA duplex and links three d(CG) 3 duplexes which are symmetrically related to each other. The structure of this PA(222) presents the previously reported zig‐zag type conformation [Egli et al., Biochemistry 30 (1991) 11388–11402]. Comparison of this structure with other polyamine–DNA cocrystals reveals structural themes and differences that may relate to the length of the polyamine." @default.
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• W1970725902 date "2002-06-12" @default.
• W1970725902 modified "2023-10-17" @default.
• W1970725902 title "The crystal structure of<i>N</i>¹-[2-(2-amino-ethylamino)-ethyl]-ethane-1,2-diamine (polyamines) binding to the minor groove of d(CGCGCG)₂, hexamer at room temperature" @default.
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• W1970725902 doi "https://doi.org/10.1016/s0014-5793(02)02922-8" @default.
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