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1tne

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{{STRUCTURE_1tne| PDB=1tne | SCENE= }}
{{STRUCTURE_1tne| PDB=1tne | SCENE= }}
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'''NMR STUDY OF Z-DNA AT PHYSIOLOGICAL SALT CONDITIONS, MINIMIZED AVERAGE STRUCTURE'''
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===NMR STUDY OF Z-DNA AT PHYSIOLOGICAL SALT CONDITIONS, MINIMIZED AVERAGE STRUCTURE===
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==Overview==
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Various oligonucleotides containing 8-methylguanine (m8G) have been synthesized and their structures and thermodynamic properties investigated. Introduction Of M8G into DNA sequences markedly stabilizes the Z conformation under low salt conditions. The hexamer d(CGC[M8G]CG)2 exhibits a CD spectrum characteristic of the Z conformation under physiological salt conditions. The NOE-restrained refinement unequivocally demonstrated that d(CGC[m8G]CG)2 adopts a Z structure with all guanines in the syn conformation. The refined NMR structure is very similar to the Z form crystal structure of d(CGCGCG)2, with a root mean square deviation of 0.6 between the two structures. The contribution of m8G to the stabilization of Z-DNA has been estimated from the mid-point NaCl concentrations for the B-Z transition of various m8G-containing oligomers. The presence of m8G in d(CGC[m8G]CG)2 stabilizes the Z conformation by at least deltaG = -0.8 kcal/mol relative to the unmodified hexamer. The Z conformation was further stabilized by increasing the number of m8Gs incorporated and destabilized by incorporating syn-A or syn-T, found respectively in the (A,T)-containing alternating and non-alternating pyrimidine-purine sequences. The results suggest that the chemically less reactive m8G base is a useful agent for studying molecular interactions of Z-DNA or other DNA structures that incorporate syn-G conformation.
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{{ABSTRACT_PUBMED_8614630}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TNE OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TNE OCA].
==Reference==
==Reference==
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[[Category: Wang, A H.J.]]
[[Category: Wang, A H.J.]]
[[Category: Z-dna]]
[[Category: Z-dna]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:02:51 2008''

Revision as of 23:02, 28 July 2008

Image:1tne.png

Template:STRUCTURE 1tne

NMR STUDY OF Z-DNA AT PHYSIOLOGICAL SALT CONDITIONS, MINIMIZED AVERAGE STRUCTURE

Template:ABSTRACT PUBMED 8614630

About this Structure

Full experimental information is available from OCA.

Reference

Synthesis, structure and thermodynamic properties of 8-methylguanine-containing oligonucleotides: Z-DNA under physiological salt conditions., Sugiyama H, Kawai K, Matsunaga A, Fujimoto K, Saito I, Robinson H, Wang AH, Nucleic Acids Res. 1996 Apr 1;24(7):1272-8. PMID:8614630

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