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• W2104331876 abstract "Abstract Most fibrous polynucleotides of general sequence exhibit secondary structures that are described adequately by regular helices with a repeated motif of only one nucleotide. Such helices exploit the fact that A:T, T:A, G:C, and C:G pairs are essentially isomorphous and have dyadically-related glycosylic bonds. Polynucleotides with regularly repeated base-sequences sometimes assume secondary structures with larger repeated motifs which reflect these base-sequences. The dinucleotide units of the Z-like forms of poly d(As4T):poly d(As4T), poly d(AC):poly d(GT) and poly d(GC):poly d(GC) are dramatic instances of this phenomenon. The wrinkled B and D forms of poly d(GC):poly d(GC) and poly d(AT):poly d(AT) are just as significant but more subtle examples. It is possible also to trap more exotic secondary structures in which the molecular asymmetric unit is even larger. There is, for example, a tetragonal form of poly d(AT):poly d(AT) which has unit cell dimensions a = b = 1.71nm, c= 7.40nm, γ = 90°. The C dimension corresponds to the pitch of a molecular helix which accommodates 24 successive nucleotide pairs arranged as a 43 helix of hexanucleotide duplexes. The great variety of nucleotide conformations which occur in these large asymmetric units has prompted us to describe them as pleiomeric, a term used in botany to describe whorls having more than the usual number of structures. Pleiomeric DNAs need not contain nucleotide conformations that are very different from one another. On the other hand, DNAs carrying nucleotides of very different conformation must be pleiomeric. This is because 4 nucleotides of different conformation are needed to join patches of secondary structure which are as different as A or B or Z. Differences in nucleotide structures may occur also between chains rather than within chains. In poly d(A):poly d(T), the purine nucleotides all contain Ci'-endo furanose rings and the pyrimidine nucleotides C2 '-endo rings. Analogous heteronomous structures may exist in DNA-RNA hybrids although these duplexes are also found to have symmetrical A-type conformations." @default.
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• W2104331876 date "1983-10-01" @default.
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• W2104331876 title "New Wrinkles on Polynucleotide Duplexes" @default.
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• W2104331876 doi "https://doi.org/10.1080/07391102.1983.10507453" @default.
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