List of 55 fiber structures id# Twist Rise Structure description (degrees) (A) ------------------------------------------------------------------------------- 1 32.7 2.548 A-DNA (calf thymus; generic sequence: A, C, G and T) 2 65.5 5.095 A-DNA poly d(ABr5U) : poly d(ABr5U) 3 0.0 28.030 A-DNA (calf thymus) poly d(A1T2C3G4G5A6A7T8G9G10T11) : poly d(A1C2C3A4T5T6C7C8G9A10T11) 4 36.0 3.375 B-DNA (calf thymus; generic sequence: A, C, G and T) 5 72.0 6.720 B-DNA poly d(CG) : poly d(CG) 6 180.0 16.864 B-DNA (calf thymus) poly d(C1C2C3C4C5) : poly d(G6G7G8G9G10) 7 38.6 3.310 C-DNA (calf thymus; generic sequence: A, C, G and T) 8 40.0 3.312 C-DNA poly d(GGT) : poly d(ACC) 9 120.0 9.937 C-DNA poly d(G1G2T3) : poly d(A4C5C6) 10 80.0 6.467 C-DNA poly d(AG) : poly d(CT) 11 80.0 6.467 C-DNA poly d(A1G2) : poly d(C3T4) 12 45.0 3.013 D-DNA poly d(AAT) : poly d(ATT) 13 90.0 6.125 D-DNA poly d(CI) : poly d(CI) 14 -90.0 18.500 D-DNA poly d(A1T2A3T4A5T6) : poly d(A1T2A3T4A5T6) 15 -60.0 7.250 Z-DNA poly d(GC) : poly d(GC) 16 -51.4 7.571 Z-DNA poly d(As4T) : poly d(As4T) 17 0.0 10.200 L-DNA (calf thymus) poly d(GC) : poly d(GC) 18 36.0 3.230 B'-DNA alpha poly d(A) : poly d(T) (H-DNA) 19 36.0 3.233 B'-DNA beta2 poly d(A) : poly d(T) (H-DNA beta) 20 32.7 2.812 A-RNA poly (A) : poly (U) 21 30.0 3.000 A'-RNA poly (I) : poly (C) 22 32.7 2.560 Hybrid poly (A) : poly d(T) 23 32.0 2.780 Hybrid poly d(G) : poly (C) 24 36.0 3.130 Hybrid poly d(I) : poly (C) 25 32.7 3.060 Hybrid poly d(A) : poly (U) 26 36.0 3.010 10-fold poly (X) : poly (X) 27 32.7 2.518 11-fold poly (X) : poly (X) 28 32.7 2.596 Poly (s2U) : poly (s2U) (symmetric base-pair) 29 32.7 2.596 Poly (s2U) : poly (s2U) (asymmetric base-pair) 30 32.7 3.160 Poly d(C) : poly d(I) : poly d(C) 31 30.0 3.260 Poly d(T) : poly d(A) : poly d(T) 32 32.7 3.040 Poly (U) : poly (A) : poly(U) (11-fold) 33 30.0 3.040 Poly (U) : poly (A) : poly(U) (12-fold) 34 30.0 3.290 Poly (I) : poly (A) : poly(I) 35 31.3 3.410 Poly (I) : poly (I) : poly(I) : poly(I) 36 60.0 3.155 Poly (C) or poly (mC) or poly (eC) 37 36.0 3.200 B'-DNA beta2 Poly d(A) : poly d(U) 38 36.0 3.240 B'-DNA beta1 Poly d(A) : poly d(T) 39 72.0 6.480 B'-DNA beta2 Poly d(AI) : poly d(CT) 40 72.0 6.460 B'-DNA beta1 Poly d(AI) : poly d(CT) 41 144.0 13.540 B'-DNA Poly d(AATT) : poly d(AATT) 42 32.7 3.040 Poly(U) : poly d(A) : poly(U) [cf. #32] 43 36.0 3.200 Beta Poly d(A) : Poly d(U) [cf. #37] 44 36.0 3.233 Poly d(A) : poly d(T) (Ca salt) 45 36.0 3.233 Poly d(A) : poly d(T) (Na salt) 46 36.0 3.38 B-DNA (BI-type nucleotides; generic sequence: A, C, G and T) 47 40.0 3.32 C-DNA (BII-type nucleotides; generic sequence: A, C, G and T) 48 87.8 6.02 D(A)-DNA poly d(AT) : poly d(AT) (right-handed) 49 60.0 7.20 S-DNA poly d(CG) : poly d(CG) (C_BG_A, right-handed) 50 60.0 7.20 S-DNA poly d(GC) : poly d(GC) (C_AG_B, right-handed) 51 31.6 3.22 B*-DNA poly d(A) : poly d(T) 52 90.0 6.06 D(B)-DNA poly d(AT) : poly d(AT) [cf. #48] 53 -38.7 3.29 C-DNA (generic sequence: A, C, G and T) (depreciated) 54 32.73 2.56 A-DNA (generic sequence: A, C, G and T) [cf. #1] 55 36.0 3.39 B-DNA (generic sequence: A, C, G and T) [cf. #4] ------------------------------------------------------------------------------- List 1-41 based on Struther Arnott: ``Polynucleotide secondary structures: an historical perspective'', pp. 1-38 in ``Oxford Handbook of Nucleic Acid Structure'' edited by Stephen Neidle (Oxford Press, 1999). #42 and #43 are from Chandrasekaran & Arnott: "The Structures of DNA and RNA Helices in Oriented Fibers", pp 31-170 in "Landolt-Bornstein Numerical Data and Functional Relationships in Science and Technology" edited by W. Saenger (Springer-Verlag, 1990). #44-#45 based on Alexeev et al., ``The structure of poly(dA) . poly(dT) as revealed by an X-ray fiber diffraction''. J. Biomol. Str. Dyn, 4, pp. 989-1011, 1987. #46-#47 based on van Dam & Levitt, ``BII nucleotides in the B and C forms of natural-sequence polymeric DNA: a new model for the C form of DNA''. J. Mol. Biol., 304, pp. 541-561, 2000. #48-#55 based on Premilat & Albiser, ``A new D-DNA form of poly(dA-dT) . poly(dA-dT): an A-DNA type structure with reversed Hoogsteen Pairing''. Eur. Biophys. J., 30, pp. 404-410, 2001 (and several other publications).