Table 23.3.2.1

Dickerson, R. E.

doi:10.1107/97809553602060000716

International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

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International Tables for Crystallography (2006). Vol. F. ch. 23.3, p. 593 | 1 | 2 |

Table 23.3.2.1

R. E. Dickerson^a ^*

^a Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095–1570, USA
Correspondence e-mail: red@mbi.ucla.edu

Table 23.3.2.1 | top | pdf |
Average torsion-angle properties of A-, B- and Z-DNA (°)

Values listed are mean torsion angles, with standard deviations in parentheses. Conformations are only approximate; — indicates a non-gauche/trans conformation. B_II and Z_II are less common variants. For δ, the sugar ring geometry is quoted in place of gauche/trans. χ for B-DNA combines pyrimidines and purines. Values were obtained from a sample of 30 A-DNAs, 34 B-DNAs, 22 Z-DNAs and ten nonstandard DNAs in the Nucleic Acid Database. From Schneider et al. (1997).

	$[\alpha]$	$[\beta]$	$[\gamma]$	$[\delta]$	$[\varepsilon]$	$[\zeta]$	$[\chi]$
A-DNA	293 (17)	174 (14)	56 (14)	81 (7)	203 (12)	289 (12)	199 (8)
Conformation	g ⁻	t	g ⁺	C3′-endo	t	g ⁻	t
B-DNA	298 (15)	176 (9)	48 (11)	128 (13)	184 (11)	265 (10)	249 (16)
Conformation	g ⁻	t	g ⁺	C1′-exo	t	g ⁻	g ⁻

B_II-DNA		146 (8)		144 (7)	246 (15)	174 (14)	271 (8)
Conformation		—		C2′-endo	g ⁻	t	g ⁻
Z_I-DNA – purines	71 (13)	183 (9)	179 (9)	95 (8)	95 (8)	301 (16)	63 (5)
Conformation	g ⁺	t	t	O4′-endo	g ⁺	g ⁻	g ⁺

Z_II-DNA – purines					189 (12)	52 (14)	58 (5)
Conformation					t	g ⁺	g ⁺

Z_I-DNA – pyrimidines	201 (20)	225 (16)	54 (13)	141 (8)	267 (9)	75 (9)	204 (98)
Conformation	t	—	g ⁺	C2′-endo	g ⁻	g ⁺	t

Z_II-DNA – pyrimidines	168 (16)	166 (14)
Conformation	t	t