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![[Figure 1]](ir5007fig1mag.jpg)
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Figure 1
The dinucleotide step is defined by (i) seven backbone torsions, (ii) two torsions around the glycosidic bonds, (iii) one pseudo-torsion angle and (iv) two distances. The atoms involved are (i) δ1, C5′(1)—C4′(1)—C3′(1)—O3′(1); ∊1, C4′(1)—C3′(1)—O3′(1)—P(2); ζ1, C3′(1)—O3′(1)—P(2)—O5′(2); α2, O3′(1)—P(2)—O5′(2)—C5′(2); β2, P(2)—O5′(2)—C5′(2)—C4′(2); γ2, O5′(2)—C5′(2)—C4′(2)—C3′(2); δ2, C5′(2)—C4′(2)—C3′(2)—O3′(2) and (ii) χ1, O4′(1)—C1′(1)—N1/9(1)—C2/4(1); χ2, O4′(2)—C1′(2)—N1/9(2)—C2/4(2). (iii) The pseudo-torsion μ is defined as torsion between the atoms defining the glycosidic bonds of the first and second nucleotides: N1/N9(1)—C1′(1)—C1′(2)—N1/N9(2). (iv) The two distances are N1/9(1)—N1/9(2) and C1′(1)—C1′(2). |
![[Figure 1]](ir5007fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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