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dApT, a modified deoxyribose dinucleoside phosphate with an uncharged methylphosphonate group, crystallizes as dihydrate in space group P2(1)2(1)2, a = 9.629(3), b = 20.884(6) and c = 14.173(4)A, Z = 4. The structure has been determined using 2176 X-ray diffractometer reflections and refined to a final R of 0.105. Torsion angles about P-O(5') and P-O(3') bonds are -91.8 degrees and 117.8 degrees. The former is in the normal (-)gauche range while the latter is eclipsed. Bases are oriented anti, the sugar of adenosine is puckered 2T3 (C(2')endo) whereas that of thymidine displays puckering disorder with major and minor occupancy sites. Major site is a half-chair 2T (C(2')endo-C(1')exo) and minor site an envelope 3T2 (C(3(1)endo). Adenine and thymine bases of symmetry related molecules form reversed Hoogsteen type base pairs, water molecules are disordered in the crystal lattice.

nucleic acids research

Molecular structure of deoxyadenjlyl–3′–methylphosphonate–5′thymldine dlhydrate, (d-ApT-2H<sub>2</sub>O), a dinudeodde monophosphate with neutral pbosphodiester backbone. An X-ray crystal study

Molecular structure of deoxyadenjlyl–3′–methylphosphonate–5′thymldine dlhydrate, (d-ApT-2H2O), a dinudeodde monophosphate with neutral pbosphodiester backbone. An X-ray crystal study

Molecular structure of deoxyadenjlyl–3′–methylphosphonate–5′thymldine dlhydrate, (d-ApT-2H₂O), a dinudeodde monophosphate with neutral pbosphodiester backbone. An X-ray crystal study