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SOLUTION STRUCTURES OF THE I-MOTIF TETRAMERS OF D(TCC), D(5MCCT) AND D(T5MCC). NOVEL NOE CONNECTIONS BETWEEN AMINO PROTONS AND SUGAR PROTONS
SOLUTION NMR
NMR Refinement
Method
Details
Software
THE STRUCTURE IS FORMED OF FOUR EQUIVALENT TCC STRANDS DESIGNATED A, B, C, D. STRANDS A AND C, CONNECTED BY TWO HEMI-PROTONATED BASE PAIRS (C2.C2+ AND C3.C3+), FORM A PARALLEL-STRANDED DUPLEX. THE RELATION BETWEEN STRANDS B AND D IS THE SAME AS THAT BETWEEN STRANDS A AND C. THE STRANDS OF EACH DUPLEX ARE RELATED BY A LONGITUDINAL TWO-FOLD SYMMETRY AXIS. THE DUPLEXES HAVE THE SAME LONGITUDINAL AXIS, AND THEY ARE ANTI-PARALLEL. THEIR HEMI-PROTONATED C.C+ BASE PAIRS ARE INTERCALATED FACE-TO-FACE. THE DUPLEXES CAN BE TRANSFORMED INTO ONE ANOTHER BY A 180 DEGREE ROTATION AROUND A TWO-FOLD AXIS PERPENDICULAR TO THE LONGITUDINAL AXIS, AND CONSEQUENTLY AROUND A THIRD AXIS PERPENDICULAR TO THE FIRST TWO. THE H3 IMINO PROTONS OF THE HEMI-PROTONATED C.C+ PAIRS WERE NOT INCORPORATED IN THE COMPUTATIONS.