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THE UNUSUAL STRUCTURE OF THE HUMAN CENTROMERE (GGA)2 MOTIF: UNPAIRED GUANOSINE RESIDUES STACKED BETWEEN SHEARED G(DOT)A PAIRS
SOLUTION NMR
NMR Refinement
Method
Details
Software
R VALUE 0.250 FINAL RMS COORD. SHIFT 0.65 ANGSTROMS NUMBER OF ATOMS USED IN REFINEMENT. NUMBER OF PROTEIN ATOMS 0 NUMBER OF NUCLEIC ACID ATOMS 772 NUMBER OF HETEROGEN ATOMS 0 NUMBER OF SOLVENT ATOMS 0. THE DUPLEX CONTAINS UNPAIRED STAGGERED GUANOSINE RESIDUES, WHICH CO-STACK BY INTERCALATION BETWEEN SHEARED G(DOT)A AND A(DOT)G BASE-PAIRS TO FORM AN INTERESTING NEW STRUCTURAL MOTIF, THE GA-BRACKETED G-STACK. THE TGGAA REPEAT UNIT CONTAINS SIX "STEPS", FOUR OF WHICH ARE NOT WATSON-CRICK BASE-PAIRS.