摘要:
A novel diamino/dicationic polyamide f-Im*PyIm (5) that contains an orthogonally positioned aminopropyl chain on an imidazole (Im*) moiety was designed to target 5'-ACGCGT-3'. The DNA binding properties of the diamino polyamide 5, determined by CD, Delta T-M, DNase I footprinting, SPR, and ITC studies, were compared with those of its monoamino/monocationic counterpart f-ImPyIm (1) and its diamino/dicationic isomer f-ImPy*Im (2), which has the aminopropyl group attached to the central pyrrole unit (Py*). The results gave evidence for the minor groove binding and selectivity of polyamide 5 for the cognate sequence 5'-ACGCGT-3', and with strong affinity (K-eq = 2.3 x 10(7) M-1). However, the binding affinities varied according to the order: f-ImPy*Im (2) > f-ImPyIm (1) >= f-Im*PyIm (5) confirming that the second amino group can improve affinity, but its position within the polyamide can affect affinity. (C) 2012 Elsevier Ltd. All rights reserved.