Methylene blue intercalates with triplex poly(dT)*poly(dA)·poly(dT) but not duplex poly(dA)·poly(dT)
Abstract
Methylene blue intercalates with triplex poly(dT*dA·dT) even though it binds to the precursor duplex poly(dA·dT) in the major groove; the switch may be related to conformational modifications of the polynucleotide structure upon binding of the third strand.