The development of a novel solvent-partition method for measuring the interaction between nucleic acids and drugs of limited water solubility is described. Factors relevant to the choice of a suitable water-immiscible solvent are summarised. i-Amyl acetate was selected for studying the binding o...detailed
Acid hydrolysis of Triostin C proved that the constituents were quinoxaline-2-carboxylic acid (2 moles), d-serine (2 moles), l-alanine (2 moles), N,N′-dimethyl-l-cystine (1 mole), and N,γ-dimethyl-l-alloisoleucine (2 moles). The sequence was proved to be in the order given above and lactone li...detailed
Six or seven triostin-binding sites have been identified in a 160-base-pair DNA restriction fragment containing the tyr T promoter sequence. Each is centred round a CpG step, and the minimum binding site-size appears to be six base pairs. The sites are practically the same as those reported for ...detailed
Triostin A exists as two symmetrical conformers in weakly polar solvents like chloroform. Adenine and guanine derivatives were found to specifically interact with one of the two conformers, but uracil and cytosine derivatives did not. From the analysis of nmr and infrared spectra, it was conclud...detailed
SummaryExcised thioesterase domains are versatile catalysts for macrocyclization. However, thioesterase-catalyzed cyclization is often precluded due to the occurrence of hydrolysis and product inhibition. To circumvent these obstacles, we devised an unprecedented strategy: coincubation with DNA ...detailed
The binding kinetics of the intercalative binding of Triostin A to λ-DNA was investigated by measuring the force extension response of the DNA-ligand complexes with an optical tweezers system. These force response curves, containing the information about different binding properties, were analy...detailed