plexes of amines and cyclic amines used as DNA cleavage agents have been reported. These compounds generally contain heterocycles or polycyclic aromatic rings tethered to one or more aminoalkyl side chains, and are complexed with transition metals known to play important roles in DNA cleavage reactions. Many studies on the role of 2,4 -bithiazole, which constitutes a part of the C-terminus of B...

Bleomycins constitute a widely studied class of complex DNA cleaving natural products that are used to treat various cancers. Since their first isolation, the bleomycins have provided a paradigm for the development and discovery of additional DNA-cleaving chemotherapeutic agents. The bleomycins consist of a disaccharide-modified metal-binding domain connected to a bithiazole/C-terminal tail via...

A family of stable and soluble bithiazole-centered heterocyclic aromatic fluorescent compounds is described herein. All these multiple N-donor containing compounds have effective π-conjugated systems and different imidazole, pyridine, thiophene, triphenylamino, benzoic acid, and ethyl benzoate tails showing distinguishable D-A-A-D and A-A-A-A structures. X-ray single-crystal structures of seven...

Better correctors are needed to repair cystic fibrosis transmembrane conductance regulator (CFTR) processing mutants that cause cystic fibrosis. Determining where the correctors bind to CFTR would aid in the development of new correctors. A recent study reported that the second nucleotide-binding domain (NBD2) was involved in binding of bithiazole correctors. Here, we show that bithiazole corre...

It has been shown previously that two structural domains of bleomycin mediate the interaction of the antitumor antibiotic with DNA. At least three lines of evidence indicate that the metal binding domain is the predominant partner, and is responsible for the sequence selectivity of DNA cleavage observed for Fe(II)*BLM. The bithiazole + C-terminus has been shown previously to bind to DNA, but no...

Copper(II)  complex  [Cu(dmbt)2(H2O)](ClO4)2 (1)  was  prepared  from  the  reaction  of  copper(II) perchlorate  hexahydrate  with  2,2'-dimethyl-4,4'-bithiazole  (dmbt)  ligand  in  methanol  at  ambient temperature. The complex was quantitatively and qualitatively characterized by elemental analysis, absorption  and  infrared  spectrometries.  Complex  [Cu(DMSO)5](ClO4)2 (2)  was  also  synt...

Three simple-structure non-fused-ring SMAs with an A w (?–A) 2 architecture using bithiazole as the central unit was synthesized.

Density functional theory calculations were performed on 2,2'-diphenyl-5,5'-bithiazole (DPBT) and its derivatives. The dimer structures of the title compounds were optimized by a density functional theory method with dispersion energy being considered at the wB97XD/LanL2DZ level. Reorganization energies between the switch of neutral molecules and anion radicals, and the electron-transfer coupli...

The bleomycins (BLMs) are natural products that in the presence of iron and oxygen bind to and cause single-strand and double-strand cleavage of DNA. The mode(s) of binding of the FeBLMs that leads to sequence-specific cleavage at pyrimidines 3' to guanines and chemical-specific cleavage at the C-4' H of the deoxyribose of the pyrimidine has remained controversial. 2D NMR studies using the hydr...

There are several lines of evidence indicating that the DNA-cleaving activity of bleomycin determines its cytotoxicity. (1) Most bleomycin analogs and derivatives which degrade isolated DNA are also active against living cells and vice versal) ; (2) some bacterial mutants selected for sensitivity to bleomycin lacked DNA-repair systems',') ; and (3) more degradation of DNA was observed in cells ...