Myotonic dystrophy type 1 (Steinert's disease) is a multisystem disorder with autosomal dominant inheritance. This disease is associated with the presence of an abnormal expansion of a cytosine thymine-guanine (CTG) trinucleotide repeat on chromosome 19q13.3. Because of rhythmic complications, the place for systematic electrophysiological study (EPS) has to be discussed.

The base composition of RNA from individually isolated giant chromosomes, puffed chromosome segments, nucleoli, and samples of cytoplasm from Chironomus salivary gland cells was determined by microelectrophoresis. Data on the adenine: guanine quotient of the chromosomal DNA were also obtained. The results show that: 1) Chromosomal, nucleolar, and cytoplasmic RNA's differ significantly from each...

The total interaction energies of altogether 15 hydrogen-bonded nucleic acid base pairs containing unusual base tautomers were calculated. The geometry properties of all selected adenine-thymine and guanine-cytosine hydrogen-bonded base pairs enable their incorporation into DNA. Unusual base pairing patterns were compared with Watson-Crick H-bonded structures of the adenine-thymine and guanine-...

Escherichia coli tRNA(Val) with pyrimidine substitutions for the universally conserved 3'-terminal adenine can be readily aminoacylated. It cannot, however, transfer valine into polypeptides. Conversely, despite being a poor substrate for valyl-tRNA synthetase, tRNA(Val) with a 3'-terminal guanine is active in in vitro polypeptide synthesis. To better understand the function of the 3'-CCA seque...

Both deoxyribonucleic and ribonucleic acids appear to possess a secondary structure, by virtue of the fact that the purine and pyrimidine bases can undergo hydrogen bonding with each other. In the case of DNA, this secondary structure takes the form of a long, highly ordered helix composed of two strands held to each other by hydrogen bonds between the bases (l-3). The secondary structure of RN...

We report a systematic solid-state (17)O NMR study of free nucleic acid bases: thymine (T), uracil (U), cytosine (C), and guanine (G). Site-specifically (17)O-enriched samples were synthesized:[2-(17)O]thymine (1), [4-(17)O]thymine (2), [2-(17)O]uracil (3), [4-(17)O]uracil (4), [2-(17)O]cytosine (5), and [6-(17)O]guanine monohydrate (6). Magic-angle-spinning (MAS) and static (17)O NMR spectra w...

Zika virus (ZIKV) spread led to the recent medical health emergency of international concern. Understanding the variations in virus system is of utmost need. Using available complete sequences of ZIKV we estimated directions of mutational pressure along the length of consensus sequences of three lineages of the virus. Results showed that guanine usage is growing in ZIKV RNA plus strand due to a...

Clostridium hydroxybenzoicum JW/Z-1T (= ATCC 51151 = DSM 7310)) (T = type strain), isolated from freshwater pond sediment, is a nonmotile, gram type-positive, spore-forming, amino acid-utilizing, anaerobic rod. This bacterium produces two inducible enzymes that catalyze the decarboxylation of para-hydroxybenzoates. The phenols produced are not utilized. C. hydroxybenzoicum requires yeast extrac...

Estimates have been made of the main contributions of the heterocyclic bases of DNA to the free energies of the two configurations in solution, the two-stranded helix and the single-strand random coil. The magnitude and directions of the dipole moments of the adenine, thymine, guanine and cytosine base groups have been calculated by a semi-empirical molecular orbital treatment. Dipole-dipole, d...

Previous studies in our laboratory identified a negative regulatory domain in the 5'-flanking region of the human CYP1A1 gene containing two negative regulatory elements (NRE). Characterization of one of these elements revealed three nuclear protein binding regions: a 21-bp palindrome with a point of symmetry at -784 and two guanine- and cytosine-rich elements that flank the palindrome. Functio...