Ia BRONSHTEIN

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Blood sera of patients with autoimmune diseases scleroderma (Scl), systemic lupus erythematosus (SLE), and rheumatoid arthritis (RA) have been shown to yield a specific immune response to topoisomerase I, the product of expression of a cDNA fragment cloned into lambda gt11 and monoclonal antibodies (MAB) to the enzyme. The 'topoisomerase test' is not(More)
A new DNAase was isolated from unfertilized loach eggs. The enzyme is activated by bivalent metal ions (Mg2+, Ca2+, Mn2+) and is inhibited by Na+ and N-ethylmaleimide. The maximal activity of DNAase lies within the pH range of 9.0-9.5. The enzyme is thermostable and predominantly hydrolyzes the two-chain DNA by producing one-chain ruptures. The DNAase(More)
Immunoscreening of the human placenta cDNA-library in the expression vector lambda gt11 using non-isotope detection based on the avidin-biotin system allowed to identify a number of clones encoding human topoisomerase I. The fusion protein from an extract of Escherichia coli cells infected with the recombinant phage lambda gt11 interacts with the monoclonal(More)
disturbance in denervated liver cells to activation of DNA-tropic factors. The experimental results suggest that on the 30th day after vagotomy (Fig. lc) there is a tendency for the chromatin to return to its original state. This view is supported by the closeness of the character of dependence of the relative viscosity of the chromatin on concentration of(More)
Nucleotide sequences that are cleaved by calf thymus type I topoisomerase have been determined using cloned human Ha-ras and p53 genes. Localization and relative frequency of single-strand cleavages within these sequences were observed to change in the presence of the cytotoxic alkaloid camptothecin.
The interaction of sera from 34 patients with different autoimmune diseases with the expressed fusion protein cloned in lambda gt11 vector (topoisomerase I--beta galactosidase) and monoclonal antibodies against enzyme was studied. It was demonstrated that 100% of Scl cases possessed positive activity against fusion protein. It was shown that this test is(More)