Mutant proteins of human dna topoisomerase i

Details Mutant proteins of human dna topoisomerase i Mutant proteins of human dna topoisomerase i

C - Chemistry, Metallurgy

12

N

C12N 9/90 (2006.01)

Patent

CA 2138932

Mutant proteins of human DNA topoisomerase I having an amino acid sequence in which tyrosine at the 592nd position of human DNA topoisomerase I is lacking or replaced with phenylala- nine and which contains at least 30 amino acids in succession of the amino acid sequence subsequent to the 542nd amino acid of human DNA topoisomerase I. Above described mutant proteins react with anti-Scl-70, antibody in the sera of autoimmune disease patients of diffuse scleroderma and can be produced by genetic engineering using E. coli, and therefore they are useful as a diagnostic reagent for scleroderma.

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