Studies on the combining sites of the protein antigen silk fibroin. III. Inhibition of the silk fibroin-antifibroin system by peptides derived from the antigen.

For the study of its combining sites with antibody, silk fibroin was prepared by solution in lithium bromide, followed by dialysis. The fibroin had a molecular weight of 50,000–60,000 and contained only a slight amount of contaminants by immunologic assay. The number of antigenic sites occupied by antibody at equivalence varied with the rabbit immune serum but in most cases ranged from 2.6 to 3.2. The peptides in the soluble fraction following chymotryptic hydrolysis of fibroin were able to produce essentially complete inhibition of the fibroin-rabbit-antifibroin precipitin reaction at a concentration of 130 to 160 μm N per ml. Dialyzable peptides possessed differential inhibitory activity as shown by testing fractions obtained by partition column chromatography.

• Publication year

  1961

• Venue

  Journal of Immunology

• Publication date

  1961-02-01

• Fields of study

  Biology, Medicine, Materials Science, Chemistry

• Identifiers
  DOI 10.4049/jimmunol.86.2.190PMID 13691814
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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