Anti-sense peptide recognition of sense peptides: direct quantitative characterization with the ribonuclease...

The ability of peptides coded by the anti-sense strand of DNA to interact specifically with peptides coded by the sense strand has been evaluated. The sense peptide examined, ribonuclease S-peptide, was immobilized on a coated silica affinity chromatographic matrix. Anti-sense peptides were synthesized on the basis of the anti-sense DNA sequence for the S-peptide region in native pancreatic ribonuclease A. The interaction of synthetic anti-sense peptides with sense peptide was quantitated from the degree of retardation during chromatographic elution on the sense peptide affinity matrix in buffers with and without soluble competing sense peptide. Sense/anti-sense peptide interactions were found to occur with significant affinities with each of two anti-sense 20-residue peptides of opposite amino-to-carboxyl orientations and to weaken progressively with decreasing length of anti-sense peptide. The substantial chromatographic retardation of anti-sense peptides was specific, since it decreased as expected with increasing concentration of the soluble competing S-peptide, could not be mimicked by the elution of several control peptides (including S-peptide itself) on the S-peptide matrix, and did not occur with a blank chromatographic matrix (no S-peptide attached). The stoichiometry of anti-sense peptide binding to immobilized sense peptide was found to be far greater than 1:1, and at least 4-5:1, for the two 20-mer anti-sense peptides. In sum, the analytical affinity chromatographic experiments have established quantitatively that anti-sense peptide binding to sense peptides occurs in the ribonuclease S-peptide case and have identified some structural elements that govern these interactions.(ABSTRACT TRUNCATED AT 250 WORDS)