Fragments of a Proline-Rich Polypeptide Settled on a Hexapeptide Carcass Constructed of Glycine and L-Lysine Residues : Synthesis and Biological Properties

Proline-rich polypeptide fragments settled on a hexapeptide constructed od L-lysine and glycine residues were synthesized by the solid phase method: X-Lys(X)-Gly-Lys(X)-Gly-Lys(X)-Gly-OH, X= Tyr-Val-Pro-Leu-Phe-Pro and Y-Lys(Y)-Gly-Lys(Y)-Gly-Lys(Y)-Gly-OH, Y=Val-Glu-Ser-Tyr-Val-Pro-Leu-Phe-Pro. Imunotropic activity of the analogues was determined in a murine syste using resistance to hydrocortisone and in human cell cultures using induction of cytokines as indicators.