| Abstract: | Three basic proline-rich peptides were newly isolated from human parotid saliva, and designated as P-G, P-H, and P-I. The amino acid sequence of P-H was determined to be Ser-Pro-Pro-Gly-Lys-Pro-Gln-Gly-Pro-Pro-Gln-Gln-Glu-Gly-Asn-Asn- Pro-Gln-Gly-Pro-Pro-Pro-Pro-Ala-Gly-Gly-Asn-Pro-Gln-Gln-Pro-Gln-Ala-Pro-Pro- Ala-Gly-Gln-Pro-Gln-Gly-Pro-Pro-Arg-Pro-Pro-Gln-Gly-Gly-Arg-Pro-Ser-Arg-Pro- Pro-Gln by conventional methods. The amino terminal ten residues of P-H were the same as those of proline-rich peptides P-D, P-E, and P-F reported previously. Comparison of the amino acid sequences between P-H and P-D revealed that there are two deletion parts and several amino acid substitutions in the sequence of P-H. Homology between P-H and P-D was as high as 70%. |
