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Trypsin- und Chymotrypsin-Inhibitoren in Leguminosen

VII. Partialsequeuzen des Trypsin-Chymotrypsin-Inhibitors PCI 3 aus Phaseolus coccineus

Trypsin and chymotrypsin inhibitors in leguminosae

VII. Partial amino acid sequences of the trypsin chymotrypsin inhibitor PCI 3 from Phaseolus coccineus

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Summary

The sequences of amino acid residues at the amino and carboxyl terminus and around the reactive sites of the trypsin chymotrypsin inhibitor PCI 3 from the seeds of runner beans (Phaseolus coccineus L.) were estimated by aminopeptidase O and carboxypeptidase A degradation before and after enzymatical modification with trypsin or chymotrypsin. Beginning at the amino terminus the sequences are: Ser-Glu-Ala-Gly-Gln-..., ...-Ile-Tyr-Lys-Ser-Gln-(Pro)-... with Lys-Ser as reactive site against trypsin, ...-Asp-Val-Ala-Leu-Ser-(Pro)-... with Leu-Ser as reactive site againstα-chymotrypsin, and ...-Thr-Arg-Ala-Lys-Phe-Leu as C-terminus. The importance of the serine residue in the reactive sites concerning the specificity of inhibitors is dicussed.

Zusammenfassung

Die Aminosäuresequenzen am N- und C-Terminus und um die reaktiven Zentren des Trypsin-Chymotrypsin-Inhibitors PCI 3 aus den Samen von Feuerbohnen (Phaseolus coccineus L.) wurden durch Abbau mit Aminopeptidase O und Carboxypeptidase A vor und nach der enzymatischen Modifizierung mit Trypsin oder Chymotrypsin bestimmt. Beginnend am N-Terminus wurden folgende Sequenzen gefunden: Ser-Glu-Ala-Gly-Gln..., ...-Ile-Tyr-Lys-Ser-Gln-(Pro)-... mit Lys-Ser als reaktivem Zentrum gegen Trypsin, ...-Asp-Val-Ala-Leu-Ser-(Pro)-... mit Leu-Ser als reaktivem Zentrum gegenα-Chymotrypsin und ...-Thr-Arg-Ala-Lys-Phe-Leu als C-Terminus. Die Bedeutung des Serinrestes in den reaktiven Zentren für die Spezifität der Inhibitoren wird diskutiert.

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Hory, HD., Weder, J.K.P. Trypsin- und Chymotrypsin-Inhibitoren in Leguminosen. Z Lebensm Unters Forch 162, 349–356 (1976). https://doi.org/10.1007/BF01122787

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  • DOI: https://doi.org/10.1007/BF01122787

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