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Synthesis and Functional Characterization of Tridegin and Its Analogues: Inhibitors and Substrates of Factor XIIIa
Author(s) -
Böhm Miriam,
Kühl Toni,
Hardes Kornelia,
Coch Richard,
Arkona Christoph,
Schlott Bernhard,
Steinmetzer Torsten,
Imhof Diana
Publication year - 2012
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.201100405
Subject(s) - factor xiiia , peptide , chemistry , glutamine , stereochemistry , solid phase synthesis , biochemistry , amino acid , fibrinogen
Tridegin, a 66‐mer peptide isolated from the leech Haementeria ghilianii , is a potent inhibitor of the coagulation factor XIIIa. This paper describes the chemical synthesis of tridegin by two different strategies—solid‐phase assembly and native chemical ligation—both followed by oxidation in solution phase. Tridegin and truncated analogues were examined for their activity and revealed a particular importance of the C‐terminal region of the parent peptide. Based on these studies a minimal sequence required for factor XIIIa inhibition could be identified. Our data revealed that the glutamine residue at position 52 (Q 52 ) of tridegin most likely binds to the active site of factor XIIIa and was therefore suggested to react with the enzyme. The function of the N‐terminal region is also discussed, as the isolated C‐terminal segment of tridegin lost its inhibitory activity rapidly in the presence of factor XIIIa, whereas this was not the case for the full‐length inhibitor.