Modulation of procarboxypeptidase R (ProCPR) activation by complementary peptides to thrombomodulin.
We designed complementary peptides (C-peptides) using a novel computer program (MIMETIC), which generates a series of peptides designed to interact with a target peptide sequence. Carboxypeptidase R (CPR) is an unstable basic carboxypeptidase found in fresh serum in addition to carboxypeptidase N (CPN) which is stable. CPR is generated from its precursor form (proCPR) by trypsin-like enzymes, and its activation is mediated by thrombin generated in the coagulation cascade. The efficiency of activation is enhanced approximately 1,200-fold when thrombin (T) is bound to thrombomodulin (TM). We attempted to generate C-peptides which recognize the T-binding site within TM assuming that some of these might interfere with the generation of T and TM complexes (T-TM). Among three peptides designed, two inhibited the enhancement in activation of proCPR by T in the presence of TM. One of the peptides at 16 microM reduced the activation of proCPR to the level obtained by T alone.
Shimomura
Yasuyo
Y
Department of Biodefense, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan.
Kawamura
Takeshi
T
Komura
Hidefumi
H
Campbell
William
W
Okada
Noriko
N
Okada
Hidechika
H
D025901:Carboxypeptidase B2 / Q000235:genetics / Q000378:metabolism*; D004789:Enzyme Activation; D004792:Enzyme Precursors / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D010455:Peptides / Q000494:pharmacology; D013917:Thrombin / Q000378:metabolism*; D018180:Thrombomodulin / Q000097:blood / Q000737:chemistry / Q000378:metabolism*
D004792:Enzyme Precursors; D010455:Peptides; D018180:Thrombomodulin; D025901:Carboxypeptidase B2; D013917:Thrombin