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- W2074977072 abstract "Platelet receptor recognition domains are located on the gamma and alpha chains of human fibrinogen. The former encompasses residues 400-411 [Kloczewiak, M., Timmons, S., Lukas, T. J., & Hawiger, J. (1984) Biochemistry 23, 1767], and the latter is present in two loci on the alpha chain (alpha 95-97 and alpha 572-574) [Hawiger, J., Kloczewiak, M., Bednarek, M. A., & Timmons, S. (1989) Biochemistry (first of three papers in this issue)]. Peptide gamma 400-411 (HHLGGAKQAGDV) inhibited aggregation of ADP-treated platelets mediated not only by gamma-chain but also by alpha-chain multimers. Peptide alpha 572-575 (RGDS) inhibited aggregation of platelets mediated by alpha-chain as well as gamma-chain multimers. These results indicate that the platelet receptor for fibrinogen is isospecific with regard to the domain present on alpha and gamma chains. Subsequent checkerboard analysis of combinations of gamma 400-411 and alpha 572-575 showed that the inhibitory effect toward binding of 125I-fibrinogen was additive rather than synergistic. Next, a series of hybrid peptides was constructed in which the alpha-chain sequence RGDF (alpha 95-98) replaced the carboxy-terminal segment of gamma 408-411. The dodecapeptide HHLGGAKQRGDF was inhibitory with concentration, causing 50% inhibition of binding (IC50) at 6 microM, 5 times more potent than gamma 400-411. The shorter peptides AKQRGDF and KQRGDF were also more inhibitory than gamma 400-411. The second series of hybrid peptides was constructed with the alpha-chain sequence RGDS preceding the sequence of gamma 400-411 or sequence RGDV following it.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2074977072 date "1989-04-04" @default.
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- W2074977072 title "Antiplatelet hybrid peptides analogous to receptor recognition domains on .gamma. and .alpha. chains of human fibrinogen" @default.
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- W2074977072 doi "https://doi.org/10.1021/bi00433a026" @default.
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