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- W89307538 abstract "We have previously demonstrated that a monoclonal antibody (5F7) directed against the heavy chain region of factor XI inhibits the binding of factor XI to high molecular weight kininogen (high Mr kininogen) and the surface-mediated proteolytic activation of factor XI by factor XIIa in the presence of high Mr kininogen. In order to identify the structural domain of factor XI that binds high Mr kininogen, CNBr-digested factor XI was passed over a 5F7 antibody affinity column. One of two CNBr peptides that bound to this 5F7 affinity column inhibited binding of 125I-factor XI to high Mr kininogen, as did intact factor XI. Polyacrylamide gel electrophoresis in sodium dodecyl sulfate of an inhibitory peptide purified by high performance liquid chromatography revealed an Mr of 10,000-15,000. Gas-phase sequencing of this peptide revealed the following amino-terminal sequence: X-X-Val-Thr-Gln-Leu-Leu-Lys-Asp-Thr. These data together with the amino acid composition of the isolated peptide indicate that both the epitope recognized by antibody 5F7 and at least a portion of the high Mr kininogen binding site are contained within the amino-terminal portion of factor XI comprising residues Glu-1 through Met-102. Further cleavage of this peptide with o-iodosobenzoic acid at a tryptophanyl peptide bond revealed that an Mr 5,000 peptide (with the amino-terminal sequence Trp-Phe-Thr-Cys-Val-Leu) bound to a high Mr kininogen affinity column and inhibited binding of 125I-factor XI to high Mr kininogen. Finally, a synthetic peptide comprising residues Phe-56 through Ser-86 inhibited 125I-factor XI binding to high Mr kininogen. These experiments strongly suggest that the high Mr kininogen binding site is contained within the domain in the heavy chain region of factor XI comprising residues Phe-56 through Ser-86." @default.
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- W89307538 date "1990-03-01" @default.
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- W89307538 title "Localization of the high molecular weight kininogen binding site in the heavy chain of human factor XI to amino acids phenylalanine 56 through serine 86." @default.
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- W89307538 doi "https://doi.org/10.1016/s0021-9258(19)39715-7" @default.
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