NDLI: Antibody-probed conformational transitions in the protease domain of human factor IX upon calcium binding and zymogen activation: putative high-affinity Ca(2+)-binding site in the protease domain.

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Antibody-probed conformational transitions in the protease domain of human factor IX upon calcium binding and zymogen activation: putative high-affinity Ca(2+)-binding site in the protease domain.

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Antibody-probed conformational transitions in the protease domain of human factor IX upon calcium binding and zymogen activation: putative high-affinity Ca(2+)-binding site in the protease domain.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sabharwal, A. K. Gorka, J. Birktoft, J. J. Bajaj, S. P.
Description	Author Affiliation: Bajaj SP ( Department of Medicine, St. Louis University School of Medicine, MO 63104.);
Abstract	The Fab fragment of a monoclonal antibody (mAb) reactive to the N-terminal half (residues 180-310) of the protease domain of human factor IX has been previously shown to inhibit the binding of factor IXa to its cofactor, factor VIIIa. These data suggested that this segment of factor IXa may participate in binding to factor VIIIa. We now report that the binding rate (kon) of the mAb is 3-fold higher in the presence of Ca2+ than in its absence for both factors IX and IXa; the half-maximal effect was observed at approximately 300 microM Ca2+. Furthermore, the off rate (koff) of the mAb is 10-fold higher for factor IXa than for factor IX with or without Ca2+. Moreover, like the kon for mAb binding, the incorporation of dansyl-Glu-Gly-Arg chloromethyl ketone (dEGR-CK) into factor IXa was approximately 3 times faster in the presence of Ca2+ than in its absence. Since steric factors govern the kon and the strength of noncovalent interactions governs the koff, the data indicate that the region of factor IX at residues 180-310 undergoes two separate conformational changes before expression of its biologic activity: one upon Ca2+ binding and the other upon zymogen activation. Furthermore, the dEGF-CK incorporation data suggest that both conformational changes also affect the active site residues. Analyses of the known three-dimensional structures of serine proteases indicate that in human factor IX a high-affinity Ca(2+)-binding site may be formed by the carboxyl groups of glutamates 235 and 245 and by the main chain carbonyl oxygens of residues 237 and 240. In support of this conclusion, a synthetic peptide including residues 231-265 was shown to bind Ca2+ with a Kd of approximately 500 microM. This peptide also bound to the mAb, although with approximately 500-fold reduced affinity. Moreover, like factor IX, the peptide bound to the mAb more strongly (approximately 3-fold) in the presence of Ca2+ than in its absence. Thus, it appears that a part of the epitope for the mAb described above is contained in the proposed Ca(2+)-binding site in the protease domain of human factor IX. This proposed site is analogous to the Ca(2+)-binding site in trypsin and elastase, and it may be involved in binding factor IXa to factor VIIIa.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	89
Language	English
Publisher	National Academy of Sciences
Publisher Date	1992-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Factor IX Physiology Amino Acid Sequence Antibodies, Monoclonal Immunology Antibody Affinity Binding Sites Calcium Metabolism Enzyme Activation Enzyme Precursors Ultrastructure Immunologic Techniques In Vitro Techniques Models, Molecular Molecular Sequence Data Motion Peptides Protein Conformation Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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