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Studies of the interaction between human protein S and human C4b-binding protein using deletion variants of recombinant human protein S. 1994

G T Chang, and B H Maas, and H K Ploos van Amstel, and P H Reitsma, and R M Bertina, and B N Bouma
Department of Haematology, University Hospital Utrecht, The Netherlands.

Human protein S interacts noncovalently with human C4b-binding protein (C4BP). We have studied this interaction using deletion variants of recombinant human protein S. Two deletion variants were constructed by restriction enzyme digestion and in vitro site-specific mutagenesis of the human protein S cDNA. The variants were stably expressed in C127 cells. Recombinant proteins were purified using Fast Flow Q anion-exchange chromatography. The activated protein C (APC) cofactor activity, C4BP binding properties and reactivity to different monoclonal antibodies against human protein S were examined. The first variant (E variant), which has a deletion of the third epidermal growth factor (EGF)-like domain (deletion of exon VII, corresponding to amino acid residues ASP-160 to Asp-202) expresses normal APC cofactor activity in a plasma system. This activity was inhibited by the addition of purified C4BP. The second variant (L variant), which has a deletion of the C-terminal loop of the sex hormone binding globulin (SHBG)-like domain (deletion of exon XV, corresponding to amino acid residues Asp-583 to Ser-635) also expresses normal APC cofactor activity in plasma. This activity could only be partially inhibited by the addition of purified C4BP. Binding of the recombinant proteins to C4BP was studied in a system using purified proteins. The E variant binds to C4BP with the same affinity similar as recombinant wild type protein S (apparent Kd approximately 10(-10) M). The L variant, however, shows a markedly reduced affinity for binding to C4BP (apparent Kd approximately 10(-7) M).(ABSTRACT TRUNCATED AT 250 WORDS)

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011486 Protein C A vitamin-K dependent zymogen present in the blood, which, upon activation by thrombin and thrombomodulin exerts anticoagulant properties by inactivating factors Va and VIIIa at the rate-limiting steps of thrombin formation.
D011993 Recombinant Fusion Proteins Recombinant proteins produced by the GENETIC TRANSLATION of fused genes formed by the combination of NUCLEIC ACID REGULATORY SEQUENCES of one or more genes with the protein coding sequences of one or more genes. Fusion Proteins, Recombinant,Recombinant Chimeric Protein,Recombinant Fusion Protein,Recombinant Hybrid Protein,Chimeric Proteins, Recombinant,Hybrid Proteins, Recombinant,Recombinant Chimeric Proteins,Recombinant Hybrid Proteins,Chimeric Protein, Recombinant,Fusion Protein, Recombinant,Hybrid Protein, Recombinant,Protein, Recombinant Chimeric,Protein, Recombinant Fusion,Protein, Recombinant Hybrid,Proteins, Recombinant Chimeric,Proteins, Recombinant Fusion,Proteins, Recombinant Hybrid
D002352 Carrier Proteins Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes. Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D003169 Complement Inactivator Proteins Serum proteins that negatively regulate the cascade process of COMPLEMENT ACTIVATION. Uncontrolled complement activation and resulting cell lysis is potentially dangerous for the host. The complement system is tightly regulated by inactivators that accelerate the decay of intermediates and certain cell surface receptors. Complement Cytolysis Inhibiting Proteins,Complement Cytolysis Inhibitor Proteins,Complement Inactivating Proteins,Serum Complement Inactivators,Complement Inactivators, Serum,Inactivating Proteins, Complement,Inactivator Proteins, Complement,Inactivators, Serum Complement,Proteins, Complement Inactivating,Proteins, Complement Inactivator
D006023 Glycoproteins Conjugated protein-carbohydrate compounds including MUCINS; mucoid, and AMYLOID glycoproteins. C-Glycosylated Proteins,Glycosylated Protein,Glycosylated Proteins,N-Glycosylated Proteins,O-Glycosylated Proteins,Glycoprotein,Neoglycoproteins,Protein, Glycosylated,Proteins, C-Glycosylated,Proteins, Glycosylated,Proteins, N-Glycosylated,Proteins, O-Glycosylated
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000911 Antibodies, Monoclonal Antibodies produced by a single clone of cells. Monoclonal Antibodies,Monoclonal Antibody,Antibody, Monoclonal

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