Methods and reagents for determining protein s

G - Physics – 01 – N

Patent

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Details

G01N 33/68 (2006.01) C07K 14/745 (2006.01) C07K 16/36 (2006.01) G01N 33/86 (2006.01)

Patent

CA 2269966

The present invention is concerned with an assay for free protein S comprising addition of a ligand specific for free protein S to a biological fluid sample to form a protein S/ligand complex, and subsequent determination of the amount of said complex formed in the sample. The ligand specific for free protein S is comprised of the C4b binding protein (C4BP) or part thereof or a compound comprising an amino acid residue sequence that binds specifically to the binding site for C4BP in protein S. The present invention is also concerned with antibodies specific for free protein S, which can be used as ligands in the assay of the invention, and with protein S related polypeptides, which can be used to produce such antibodies. In addition, the present invention is related to diagnostic test systems, suitable in kit form, comprising the present ligand and at least one further reagent required in the assay for free protein S.

La présente invention concerne une méthode de titrage de la protéine S libre consistant en l'addition d'un ligand spécifique à la protéine S libre à un échantillon de liquide biologique pour former un complexe protéine S/ligand, puis en la détermination de la quantité dudit complexe formé dans l'échantillon. Le ligand spécifique à la protéine S libre comprend la protéine de liaison C4b (C4BP) ou bien une partie de celle-ci ou bien un composé comprenant une séquence de restes d'acides aminés se liant spécifiquement au site de liaison de C4BP dans la protéine S. La présente invention concerne également des anticorps spécifiques à la protéine S libre, pouvant être utilisés comme ligands dans la méthode de titrage de l'invention, et des polypeptides relatifs à la protéine S pouvant être utilisés pour produire ces anticorps. De plus, l'invention concerne des systèmes de tests de diagnostic adaptés sous forme de kits, comprenant le présent ligand ainsi qu'au moins un autre réactif nécessaire au titrage de la protéine S libre.

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