Fk-506 cytosolic binding protein

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/61 (2006.01) C07K 14/715 (2006.01) C07K 16/40 (2006.01) C12N 9/90 (2006.01) G01N 33/566 (2006.01) G01N 33/94 (2006.01)

Patent

CA 2181803

A new homogeneous cytosolic binding protein (FKBP12.6), having a specific binding activity of about 4.8 mg FK-506 per mg protein and a molecular weight of about 10-12 kilodaltons, reversibly binds the immunosuppressant FK-506, but not cyclosporine A (CSA). The protein is unstable to heating at 56 °C for 30 minutes losing its FK-506 binding affinity. The FKBP12.6 protein is isolated from the cytosol of mammalian tissues, preferably bovine or human brain tissue, and can be used in diagnostic and purification procedures involving FK-506-type macrolide immunosuppressants. The FKBP12.6 protein also has peptidyl-proline isomerase enzymatic activity, catalyzing the cis-trans isomerization of proline-containing peptide bonds. In addition, FKBP12,6 binds to and inhibits the phosphatase calcineurin in the presence of FK-506.

Nouvelle protéine de liaison cytosolique (FKBP12,6), présentant une activité spécifique de liaison d'environ 4,8 mg de FK-506 par mg de protéine, et un poids moléculaire d'environ 10-12 kilodaltons, qui se fixe réversiblement à l'immunosuppresseur FK- 506, mais pas à la cyclosporine A (CSA). Ladite protéine devient instable et perd ses affinités de liaison pour le FK- 506 quand on la chauffe à 56~ pendant 30 minutes. La protéine FKBP12,6, qu'on isole à partir du cytosol de tissus de mammifères (tissus de cerveaux humains ou bovins de préférence), peut servir à des fins de diagnostique ou de purification utilisant des macrolides immunosuppresseurs du genre FK- 506. La protéine FKBP12,6 présente en outre une activité d'enzyme isomérase peptidyle-proline lui permettant de catalyser l'isomérisation cis-trans des liaisons peptidiques contenant des prolines. De plus, la protéine FKBP12,6 se fixe à la FK- 506 et inhibe la phosphatase calcineurine en sa présence.

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