Patent ID: 7754497

Claim:
A method for immobilizing fusion proteins comprising: step 1 of purifying target proteins to be immobilized, which have a first tag portion and a second tag portion by separating and extracting the fusion protein via purification means having the site to which the first tag portion binds; step 2 of activating reactive groups capable of covalently binding to the fusion proteins on a carrier for immobilization, wherein the carrier has the site to which the second tag portion binds; and step 3 of allowing a solution containing the proteins purified in step 1 to react with the carrier after step 2, wherein, in step 3, the fusion proteins are immobilized on the carrier by covalent binding reaction between the reactive groups and the fusion proteins while being concentrated on the carrier by interactions between the second tag portion and the site of the carrier to which the second tag portion binds.