Oriented Immobilization of Farnesylated Proteins by the Thiol-Ene Reaction

Anchoring the protein: Proteins were immobilized rapidly under mild conditions by thiol-ene photocoupling between S-farnesyl groups attached to a genetically encodable “CAAX-box” tetrapeptide sequence (A is aliphatic) at the C terminus of the protein and surface-exposed thiols (see scheme). This method enables the oriented covalent immobilization of proteins directly from expression lysates without additional purification or derivatization steps.