Methods are provided for detecting the formation of complexes of molecules, especially proteins, in a sample, such as a cell or tissue lysate. In one aspect, a cleaving probe specific for a first protein in a complex and one or more binding compounds specific for one or more second proteins in a complex are provided. Upon binding, the cleaving probe is induced to generate an active species, such as singlet oxygen, that cleaves molecular tags attached to the binding compounds only in the local region of the cleaving probe. The released molecular tags are separated from the assay mixture and from one another to provide a readout that is related to the number and types of proteins present in the complex.
Single Cell Analysis of Membrane Molecules
申请人:Boone Travis
公开号:US20090173631A1
公开(公告)日:2009-07-09
Interrogation of surface receptors of individual cells within a population of cell types in a single mixture is described. Each cell comprises, bound to target surface receptors on the cell, a collection of binding compositions, each comprising a distinct molecular tag. A continuous flow of cell medium containing the cells is pneumatically transported through a channel in a separation device, toward a cleavage/release zone, where specific tags correlating to each binding composition, and thus to each corresponding cell surface receptor, are released from the binding compositions on the cell surface. The method is effective to produce a separately detectable collection of tag signals for each cell.