Multiplexed measurement of membrane protein populations
First Claim
1. A method for determining populations of each of a plurality of surface membrane proteins in a cellular sample, the method comprising the steps of:
- providing a binding compound for each of the plurality of surface membrane proteins, each binding compound having one or more eTag reporters attached thereto by a cleavable linkage, the one or more eTag reporters of each different binding compound having a different electrophoretic mobility so that eTag reporters of each different binding compound form distinct peaks upon electrophoretic separation;
combining with the cellular sample a binding compound for each of the plurality of surface membrane proteins such that in the presence of a surface membrane protein a complex is formed between each surface membrane protein and the binding compound specific therefor;
cleaving the cleavable linkage of each binding compound forming such complex so that eTag reporters are released; and
electrophoretically separating and identifying the released eTag reporters to determine the populations of the plurality of surface membrane proteins.
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Accused Products
Abstract
Families of compositions are provided as labels, referred to as eTag reporters for attaching to polymeric compounds and assaying based on release of the eTag reporters from the polymeric compound and separation and detection. For oligonucleotides, the eTag reporters are synthesized at the end of the oligonucleotide by using phosphite or phosphate chemistry, whereby mass-modifying regions, charge-modifying regions and detectable regions are added sequentially to produce the eTag labeled reporters. By using small building blocks and varying their combination large numbers of different eTag reporters can be readily produced attached to a binding compound specific for the target compound of interest for identification. Protocols are used that release the eTag reporter when the target compound is present in the sample.
161 Citations
15 Claims
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1. A method for determining populations of each of a plurality of surface membrane proteins in a cellular sample, the method comprising the steps of:
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providing a binding compound for each of the plurality of surface membrane proteins, each binding compound having one or more eTag reporters attached thereto by a cleavable linkage, the one or more eTag reporters of each different binding compound having a different electrophoretic mobility so that eTag reporters of each different binding compound form distinct peaks upon electrophoretic separation;
combining with the cellular sample a binding compound for each of the plurality of surface membrane proteins such that in the presence of a surface membrane protein a complex is formed between each surface membrane protein and the binding compound specific therefor;
cleaving the cleavable linkage of each binding compound forming such complex so that eTag reporters are released; and
electrophoretically separating and identifying the released eTag reporters to determine the populations of the plurality of surface membrane proteins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining populations of each of a plurality of surface membrane proteins in a cellular sample, the method comprising the steps of:
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providing a binding compound for each of a plurality of surface membrane proteins, each binding compound having one or more eTag reporters attached thereto by a cleavable linkage, the one or more eTag reporters of each different binding compound having a different charge/mass ratio so that eTag reporters of each different binding compound form distinct peaks upon electrophoretic separation;
providing a second binding compound for each of the plurality of surface membrane proteins, each second binding compound being conjugated with an active species producing moiety;
combining with the cellular sample a binding compound and a second binding compound for each of the plurality of surface membrane proteins such that in the presence of a surface membrane protein a complex is formed between the surface membrane protein and the binding compound and the second binding compound specific therefor, and such that the active species producing moiety of the second binding compound causes the generation of an active species and the cleavage of one or more cleavable linkages to release one or more eTag reporters; and
electrophoretically separating and identifying the released eTag reporters to determine the populations of surface membrane proteins in the cellular sample. - View Dependent Claims (13, 14, 15)
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Specification