Global Proteomic screening of random bead arrays using mass spectrometry imaging
First Claim
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1. A label-free method of detecting the interaction of prey molecules with bait molecules on an array of beads, comprising:
- a) providing a mixture comprising first and second beads, said first beads comprising first bait molecules and said first beads having a first mass tag attached, said second beads comprising second bait molecules and said second beads having a second mass tag attached, wherein said first and second bait molecules and said first and second mass tags are different;
b) contacting said first and second beads with a solution comprising a population of prey molecules;
c) making an array with said beads, imaging said beads in said array; and
d) subjecting said array to mass spectrometry analysis under conditions wherein at least one of said first and second beads is identified by detection of its corresponding mass tag, and wherein the at least one of said first or second identified beads had bound to said prey molecules, wherein said mass spectrometry analysis comprises imaging of individual beads in said array.
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Abstract
Methods for proteomic screening on random protein-bead arrays by mass spec is described. Photocleavable mass tags are utilized to code a protein library (bait molecules) displayed on beads randomly arrayed in an array substrate. A library of probes (prey) can be mixed with the protein-bead array to query the array. Because mass spec can detect multiple mass tags, it is possible to rapidly identify all of the interactions resulting from this mixing.
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Citations
28 Claims
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1. A label-free method of detecting the interaction of prey molecules with bait molecules on an array of beads, comprising:
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a) providing a mixture comprising first and second beads, said first beads comprising first bait molecules and said first beads having a first mass tag attached, said second beads comprising second bait molecules and said second beads having a second mass tag attached, wherein said first and second bait molecules and said first and second mass tags are different; b) contacting said first and second beads with a solution comprising a population of prey molecules; c) making an array with said beads, imaging said beads in said array; and d) subjecting said array to mass spectrometry analysis under conditions wherein at least one of said first and second beads is identified by detection of its corresponding mass tag, and wherein the at least one of said first or second identified beads had bound to said prey molecules, wherein said mass spectrometry analysis comprises imaging of individual beads in said array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A label-free method of detecting the interaction of prey molecules with bait molecules, comprising:
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a) providing a mixture comprising first and second beads, said first beads comprising first bait molecules and said first beads having a first mass tag attached, said second beads comprising second bait molecules and said second beads having a second mass tag attached, wherein said first and second bait molecules and said first and second mass tags are different; b) making an array with said beads; c) contacting said beads with a solution comprising a population of prey molecules, imaging said beads in said array; and d) subjecting said array to mass spectrometry analysis under conditions wherein at least one of said first and second beads is identified by detection of its corresponding mass tag, and wherein the at least one of said first or second identified beads had bound to said prey molecules, wherein said mass spectrometry analysis comprises imaging of individual beads in said array. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification