Protein imaging
First Claim
1. A composition of matter which selectively binds a preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof, the composition comprising:
- a shape-retaining porous gel defining a cavity, the cavity having a binding surface complementary in shape to the molecular surface of the polypeptide chain and having a plurality of positively and negatively charged chemical moieties spatially distributed in a mirror image and charge inverse of a subset of the ionizable groups on the molecular surface of the polypeptide chain, the shape-retaining porous gel having a binding affinity for the polypeptide chain of at least 105 M-1.
3 Assignments
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Accused Products
Abstract
Disclosed are specifically designed binding, "protein imaged" sorbents which reversibly bind with high specificity and affinity a preselected macromolecule, specifically a protein. The sorbents define one or more cavities which have a binding surface complementary in shape to the molecular surface of the macromolecule and a plurality of positively and negatively charged chemical moieties spatially distributed in a mirror image and charge inverse of a subset of the ionizable groups on the molecular surface of the macromolecule. Also disclosed are methods of producing such sorbents, useful over a range of conditions, for both preparative and analytical chromatographic separations or for use in various types of analyses.
67 Citations
26 Claims
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1. A composition of matter which selectively binds a preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof, the composition comprising:
a shape-retaining porous gel defining a cavity, the cavity having a binding surface complementary in shape to the molecular surface of the polypeptide chain and having a plurality of positively and negatively charged chemical moieties spatially distributed in a mirror image and charge inverse of a subset of the ionizable groups on the molecular surface of the polypeptide chain, the shape-retaining porous gel having a binding affinity for the polypeptide chain of at least 105 M-1. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26)
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2. A composition of matter which selectively binds a preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof, the composition comprising:
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a) a rigid particle defining pores; and b) disposed within the pores, a shape-retaining porous gel defining a cavity, the cavity having a binding surface complementary in shape to the molecular surface of the polypeptide chain and having a plurality of positively and negatively charged chemical moieties spatially distributed in a mirror image and charge inverse of a subset of the ionizable groups on the molecular surface of the polypeptide chain, the shape-retaining porous gel having a binding affinity for the polypeptide chain of at least 105 M-1.
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13. A method for producing a shape-retaining porous gel which selectively binds a preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof, the method comprising the steps of:
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a) providing an aqueous solution of a conformationally compliant polymer matrix material at a pH and at a temperature that permits formation of a shape-retaining porous gel, the matrix material having disposed therein positively charged and negatively charged chemical moieties; b) admixing the matrix material with the preselected polypeptide chain to produce a matrix material-polypeptide chain mixture under conditions to produce electrostatic pairing between at least a subset of the chemical moieties in the matrix material and at least a subset of the ionizable groups on the molecular surface of the polypeptide chain; c) inducing the matrix material to form a shape-retaining porous gel; and d) removing the polypeptide chain disposed within the shape-retaining porous gel thereby to produce within the gel an image of the disassociated polypeptide chain, the image having a stereochemical shape complementary to the molecular surface of the disassociated polypeptide chain and having spatially distributed chemical moieties in a mirror image and charge inverse of the subset of the ionizable groups on the molecular surface of the disassociated polypeptide chain. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A shape-retaining porous gel produced by the method of:
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a) providing an aqueous solution of a conformationally compliant polymer matrix material at a pH and at a temperature that permits formation of a shape-retaining porous gel, the matrix material having disposed therein positively charged and negatively charged chemical moieties; b) admixing the matrix material with the preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof under conditions to produce electrostatic pairing between at least a subset of the chemical moieties in the matrix material and at least a subset of the ionizable groups on the molecular surface of the polypeptide chain; c) inducing the matrix material to form a shape-retaining porous gel; and d) removing the polypeptide chain disposed within the shape-retaining porous gel thereby to produce within the gel an image of the disassociated polypeptide chain, the image having a stereochemical shape complementary to the molecular surface of the disassociated polypeptide chain and having spatially distributed chemical moieties in a mirror image and charge inverse of the subset of the ionizable groups on the molecular surface of the disassociated polypeptide chain.
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24. A rigid particle produced by the method of:
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a) providing an aqueous solution of a conformationally compliant polymer matrix material at a pH and at a temperature that permits formation of a shape-retaining porous gel, the matrix material having disposed therein positively charged and negatively charged chemical moieties; b) admixing the matrix material with the preselected polypeptide chain having a plurality of ionizable groups spaced about a molecular surface thereof under conditions to produce electrostatic pairing between at least a subset of the chemical moieties in the matrix material and at least a subset of the ionizable groups on the molecular surface of the polypeptide chain; c) combining the product of step b) with a rigid particle defining a pore under conditions to permit the mixture to enter the pore of the rigid particle; d) inducing the matrix material to form a shape-retaining porous gel within the pore of the rigid particle; and e) removing polypeptide chain disposed within the shape-retaining porous gel thereby to produce within the gel an image of the disassociated polypeptide chain, the image having a stereochemical shape complementary to the molecular surface of the disassociated polypeptide chain and having spatially distributed chemical moieties in a mirror image and charge inverse of the subset of the ionizable groups on the molecular surface of the disassociated polypeptide chain.
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Specification