Tandem analyses of noncovalently driven effectors for modulatory mapping of activities of protein sites
First Claim
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1. A method for modification of a target group in or near a secondary ligand binding site of a protein comprising:
- contacting the protein with at least one site-specific activated polymer complex comprising;
a functional group reactive with the target group;
a polymer linked to the functional group; and
a ligand moiety that specifically binds to the secondary ligand binding site, thereby effecting site-specific covalent bonding of the target group on the protein via the functional group,and eliminating the ligand moiety from the protein-polymer conjugate after the specific covalent bonding of the target group on the protein,wherein the functional group is selected from the group consisting of;
a dithioester;
a thioloester;
thionoester;
a selenoester;
a selenoloester;
a selenonooester;
a phosphonoester;
a phosphoric ester;
a phosphinic ester;
a sulfonate ester;
a diazoester;
an acylphosphate;
an o-salicylate;
a p-salicylate;
a m-salicylate;
a disulfide; and
an α
-keto- or β
-keto acid or ester;
wherein the polymer is a polyethylene glycol polymer;
wherein the secondary site-specific ligand moiety is a peptidyl ligand moiety or carbohydrate ligand moiety; and
wherein the secondary ligand binding site is a site differing from a primary binding site; and
wherein the secondary ligand binding site has no effect on the primary function of the protein.
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Abstract
The present invention provides methods of discovering and mapping secondary binding sites on biological molecules (e.g., proteins), the effects, if any, of site occupancy on the primary function of the molecule, and the screening of small molecules against the secondary binding sites. The invention further provides novel complexes for modification of secondary binding sites and the resulting modified biological molecules.
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Citations
13 Claims
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1. A method for modification of a target group in or near a secondary ligand binding site of a protein comprising:
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contacting the protein with at least one site-specific activated polymer complex comprising; a functional group reactive with the target group;
a polymer linked to the functional group; and
a ligand moiety that specifically binds to the secondary ligand binding site, thereby effecting site-specific covalent bonding of the target group on the protein via the functional group,and eliminating the ligand moiety from the protein-polymer conjugate after the specific covalent bonding of the target group on the protein, wherein the functional group is selected from the group consisting of;
a dithioester;
a thioloester;
thionoester;
a selenoester;
a selenoloester;
a selenonooester;
a phosphonoester;
a phosphoric ester;
a phosphinic ester;
a sulfonate ester;
a diazoester;
an acylphosphate;
an o-salicylate;
a p-salicylate;
a m-salicylate;
a disulfide; and
an α
-keto- or β
-keto acid or ester;wherein the polymer is a polyethylene glycol polymer; wherein the secondary site-specific ligand moiety is a peptidyl ligand moiety or carbohydrate ligand moiety; and wherein the secondary ligand binding site is a site differing from a primary binding site; and
wherein the secondary ligand binding site has no effect on the primary function of the protein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification