Carbohydrate-directed cross-linking reagents
First Claim
1. A conjugate molecule having a glycoprotein covalently attached to a thiol-containing compound via a compound of formula I ##STR3## wherein the conjugate has a hydrazide moiety and a maleimide moiety, wherein the hydrazide and the maleimide moieties are separated by a spacer X,wherein X is an aliphatic hydrocarbon spacer of 6 to about 25 carbon atoms or consists of an aliphatic hydrocarbon chain and an alicyclic or aromatic moiety having a total number of 6 to about 25 carbon atoms,wherein X is covalently attached to the hydrazide moiety and X is covalently attached to the heteronitrogen of the maleimide moiety,wherein the glycoprotein is covalently attached to the hydrazide via a hydrazone linkage;
- andwherein the thiol-containing compound is covalently attached to a heterocyclic carbon atom of the maleimide via a thioether linkage.
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Abstract
The invention provides heterobifunctional cross-linking reagents and methods of using the cross-linking reagents. The cross-linking reagents of the invention combine a nucleophilic hydrazide residue with an electrophilic maleimide residue, allowing coupling of aldehydes to free thiols. In the methods of the invention, human immunodeficiency virus (HIV) infected cells can be detected using conjugates that include CD4 molecules conjugated to detectable markers via the disclosed cross-linking reagents.
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Citations
17 Claims
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1. A conjugate molecule having a glycoprotein covalently attached to a thiol-containing compound via a compound of formula I ##STR3## wherein the conjugate has a hydrazide moiety and a maleimide moiety, wherein the hydrazide and the maleimide moieties are separated by a spacer X,
wherein X is an aliphatic hydrocarbon spacer of 6 to about 25 carbon atoms or consists of an aliphatic hydrocarbon chain and an alicyclic or aromatic moiety having a total number of 6 to about 25 carbon atoms, wherein X is covalently attached to the hydrazide moiety and X is covalently attached to the heteronitrogen of the maleimide moiety, wherein the glycoprotein is covalently attached to the hydrazide via a hydrazone linkage; - and
wherein the thiol-containing compound is covalently attached to a heterocyclic carbon atom of the maleimide via a thioether linkage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification