Protein coupling to lipid vesicles
First Claim
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1. A method of coupling targeting molecules to nonphospholipid lipid vesicles while retaining the targeting specificity of said targeting molecules comprising the steps of:
- selecting a targeting molecule having a free NH2 group thereon,reacting said targeting molecule with a bifunctional agent comprising N-hydroxysuccinimidyl 3-(2-pyridyldithio)propionate, in a manner such that said bifunctional agent reacts with said NH2 group on said targeting molecule to incorporate a free SH group onto said targeting molecule,forming a nonphospholipid lipid vesicle having a steroid with a free SH group as one of its structural components, andreacting said lipid vesicle having a free SH group thereon and said targeting molecule with said free SH group,thereby coupling said targeting molecule to said lipid vesicle.
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Abstract
A new method of coupling proteins and other targeting molecules to lipid vesicles has been developed. A bifunctional agent forms a covalent bond without damaging the lipid structure and permits retention of protein activity.
143 Citations
23 Claims
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1. A method of coupling targeting molecules to nonphospholipid lipid vesicles while retaining the targeting specificity of said targeting molecules comprising the steps of:
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selecting a targeting molecule having a free NH2 group thereon, reacting said targeting molecule with a bifunctional agent comprising N-hydroxysuccinimidyl 3-(2-pyridyldithio)propionate, in a manner such that said bifunctional agent reacts with said NH2 group on said targeting molecule to incorporate a free SH group onto said targeting molecule, forming a nonphospholipid lipid vesicle having a steroid with a free SH group as one of its structural components, and reacting said lipid vesicle having a free SH group thereon and said targeting molecule with said free SH group, thereby coupling said targeting molecule to said lipid vesicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of delivering a specified material to a particular location or tissue in a human or animal body comprising the steps of:
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encapsulating said specified material in a nonphospholipid lipid vesicle, said lipid vesicle containing a steroid having a free SH group as one of its structural components, selecting a proteinaceous targeting molecule which reacts with said particular location or tissue, reacting said proteinaceous targeting molecule with a bifunctional agent comprising N-hydroxysuccinimidyl 3-(2-pyridyldithio)propionate, in a manner such that said bifunctional agent reacts with free NH2 groups on said targeting molecule and provides a free SH group, thereby forming a modified targeting molecule, reacting a plurality of said modified targeting molecules with said lipid vesicle so that at least one of said modified targeting molecules is bound to the surface of said lipid vesicle by an S--S bond, introducing said lipid vesicle having said modified targeting molecule bound thereto into said human or animal body, and allowing said targeting molecule to react with its target, thereby bringing said encapsulated material to said specified location or tissue. - View Dependent Claims (12, 13, 14)
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- 15. A nonphospholipid lipid vesicle having a targeting molecule attached thereto comprising a nonphospholipid lipid vesicle containing a steroid having free SH groups as one of its structural components, said targeting molecule being attached to said lipid vesicle by an S--S bond between a free SH group on said targeting molecule and a free SH group on said lipid vesicle.
Specification