Spatially encoded and mobile arrays of tethered lipids
First Claim
1. An array of separated lipid bilayers, comprising a substrate having a surface defining a plurality of distinct bilayer-compatible surface regions, a plurality of discrete lipid bilayer expanses in associated surface regions, said expanses having inner and outer bilayer surfaces, an aqueous film interposed between each bilayer-compatible surface region and the lower surface of the corresponding lipid bilayer expanse, each of said expanses containing one or more lipids derivatized with an oligonucleotide having a patch-specific oligonucleotide sequence and extending from the outer surface of the associated expanse, a bulk aqueous phase covering the lipid bilayer expanses, and at least one biomolecule anchored to at least one of the lipid bilayer expanses through a complementary oligonucleotide sequence capable of specifically hybridizing with the patch-specific oligonucleotide sequence in that expanse, such that the biomolecule is anchored to that expanse.
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Abstract
Arrays of separated lipid bilayers are disclosed. Also disclosed are methods of using the arrays and methods of forming the arrrays. In addition, the invention provides useful systems and methods for selectively removing, collecting, and reconstitute lipid bilayers from specified regions of a surface. A stream of detergent solution is directed over a preformed bilayer, resulting in the removal of bilayer material. Diffusion-limited mixing between adjacent flows at low Reynolds number provides confinement of this stripping solution and, consequently, high precision. The freshly exposed surface allows formation of new connected bilayer when exposed to lipid vesicles. In conjunction with surface micropatterning and electrophoretic manipulation, the invention also provides a membrane-based separation/purification strategy.
17 Citations
20 Claims
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1. An array of separated lipid bilayers, comprising
a substrate having a surface defining a plurality of distinct bilayer-compatible surface regions, a plurality of discrete lipid bilayer expanses in associated surface regions, said expanses having inner and outer bilayer surfaces, an aqueous film interposed between each bilayer-compatible surface region and the lower surface of the corresponding lipid bilayer expanse, each of said expanses containing one or more lipids derivatized with an oligonucleotide having a patch-specific oligonucleotide sequence and extending from the outer surface of the associated expanse, a bulk aqueous phase covering the lipid bilayer expanses, and at least one biomolecule anchored to at least one of the lipid bilayer expanses through a complementary oligonucleotide sequence capable of specifically hybridizing with the patch-specific oligonucleotide sequence in that expanse, such that the biomolecule is anchored to that expanse.
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19. A method of manipulating lipid-bilayer regions on a substrate, comprising
applying, to a substrate having formed thereon, a discrete, defined-shaped lipid expanse which is confined to a corresponding defined-shaped region on the substrate and separated by an aqueous film, a controlled laminar-flow stream of an aqueous liquid, under flow conditions effective to remove a portion of the expanse in the path of said stream, wherein remaining portions of said expanse are substantially retained in their original position(s) on said region, adjacent exposed portion(s) of said region.
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20. A system for manipulating lipid-bilayer regions on a substrate, said system comprising
the substrate having formed thereon, a discrete, defined-shaped lipid expanse which is confined to a corresponding defined-shaped region on the substrate and separated by an aqueous film, a flow generating device capable of applying a controlled laminar-flow stream to the substrate, and a composition capable of selectively removing at least a portion of the expanse.
Specification