Enzyme-pore constructs
First Claim
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1. A method of sequencing a target nucleic acid sequence, comprising:
- (a) contacting the nucleic acid strand with (i) a polymerase and (ii) labelled nucleotides in the presence of a pore such that phosphate labelled species are sequentially released when nucleotides are added to the nucleic acid strand, wherein the phosphate species contain a label specific for each nucleotide, and wherein the phosphate labelled species interacts with the barrel or channel of the pore;
(b) detecting the phosphate labeled species using the pore and thereby detecting the addition of the nucleotide to the nucleic acid strand, wherein the detecting comprises measuring the current passing through the pore during each interaction; and
(c) using the order of the phosphate labeled species to determine the sequence of the nucleic acid strand.
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Abstract
The invention relates to constructs comprising a transmembrane protein pore subunit and a nucleic acid handling enzyme. The pore subunit is covalently attached to the enzyme such that both the subunit and enzyme retain their activity. The constructs can be used to generate transmembrane protein pores having a nucleic acid handling enzyme attached thereto. Such pores are particularly useful for sequencing nucleic acids. The enzyme handles the nucleic acid in such a way that the pore can detect its component nucleotides by stochastic sensing.
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11 Claims
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1. A method of sequencing a target nucleic acid sequence, comprising:
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(a) contacting the nucleic acid strand with (i) a polymerase and (ii) labelled nucleotides in the presence of a pore such that phosphate labelled species are sequentially released when nucleotides are added to the nucleic acid strand, wherein the phosphate species contain a label specific for each nucleotide, and wherein the phosphate labelled species interacts with the barrel or channel of the pore; (b) detecting the phosphate labeled species using the pore and thereby detecting the addition of the nucleotide to the nucleic acid strand, wherein the detecting comprises measuring the current passing through the pore during each interaction; and (c) using the order of the phosphate labeled species to determine the sequence of the nucleic acid strand. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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