Patent ID: 9617591
Date: 2017-04-11
CPC Classifications: C12Q

Claim:
1. A method of characterising a target polynucleotide, comprising: (a) providing a transmembrane nanopore and a membrane in an aqueous solution, wherein the transmembrane nanopore is present in the membrane, and wherein the aqueous solution comprises a salt at a concentration in a range of 0.3 M to 1 M; (b) combining in the aqueous solution of step (a) a target polynucleotide and a XPD helicase under conditions in which the helicase binds to the target polynucleotide and controls the movement of the target polynucleotide through the nanopore; and (c) measuring, during application of a potential across the nanopore, ion flow through the transmembrane nanopore as the polynucleotide moves through the nanopore wherein the ion flow measurements are indicative of one or more characteristics of the target polynucleotide, wherein the one or more characteristics are selected from (i) the length of the target polynucleotide, (ii) the identity of the target polynucleotide, (iii) the sequence of the target polynucleotide, (iv) the secondary structure of the target polynucleotide and (v) whether or not the target polynucleotide is modified, and thereby characterising the target polynucleotide.