Modified Proteins and Methods of Making and Using Same
First Claim
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1. A method of detecting a nucleotide incorporation, comprising:
- (a) performing a nucleotide incorporation using a modified polymerase and generating one or more hydrogen ions as a by-product of the nucleotide incorporation, where the modified polymerase includes one or more amino acid substitutions that reduce the buffering capacity of the modified polymerase relative to an unmodified polymerase; and
(b) detecting the presence of the one or more hydrogen ions generated as a by-product of the nucleotide incorporation, thereby detecting the nucleotide incorporation.
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Abstract
Methods, compositions, systems, apparatuses and kits comprising modified proteins, particularly modified nucleic acid-binding proteins with altered buffering properties are provided. For example, in some embodiments, methods of forming modified proteins including one or more amino acid modifications to achieve desired pKa values are described. Furthermore, the invention provides methods for using such modified proteins in ion-producing reactions, such as ion-based nucleic acid sequencing reactions.
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Citations
15 Claims
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1. A method of detecting a nucleotide incorporation, comprising:
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(a) performing a nucleotide incorporation using a modified polymerase and generating one or more hydrogen ions as a by-product of the nucleotide incorporation, where the modified polymerase includes one or more amino acid substitutions that reduce the buffering capacity of the modified polymerase relative to an unmodified polymerase; and (b) detecting the presence of the one or more hydrogen ions generated as a by-product of the nucleotide incorporation, thereby detecting the nucleotide incorporation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for sequencing a nucleic acid, comprising:
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providing template nucleic acid hybridized to a sequencing primer and bound to a bufferless polymerase; synthesizing a new nucleic acid strand by incorporating one or more known nucleoside triphosphates sequentially at the 3′
end of the sequencing primer; anddetecting such incorporation at the 3′
end of the primer by measuring a concentration of a hydrogen ion byproduct generated if the known nucleoside triphosphate is complementary to corresponding nucleotides in the template nucleic acid. - View Dependent Claims (15)
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Specification