Engineered polymerases for improved sequencing by binding
Provided herein are engineered DNA polymerases comprising modifications improving accuracy and processivity of the polymerase including modifications in the Motif A region, optionally, along with additional modifications in the palm and/or exonuclease domains of the polymerase. Also provided are nucleic acids encoding the engineered DNA polymerases comprising modifications in motif A of the polymerase, optionally, with additional modifications. Methods, vectors, kits, and compositions comprising the nucleic acids and compositions, methods and kits comprising the engineered polymerases are also provided.
1. An engineered DNA polymerase, wherein the DNA polymerase comprises an amino acid sequence that has at least 98% amino acid sequence identity to the amino acid sequence of SEQ ID NO:1 and comprises amino acid substitutions L408F, Y409F, P410T, M523T, V524T, L544F, and H545F, wherein amino acid numbering is relative to the amino acid sequence of SEQ ID NO:1.
2. The engineered DNA polymerase of claim 1 , wherein the polymerase has increased processivity compared to a control polymerase without the amino acid substitutions.
3. The engineered DNA polymerase of claim 2 , wherein the control polymerase comprises the amino acid sequence of SEQ ID NO:4.
4. The engineered DNA polymerase of claim 1 , wherein the polymerase comprises an alanine residue at position 141, an alanine residue at position 143, and a leucine residue at position 485, wherein amino acid numbering is relative to the amino acid sequence of SEQ ID NO:1.
5. A kit comprising the engineered polymerase of claim 1 and instructions for use.