DP04 POLYMERASE VARIANTS WITH IMPROVED ACCURACY
Recombinant DPO4-type DNA polymerase variants with amino acid substitutions that confer modified properties upon the polymerase for improved single molecule sequencing applications are provided. Such properties may include enhanced binding and accurate incorporation of bulky nucleotide analog substrates into daughter strands and the like. Also provided are compositions comprising such DPO4 variants and nucleotide analogs, as well as nucleic acids which encode the polymerases with the aforementioned phenotypes.
1 . An isolated recombinant DNA polymerase, which recombinant DNA polymerase comprises an amino acid sequence that is at least 85% identical to amino acids 1-340 of SEQ ID NO:1, which recombinant polymerase comprises a mutation at amino acid position 78, wherein the mutation at amino acid position 78 is K78D and at least one mutation at an amino acid position selected from the group consisting of 31, 36, 62, 63, 79, 243, 252, 253, 254, 331, 332, 334, and 338, wherein identification of positions is relative to wildtype DPO4 polymerase (SEQ ID NO:1), and which recombinant DNA polymerase exhibits polymerase activity.
2 . The polymerase of claim 1 , wherein the polymerase comprises an amino acid sequence that is at least 88% identical to amino acids 1-340 of SEQ ID NO:1.
3 . The polymerase of claim 1 , wherein the mutation at amino acid position 31 is C31S.
4 . The polymerase of claim 1 , wherein the mutation at amino acid position 36 is R36K.
5 . The polymerase of claim 1 , wherein the mutation at amino acid position 62 is V62K.
6 . The polymerase of claim 1 , wherein the mutation at amino acid position 63 is E63R.
7 . The polymerase of claim 1 , wherein the mutation at amino acid position 79 is selected from the group consisting of E79L, E79D, and E791.
8 . The polymerase of claim 1 , wherein the mutation at amino acid position 243 is K243R.
9 . The polymerase of claim 1 , wherein the mutation at amino acid position is 252 is selected from the group consisting of K252D, K252Q, and K252R.
10 . The polymerase of claim 1 , wherein the mutation at amino acid position 253 is R253Q.
11 . The polymerase of claim 1 , wherein the mutation at amino acid position 254 is N254K or N254D.
12 . The polymerase of claim 1 , wherein the mutation at amino acid position 331 is selected from the group consisting of R331D, R331E, R331N, and R331 L.
13 . The polymerase of claim 1 , wherein the mutation at amino acid position 332 is selected from the group consisting of R332K, R332A, R332Q, and R332S.
14 . The polymerase of claim 1 , wherein the mutation at amino acid position 334 is selected from the group consisting of G334N, G334Q, G334F, and G334A.
15 . The polymerase of claim 1 , wherein the mutation at amino acid position 338 is S338Y or S338F.
16 . The polymerases of claim 1 , further comprising at least one mutation at an amino acid position selected from the group consisting of 42, 56, 76, 82, 83, 86, 152, 153, 155, 156, 184, 187, 188, 189, 190, 248, 289, 290, 291, 292, 293, 294, 295, 296, 297, 299, 300, 301, 317, 321, 324, 325, and 327.
17 . The polymerase of claim 6 , wherein the mutations at amino acid positions 42, 56, 76, 82, 83, 86, 152, 153, 155, 156, 184, 187, 188, 189, 190, 248, 289, 290, 291, 292, 293, 294, 295, 296, 297, 299, 300, 301, 317, 321, 324, 325, and 327 are A42V, K56Y, M76W, Q82W, Q83G, S86E, K152L or K152A, I153T or I153V, A155G, D156R, P184L or P184Q, G187P, N188Y, I189W or 1189F, T190Y, I248T, V289W, T290K, E291S, D292Y, L293W, D294N, I295S, V296Q, S297Y, G299W, R300S, T301W, K317Q, K321Q, E324K, E325K, and E327K.
18 . An isolated recombinant DNA polymerase comprising the amino acid sequence as set forth in any one of SEQ ID NOs: 3-34.
19 . A composition comprising a recombinant DNA polymerase as set forth in claim 1 .
20 . The composition of claim 19 , wherein the composition is present in a DNA sequencing system that comprises at least one non-natural nucleotide analog substrate.
21 . (canceled)