Hybrid and single chain meganucleases and use thereof
This patent application relates to hybrid and/or single-chain rare-cutting endonucleases, called meganucleases, which recognize and cleave a specific nucleotide sequence, to polynucleotide sequences encoding for said rare-cutting endonucleases, to a vector comprising one of said polynucleotide sequences, to a cell or animal comprising one of said polynucleotide sequences or said rare-cutting endonucleases, to a process for producing one of said rare-cutting endonucleases and any use of the disclosed products and methods. More particularly, this invention contemplates any use of such rare-cutting endonuclease for genetic engineering and gene therapy.
1. An isolated hybrid meganuclease comprising two domains,
wherein the N-terminal domain is derived from the first domain of the I-DmoI LAGLIDADG endonuclease and the C-terminal domain is derived from the I-Cre I LAGLIDADG endonuclease,
wherein each of said N-terminal and C-terminal domain comprises a αββαββα fold, wherein the two ββ hairpins connected by an α helix (second helix) that are folded in a four-stranded antiparallel beta-sheet and the downstream α helix (third helix) form the DNA binding moiety of said domain, and wherein the first α helix comprises a dodecapeptide motif,
wherein the αββαββα fold of the N-terminal domain corresponds to the amino acid sequence from positions 8 to 92 of the I-DmoI sequence SEQ ID NO: 18 and comprises the dodecapeptide motif SEQ ID NO: 20 (LLGLIIGDG),
wherein the αββαββα fold of the C-terminal domain corresponds to the amino acid sequence from anyone of position 8 to 13 to position 94 of the I-CreI sequence SEQ ID NO: 19 and comprises the dodecapeptide motif SEQ ID NO: 21 (LAGFVDGDG),
wherein said N-terminal and C-terminal domains are joined by a polypeptide linker, and
wherein said hybrid meganuclease comprises an amino acid sequence which is at least 80% identical to SEQ ID NO: 2, and has endonuclease activity.
2. The hybrid meganuclease according to claim 1 , wherein the αββαββα fold of the C-terminal domain corresponds to the amino acid sequence from positions 105 to 109 of the I-DmoI sequence SEQ ID NO: 18 fused at its C-terminal residue directly to the N-terminal residue of the sequence from positions 13 to 94 of the I-CreI sequence SEQ ID NO: 19.
3. The hybrid meganuclease according to claim 1 , which comprises a N-terminal domain comprising the sequence from positions 8 to 92 of the I-DmoI sequence SEQ ID NO: 18, joined by a polypeptide linker to a C-terminal domain comprising the sequence from positions 105 to 109 of the I-DmoI sequence SEQ ID NO: 18 fused at its C-terminal residue directly to the N-terminal residue of the sequence from positions 13 to 94 of the I-CreI sequence SEQ ID NO: 19.
4. The hybrid meganuclease according to claim 1 , which comprises a N-terminal domain comprising the sequence from positions 8 to 92 of the I-DmoI sequence SEQ ID NO: 18, joined by a polypeptide linker to a C-terminal domain comprising the sequence from positions 8 to 94 of the I-CreI sequence SEQ ID NO: 19.
5. The hybrid meganuclease according to claim 1 , wherein said polypeptide linker comprises the sequence from positions 96 to 103 of the I-DmoI sequence SEQ ID NO: 18.
6. The hybrid meganuclease according to claim 1 , wherein said polypeptide linker comprises the sequence from positions 93 to 104 of the I-DmoI sequence SEQ ID NO: 18.
7. The hybrid meganuclease according to claim 1 , which comprises the sequence from positions 1 to 109 of the I-DmoI sequence SEQ ID NO: 18 fused at its C-terminal residue directly to the N-terminal residue of the sequence from positions 13 to 163 of the I-CreI sequence SEQ ID NO: 19.
8. The hybrid meganuclease according to claim 1 , which comprises an amino acid sequence that is at least 90% identical to SEQ ID NO: 2.
9. The hybrid meganuclease according to claim 1 , which comprises an amino acid sequence that is at least 95% identical to SEQ ID NO: 2.
10. The hybrid meganuclease according to claim 1 , which comprises an amino acid sequence that is at least 99% identical to SEQ ID NO: 2.
11. The hybrid meganuclease according to claim 1 , which comprises at least one mutation in SEQ ID NO: 2 that avoids the steric hindrance between amino acid side chains and/or increases the stability of the hybrid meganuclease.
12. The hybrid meganuclease of claim 1 , which comprises the substitution of at least one amino acid residue in the sequence SEQ ID NO: 2 that is selected from the group consisting of: L48, H52, L56 and 1108.
13. The hybrid meganuclease of claim 1 , which comprises at least one amino acid substitution in the sequence SEQ ID NO: 2 that is selected from the group consisting of: L48A, H52A, L56D and 1108L.
14. The hybrid meganuclease of claim 1 , which comprises the amino acid sequence of SEQ ID NO: 4.
15. The hybrid meganuclease of claim 1 , which comprises the amino acid sequence of SEQ ID NO: 2.