Gene inactivated mutants with altered protein production
A recombinant filamentous fungal cell (e.g. Aspergillus ) having one or more inactivated chromosomal genes is provided. The chromosomal genes in some embodiments correspond to derA, derB, htmA, mnn9, mnn10, ochA, dpp4, dpp5, pepAa, pepAb, pepAc, pepAd, pepF and combinations thereof. The recombinant fungal cells may include further inactivated chromosomal genes which correspond to pepA, pepB, pepC and pepD. The recombinant filamentous fungal cells may include a heterologous nucleic acid encoding a protein of interest. Also provided are methods of producing a protein of interest in said recombinant filamentous fungal cell.
1. A recombinant filamentous fungal cell comprising one or more inactivated chromosomal gene selected from mnn9 (SEQ ID NO:7), mnn10 (SEQ ID NO:9), ochA (SEQ ID NO:11), dpp4 (SEQ ID NO:13), pepAa (SEQ ID NO:17), pepAb (SEQ ID NO:19), pepAc (SEQ ID NO:31), pepAd (SEQ ID NO:21), pepF (SEQ ID NO:23), or functionally homologous sequences thereto, wherein the functionally homologous sequences have at least 95% sequence identity thereto, and combination thereof.
2. The recombinant filamentous fungal cell of claim 1 comprising two inactivated chromosomal genes.
3. The recombinant filamentous fungal cell of claim 2 , wherein the two inactivated chromosomal genes are mnn9 (SEQ ID NO:7) and ochA (SEQ ID NO:11), or functionally homologous sequences thereto having at least 95% sequence identity thereto.
4. The recombinant filamentous fungal cell of claim 1 , wherein the inactivated chromosomal gene is mnn9 (SEQ ID NO:7) and homologous sequences thereof having at least 95% sequence identity thereto.
5. The recombinant filamentous fungal cell of claim 4 further comprising a second inactivated chromosomal gene.
6. The recombinant filamentous fungal cell of claim 1 , wherein the one or more inactivated chromosomal genes selected from derA (SEQ ID NO:1), derB (SEQ ID NO:3), htmA (SEQ ID NO:5), mnn9 (SEQ ID NO:7), mnn10 (SEQ ID NO:9), ochA (SEQ ID NO:11), dpp4 (SEQ ID NO:13), and functionally homologous sequences thereof having at least 95% sequence identity thereto.
7. The recombinant filamentous fungal cell of claim 6 , further comprising an inactivated chromosomal gene selected from pepAa (SEQ ID NO:17), pepAb (SEQ ID NO:19), pepAc (SEQ ID NO:31, pepAd (SEQ ID NO:21), pepF (SEQ ID NO:23); and functionally homologous sequences thereto having at least 95% sequence identity.
8. The recombinant filamentous fungal cell of claim 1 , wherein said filamentous fungal cell is an Aspergillus cell.
9. The recombinant filamentous fungal cell of claim 1 , further comprising an inactivated pepA.
10. The recombinant filamentous fungal cell of claim 1 , wherein the inactivated gene has been deleted.
11. The recombinant fungal cell of claim 1 , wherein the inactivated gene has been disrupted.
12. The recombinant filamentous fungal cell of claim 1 , further comprising an inactivated gene selected from pepB (SEQ ID NO:25), pepC (SEQ ID NO:27), pepD (SEQ ID NO:29) and sequences having at least 95% sequence identity thereto, and combinations thereof.
13. The recombinant filamentous fungal cell of claim 1 further comprising an introduced nucleic acid which encodes a protein of interest.
14. The recombinant filamentous fungal cell of claim 13 , wherein the protein of interest is an enzyme.
15. The recombinant filamentous fungal cell of claim 13 , wherein the protein of interest is a protease inhibitor.
16. The recombinant filamentous fungal cell of claim 13 , wherein the protein of interest is an antibody of fragment thereof.
17. An isolated nucleic acid encoding a protein having an amino acid sequence selected from the group of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:10, SEQ ID NO:12 and functionally homologous sequences having at least 95% sequence identity thereto.
18. The isolated nucleic acid sequence of claim 17 , wherein the nucleic acid sequence is selected from the group of sequences corresponding to SEQ ID NO:1, SEQ ID NO:3, SEQ ID NO:5, SEQ ID NO:7, SEQ ID NO:9 and SEQ ID NO:11.