Aspergillus niger transformation system
First Claim
1. A process for transforming Aspergillus niger, said process comprising the steps of:
- treating an Aspergillus niger strain with recombinant DNA under conditions permitting at least some of said Aspergillus niger to take up said recombinant DNA and form transformants wherewith; and
selecting resulting Aspergillus niger transformants.
6 Assignments
0 Petitions
Accused Products
Abstract
Transformants of Aspergillus niger and related Aspergilli, containing foreign DNA conferring modified properties of expression thereon, are prepared by use of a DNA vector which contains a selectable marker which is capable of incorporation into the DNA of the host A. niger cells, but which is not to be found in the A. niger cells prior to this transformation. The vector also contains other foreign DNA to be incorporated into the A. niger, for modified expression. The process suitably uses mutants of A. niger as hosts, the mutants lacking the selectable marker as compared with wild type A. niger, and conducts the transformation on spheroplasts of A. niger.
42 Citations
22 Claims
-
1. A process for transforming Aspergillus niger, said process comprising the steps of:
-
treating an Aspergillus niger strain with recombinant DNA under conditions permitting at least some of said Aspergillus niger to take up said recombinant DNA and form transformants wherewith; and selecting resulting Aspergillus niger transformants. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A plasmid selected from the group consisting of pDG1 (ATCC 53005) and pDG3 (ATCC 53006).
-
16. Transformed Aspergillus niger comprising recombinant DNA.
-
17. Aspergillus niger ATCC 20739 transformed by Aspergillus nidulans argB gene.
-
18. A method for obtaining Aspergillus niger transformants, said method comprising the steps of:
-
enzymatically removing the cell wall of Aspergillus niger; adding exogenous DNA to the resultant Aspergillus niger spheroplasts; incubating the spheroplasts and exogenous DNA under conditions permitting some of the spheroplasts to take up exogenous DNA; and isolating resulting Aspergillus niger transformants. - View Dependent Claims (19, 20, 21, 22)
-
Specification