Claims
- 1. A method of constructing a variant of a parent Coprinus-like laccase, which variant has laccase activity and improved storage stability as compared to said parent laccase, said method comprising
- i) comparing the three-dimensional structure of the Coprinus laccase of SEQ ID NO:1 depicted in the Appendix 1 with the structure of the Coprinus-like laccase,
- ii) identifying a part of the Coprinus-like laccase structure which is different from the Coprinus laccase structure and responsible for differences in the storage stability of the Coprinus and Coprinus-like laccase,
- iii) modifying the part of the Coprinus-like laccase identified in ii) whereby a Coprinus-like laccase variant is obtained, which has an improved storage stability compared to the parent Coprinus-like laccase, and optionally,
- iv) testing the resulting Coprinus-like laccase variant with respect to storage stability.
- 2. The method according to claim 1, wherein, in step iii), the part of the Coprinus-like laccase is modified to correspond to the structure of the Coprinus laccase.
- 3. The method according to claim 1, wherein, in step iii), the modification is accomplished by:
- (a) deleting one or more amino acid residues of the part of the Coprinus-like laccase to be modified;
- (b) replacing one or more amino acid residues of the part of the Coprinus-like laccase to be modified with the amino acid residues occupying corresponding positions in the Coprinus laccase; or
- (c) inserting one or more amino acid residues present in the Coprinus laccase into a corresponding position in the Coprinus-like laccase.
- 4. The method according to claim 1, wherein the Coprinus-like laccase is selected from the group consisting of Polyporus pinsitus laccase, Phlebia radiata laccase, Rhizoctonia solani laccase, Scytalidium thermophilum laccase and Myceliophthora thermophila laccase.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1449/96 |
Dec 1996 |
DKX |
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1021/97 |
Sep 1997 |
DKX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of application Ser. No. 08/993,318 filed on Dec. 18, 1997, now U.S. Pat. No. 5,998,353 and claims priority of U.S. provisional application No. 60/035,413 filed Jan. 23, 1997 under 35 U.S.C. 119 and Danish application Nos. 1449/96 and 1021/97 filed Dec. 19, 1996 and Sep. 8, 1997, the contents of which are fully incorporated herein by reference.
Foreign Referenced Citations (6)
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Country |
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Mar 1995 |
WOX |
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WOX |
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WOX |
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WOX |
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Non-Patent Literature Citations (2)
Entry |
Xu, F. et al. (1996) Biochimica et Biophysica Acta 1292:303-311. |
Soon-ja, K. and Choi, H.T. (1995) FEMS Microbiology Letters 132:177-179. |
Divisions (1)
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Number |
Date |
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Parent |
993318 |
Dec 1997 |
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