Fungal cellulase composition containing alkaline CMC-endoglucanase and essentially no cellobiohydrolase and method of making thereof
First Claim
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1. A method for producing a cellulase preparation which comprises a substantially homogeneous endoglucanase, comprising:
- (a) introducing a recombinant DNA vector carrying a first DNA sequence encoding the endoglucanase operably linked to control sequences permitting the expression of said first DNA sequence into a host cell;
(b) cultivating the host cell in a culture medium under conditions permitting the expression of the endoglucanase; and
(c) recovering the endoglucanase from the culture medium;
wherein the endoglucanase is endogenous to a strain of Myceliophthora, Fusarium or Humicola and(i) has a pH optimum of about 7.5-10.0;
(ii) exhibits a carboxymethylcellulose (CMC) endoase activity of at least about 10 CMC-endoase units per mg of total protein;
(iii) exhibits a cellulose affinity viscosity unit (CAVU) activity of at least about 50% at a pH of 7.0-12.0; and
(iv) has essentially no cellobiohydrolase activity.
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Abstract
A cellulase preparation useful for reducing the harshness of cotton-containing fabrics and for reducing the rate at which such fabrics become harsh comprises about 40% or more (based on the total protein content) of an endoglucanase component with a pH optimum of about 7.5-10.0 with a high CMC-endoase activity and affinity towards cellulose and essentially no cellobiohydrolase activity. The cellulase composition is endogenous to a strain of Humicola, Myceliophthora, or Fusarium. A method for the recombinant production of said cellulase preparation is provided.
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21 Claims
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1. A method for producing a cellulase preparation which comprises a substantially homogeneous endoglucanase, comprising:
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(a) introducing a recombinant DNA vector carrying a first DNA sequence encoding the endoglucanase operably linked to control sequences permitting the expression of said first DNA sequence into a host cell; (b) cultivating the host cell in a culture medium under conditions permitting the expression of the endoglucanase; and (c) recovering the endoglucanase from the culture medium; wherein the endoglucanase is endogenous to a strain of Myceliophthora, Fusarium or Humicola and (i) has a pH optimum of about 7.5-10.0; (ii) exhibits a carboxymethylcellulose (CMC) endoase activity of at least about 10 CMC-endoase units per mg of total protein; (iii) exhibits a cellulose affinity viscosity unit (CAVU) activity of at least about 50% at a pH of 7.0-12.0; and (iv) has essentially no cellobiohydrolase activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification