Expression system for novel pullulanase
First Claim
1. Process for the preparation of isolated Bacillus deramifcans pullulanase having N-terminal SEQ ID NO:
- 1 or a modified sequence derived therefrom that catalyzes hydrolysis of α
-1,6-glucosidic bonds, comprising isolation of a DNA fragment which codes for the pullulanase, insertion of this DNA fragment into a suitable vector, introduction of this vector into a suitable host or introduction of this DNA fragment into the chromosome of a suitable host, culture of this host, expression of the pullulanase and harvesting of the pullulanase.
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Abstract
The invention relates to a heat-stable pullulanase having the property of hydrolysing glucosidic bonds of the α-1,6 type in amylopectin and having an enzymatic activity in an acid medium and at a temperature of about 60° C.
The invention also relates to strains of microorganisms which produce this pullulanase and processes for the preparation of this pullulanase.
The invention also relates to the uses thereof and compositions comprising the product.
The invention also relates to a DNA molecule. The invention relates to an expression vector containing this DNA molecule and to a chromosomal integration vector containing this DNA molecule.
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Citations
22 Claims
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1. Process for the preparation of isolated Bacillus deramifcans pullulanase having N-terminal SEQ ID NO:
- 1 or a modified sequence derived therefrom that catalyzes hydrolysis of α
-1,6-glucosidic bonds, comprising isolation of a DNA fragment which codes for the pullulanase, insertion of this DNA fragment into a suitable vector, introduction of this vector into a suitable host or introduction of this DNA fragment into the chromosome of a suitable host, culture of this host, expression of the pullulanase and harvesting of the pullulanase.
- 1 or a modified sequence derived therefrom that catalyzes hydrolysis of α
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2. Isolated DNA molecule comprising the nucleotide sequence (SEQ ID NO:
- 10) which codes for the pullulanase of Bacillus deramificans or a modified sequence derived therefrom, wherein said modified sequence catalyses hydrolysis of α
-1,6-glucosidic bonds. - View Dependent Claims (3, 4, 7, 8)
- 10) which codes for the pullulanase of Bacillus deramificans or a modified sequence derived therefrom, wherein said modified sequence catalyses hydrolysis of α
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5. Expression vector pUBDEBRA1.
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6. Chromosomal integration vector pUBCDEBRA11DNSI.
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9. Transformed strain of Bacillus lichenformis comprising the expression vector pUBDEBRA1 or the chromosomal integration vector pUBCDEBRA11DNSI.
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10. A biologically pure culture of Bacillus licheniformis SE2 having accession number LMG P-14034.
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11. A process for the production of Bacillus deramificans pullulanase having N-terminal SEQ ID NO:
- 1 or a modified sequence derived therefrom that catalyzes hydrolysis of α
1,6-glucosidic bonds, comprising the steps of;isolating a DNA molecule encoding said pullulanase, inserting said DNA molecule into a suitable host, culturing the host in a suitable nutrient medium containing sources of carbon and nitrogen and mineral salts under aerobic conditions, and harvesting the pullulanase obtained. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- 1 or a modified sequence derived therefrom that catalyzes hydrolysis of α
Specification