XYLANASE DERIVED FROM A BACILLUS SPECIES, EXPRESSION VECTORS FOR SUCH XYLANASE AND OTHER PROTEINS, HOST ORGANISMS THEREFOR AND USE THEREOF

摘要

A purified xylanase derived from B. Pumilus PRL B12 isdisclosed. This xylanase is efficient for use in thebiobleaching of wood pulp, permitting a strong reduction in thequantity of chlorine used and AOX compounds produced in classicaland ECF wood pulp bleaching sequences as well as the quantity ofozone used in TCF sequences. The gene coding for the xylanasewas isolated and purified and used to construct an expressionvector therefor. A recombinant host strain of B. licheniformisis also disclosed which is efficient for expressing heterologousenzymes, including the xylanase when transformed by theexpression vector.