CATALYTICALLY INACTIVE PROTEINS AND METHOD FOR RECOVERY OF ENZYMES FROM PLANT-DERIVED MATERIALS

摘要

An inactive xylanase molecule for the recovery of xylanase activity in plant- derived material containing active xylanase enzyme(s) and xylanase inhibitors. The inactive xylanase molecule of binds to xylanase inhibitors in the plant-derived material, thereby allowing accurate measurement of xylanase enzyme activity of the enzyme contained in the plant-derived material. The invention further includes amino acid molecules depicted by SEQ ID NOS. 4 through 112, wherein the catalytically active sites of each of the amino acids have been modified resulting in inactive xylanase molecules. A method of production of the inactive xylanase molecules includes expression of the inactive xylanase molecule in microbial or eukaryal (e.g., yeast including Pichia pastoris) host cell an expression cassette comprising a promoter operably linked to a nucleic acid molecule encoding the inactive xylanase molecule and using the expressed molecule in an assay to recover the xylanase enzyme activity in plant-derived material, for example, in plant-derived material such as animal feed.