United States of America, As Represented by the Secretary of Agriculture

Cornell Research Foundation Inc.

United States Department of Agriculture

Abul H J Ullah

Edward J Mullaney

Xingen Lei

Xin Gen Lei

Disclosed herein is site-directed mutagenesis of a cloned phyA gene employed to replaced cysteine residues involved in disulfide bridge formation with another amino acid. Also disclosed herein is an isolated mutant phytase comprising an amino acid sequence having at least 96 percent sequence identity to SEQ. ID. NO: 6 and containing a double-substitution amino acid residue substitution of residue 31 and residue 40 of SEQ. ID. NO: 6, wherein said isolated mutant phytase has phytase activity.

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The present invention invention relates to an isolated nucleic acid molecule encoding a mutant phytase and the isolated mutant phytase itself. The present invention further relates to methods of using the isolated nucleic acid molecule and the isolated mutant phytase of the present invention.

Growing community of inventors

Slidell, LA, United States of America

Abul H J Ullah