Patents by Inventor Joanne Y. Shyr

Joanne Y. Shyr has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Carotenoid ketolase genes with improved ketocarotenoid yield
    Patent number: 7425625
    Abstract: Protein engineered CrtO ketolases isolated from Rhodococcus erythropolis AN12 are provided having increased carotenoid ketolase activity. Methods using the present CrtO ketolases are also provided for increasing ketocarotenoid production in suitable production hosts.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: September 16, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Xiao-Song Tang, Qiong Cheng, Luan Tao, Joanne Y. Shyr
  • Bioproduction of astaxanthin using mutant carotenoid ketolase and carotenoid hydroxylase genes
    Patent number: 7074604
    Abstract: Protein engineered nucleic acid fragments encoding a CrtO ketolase and a CrtZ hydroxylase are provided with increased astaxanthin synthesis activity. Methods using the present nucleic acid fragments are also provided for increasing or altering astaxanthin production in suitable production hosts.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: July 11, 2006
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Xiao-Song Tang, Qiong Cheng, Joanne Y. Shyr, Luan Tao