Patents by Inventor Wu-Kuang Yeh

Wu-Kuang Yeh 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).

  • Patent number: 5714363
    Abstract: Deacetoxycephalosporin C hydroxylase is obtained in purified form from crude cell-free extracts via chromatography over a weak anionic exchange resin, ammonium sulfate fractionation, gel filtration, hydroxylapatite chromatography, and FPLC. The enzyme is obtained in >90% purity by further gel filtration and a second FPLC. The 28-residue amino-terminal sequence of hydroxylase is provided as well as a 9-residue amino-terminal sequence of an internal sequence and a 3-residue carboxy-terminal sequence. In addition to the efficient conversion of DAOC to DAC, the hydroxylase provided herein converts 7.beta.-(.alpha.-aminoadipamido)-3-exomethylenecepham-4-carboxylic acid to DAC.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: February 3, 1998
    Assignee: Eli Lilly and Company
    Inventors: Wu-Kuang Yeh, Joe E. Dotzlaf
  • Patent number: 5573936
    Abstract: Echinocandin B deacylase is purified to near homogeneity from Actinoplanes utahensis by a process comprising, in order, extracting the soluble enzyme, heating to 60.degree. C., hydrophobic interaction chromatography, (NH.sub.4).sub.2 SO.sub.4 fractionation, gel filtration, cation exchange chromatography, dye-ligand chromatography, gel filtration, and cation-exchange chromatography.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: November 12, 1996
    Assignee: Eli Lilly and Company
    Inventors: Adam J. Kreuzman, Wu-Kuang Yeh
  • Patent number: 5508177
    Abstract: The present invention provides processes for isolating in substantially purified form water-soluble penicillin binding protein 2a of Staphylococcus aureus.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: April 16, 1996
    Assignee: Eli Lilly and Company
    Inventors: Joe E. Dotzlaf, Sandhya K. Ghag, Wu-Kuang Yeh
  • Patent number: 5082772
    Abstract: Deacetoxycephalosporin C synthase obtained from cell-free extracts of Streptomyces clavuligerus was purified to near homogeneity and characterized in inactive form. The amino acid sequence was determined and the synthase recombinantly reproduced in active form in E. coli. The recombinantly produced synthase is provided in about 97% pure form by a chromatographic process. The synthase lacks DAOC hydroxylase function; however, it possesses the ability to transform 3-exomethylenocephalosporin C to deacetylcephalosporin C.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: January 21, 1992
    Assignee: Eli Lilly and Company
    Inventors: Joe E. Dotzlaf, Wu-Kuang Yeh
  • Patent number: 4753881
    Abstract: Deacetoxycephalosporin C synthetase is provided in purified form via chromatography of crude cell-free extracts over a weak anion exchange resin followed by gel filtration and hydroxylapatite chromatography, all carried out in the presence of glycerol, a C.sub.1 -C.sub.3 alkyl monohydric alcohol, e.g., ethanol, a sulfhydryl containing reducing agent, e.g., dithiothreitol, and ascorbate. The purified enzyme which possesses both expandase and hydroxylase activities can be further purified by chromatography over a strong anion exchange resin.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: June 28, 1988
    Assignee: Eli Lilly and Company
    Inventors: Wu-Kuang Yeh, Joe E. Dotzlaf