Patents by Inventor Zhixin Shao

Zhixin Shao 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).

  • Publication number: 20230265204
    Abstract: The present invention relates to proteins, particularly antibodies such as anti-CD20/anti-CD3 bispecific antibodies and anti ?-synuclein antibodies, having monogalactosylated (G1) and digalactosylated (G2) glycans. More particular, the present invention relates to galactosylation engineering to generate proteins with improved therapeutic properties, including proteins with increased titer. Further, the invention relates to a cell culture medium and a mammalian cell as well as methods using said cell culture medium and said mammalian cell for producing said proteins. Moreover, the present invention relates to the use of said antibodies as a medicament such as for the treatment of cancer, particularly cancer associated with B-cells, or Parkinson's disease.
    Type: Application
    Filed: April 23, 2021
    Publication date: August 24, 2023
    Inventor: Zhixin SHAO
  • Publication number: 20200385673
    Abstract: Processes for culturing mammalian cells, and for producing recombinant products expressed by mammalian cells, involving a pH up-shift are provided. The processes are particularly suitable for industrial-scale cell culture, and for culture of cells that produce therapeutic products. The processes comprise a first culture stage, carried out at a first pH, and a second culture stage, carried out at a second pH that is higher than the first pH.
    Type: Application
    Filed: November 29, 2018
    Publication date: December 10, 2020
    Inventors: Katrin GREPPMAIR, Thomas LINK, Zhixin SHAO
  • Patent number: 7790381
    Abstract: The invention provides methods for evolving a polynucleotide toward acquisition of a desired property. Such methods entail incubating a population of parental polynucleotide variants under conditions to generate annealed polynucleotides comprising heteroduplexes. The heteroduplexes are then exposed to a cellular DNA repair system to convert the heteroduplexes to parental polynucleotide variants or recombined polynucleotide variants. The resulting polynucleotides are then screened or selected for the desired property.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: September 7, 2010
    Assignee: California Institute of Technology
    Inventors: Frances Arnold, Zhixin Shao, Alexander Volkov
  • Patent number: 7547535
    Abstract: The present invention relates to improved variants of soluble pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenases (s-GDH), to genes encoding mutated s-GDH, to mutant proteins of s-GDH with improved substrate specificity for glucose, and to different applications of these s-GDH variants, particularly for determining concentrations of sugar, especially of glucose in a sample.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: June 16, 2009
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Peter Kratzsch, Rainer Schmuck, Daniela Beck, Zhixin Shao, Detlef Thym, Wolfgang-Reinhold Knappe
  • Patent number: 7517664
    Abstract: The present invention relates to oxidoreductase apoenzyme variants which are enzymatically inactive but have coenzyme-binding properties. Further, the present invention relates to DNA sequences encoding these oxidoreductase apoenzyme variants, expression vectors containing such DNA sequences and the use of these oxidoreductase apoenzyme variants in diagnostic applications.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: April 14, 2009
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Zhixin Shao, Joachim Hoenes, Carina Horn, Wolfgang-Reinhold Knappe, Rainer Schmuck
  • Publication number: 20080268505
    Abstract: The invention provides methods for evolving a polynucleotide toward acquisition of a desired property. Such methods entail incubating a population of parental polynucleotide variants under conditions to generate annealed polynucleotides comprising heteroduplexes. The heteroduplexes are then exposed to a cellular DNA repair system to convert the heteroduplexes to parental polynucleotide variants or recombined polynucleotide variants. The resulting polynucleotides are then screened or selected for the desired property.
    Type: Application
    Filed: December 7, 2006
    Publication date: October 30, 2008
    Applicant: California Institute of Technology
    Inventors: Frances Arnold, Zhixin Shao, Alexander Volkov
  • Publication number: 20070087398
    Abstract: The present invention relates to oxidoreductase apoenzyme variants which are enzymaticaily inactive but have coenzyme-binding properties. Further, the present invention relates to DNA sequences encoding these oxidoreductase apoenzyme variants, expression vectors containing such DNA sequences and the use of these oxidoreductase apoenzyme variants in diagnostic applications.
    Type: Application
    Filed: November 14, 2006
    Publication date: April 19, 2007
    Inventors: Zhixin Shao, Joachim Hoenes, Carina Horn, Wolfgang-Reinhold Knappe, Rainer Schmuck
  • Patent number: 7172890
    Abstract: The present invention relates to oxidoreductase apoenzyme variants which are enzymatically inactive but have coenzyme-binding properties. Further, the present invention relates to DNA sequences encoding these oxidoreductase apoenzyme variants, expression vectors containing such DNA sequences and the use of these oxidoreductase apoenzyme variants in diagnostic applications.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: February 6, 2007
    Assignee: Roche Diagnostics GmbH
    Inventors: Zhixin Shao, Joachim Hoenes, Carina Horn, Wolfgang-Reinhold Knappe, Rainer Schmuck
  • Patent number: 7166466
    Abstract: The invention provides methods for evolving a polynucleotide toward acquisition of a desired property. Such methods entail incubating a population of parental polynucleotide variants under conditions to generate annealed polynucleotides comprising heteroduplexes. The heteroduplexes are then exposed to a cellular DNA repair system to convert the heteroduplexes to parental polynucleotide variants or recombined polynucleotide variants. The resulting polynucleotides are then screened or selected for the desired property.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: January 23, 2007
    Assignee: California Institute of Technology
    Inventors: Frances Arnold, Zhixin Shao, Alexander Volkov
  • Patent number: 7132270
    Abstract: The present invention relates to improved variants of soluble pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenases (s-GDH), to genes encoding mutated s-GDH, to mutant proteins of s-GDH with improved substrate specificity for glucose, and to different applications of these s-GDH variants, particularly for determining concentrations of sugar, especially of glucose in a sample.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: November 7, 2006
    Assignee: Roche Diagnostics GmbH
    Inventors: Peter Kratzsch, Rainer Schmuck, Daniela Beck, Zhixin Shao, Detlef Thym, Wolfgang-Reinhold Knappe
  • Publication number: 20060148056
    Abstract: The present invention relates to improved variants of soluble pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenases (s-GDH), to genes encoding mutated s-GDH, to mutant proteins of s-GDH with improved substrate specificity for glucose, and to different applications of these s-GDH variants, particularly for determining concentrations of sugar, especially of glucose in a sample.
    Type: Application
    Filed: December 9, 2005
    Publication date: July 6, 2006
    Inventors: Peter Kratzsch, Rainer Schmuck, Daniela Beck, Zhixin Shao, Detlef Thym, Wolfgang-Reinhold Knappe
  • Publication number: 20060094099
    Abstract: The present invention relates to oxidoreductase apoenzyme variants which are enzymatically inactive but have coenzyme-binding properties. Further, the present invention relates to DNA sequences encoding these oxidoreductase apoenzyme variants, expression vectors containing such DNA sequences and the use of these oxidoreductase apoenzyme variants in diagnostic applications.
    Type: Application
    Filed: October 28, 2004
    Publication date: May 4, 2006
    Inventors: Zhixin Shao, Joachim Hoenes, Carina Horn, Wolfgang-Reinhold Knappe, Rainer Schmuck
  • Patent number: 6958231
    Abstract: The present invention relates to mutated genes encoding variants of an Erwinia-type creatinase (EC 3.5.3.3, alternative name: creatine amidinohydrolase), to the creatinase variants encoded by these genes, and to different applications of these variants of creatinase, particularly to their use for determining the creatinine and/or creatine concentration in a sample.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: October 25, 2005
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Zhixin Shao, Rainer Schmuck, Peter Kratzsch, Janet Kenklies, Harald Weisser
  • Patent number: 6905689
    Abstract: A conjugate of a tissue non-specific alkaline phosphatase (tns-AP) and dextran which can be obtained by reacting unglycosylated tns-AP with activated dextran by incubation in aqueous solution, stopping the reaction and isolating the conjugate from the solution. The conjugate obtained in this manner is suitable as a standard for the determination of alkaline phosphatase.
    Type: Grant
    Filed: July 21, 2003
    Date of Patent: June 14, 2005
    Assignee: Roche Diagnostics Operations, Inc.
    Inventors: Bernd Schneidinger, Thomas Meier, Rainer Schmuck, Zhixin Shao
  • Publication number: 20040180340
    Abstract: The invention provides methods for evolving a polynucleotide toward acquisition of a desired property. Such methods entail incubating a population of parental polynucleotide variants under conditions to generate annealed polynucleotides comprising heteroduplexes. The heteroduplexes are then exposed to a cellular DNA repair system to convert the heteroduplexes to parental polynucleotide variants or recombined polynucleotide variants. The resulting polynucleotides are then screened or selected for the desired property.
    Type: Application
    Filed: February 19, 2003
    Publication date: September 16, 2004
    Applicants: Maxygen, Inc., California Institute of Technology
    Inventors: Frances Arnold, Zhixin Shao, Alexander Volkov
  • Publication number: 20040082027
    Abstract: A conjugate of a tissue non-specific alkaline phosphatase (tns-AP) and dextran which can be obtained by reacting unglycosylated tns-AP with activated dextran by incubation in aqueous solution, stopping the reaction and isolating the conjugate from the solution. The conjugate obtained in this manner is suitable as a standard for the determination of alkaline phosphatase.
    Type: Application
    Filed: July 21, 2003
    Publication date: April 29, 2004
    Inventors: Bernd Schneidinger, Thomas Meier, Rainer Schmuck, Zhixin Shao
  • Publication number: 20040005683
    Abstract: The present invention relates to improved variants of soluble pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenases (s-GDH), to genes encoding mutated s-GDH, to mutant proteins of s-GDH with improved substrate specificity for glucose, and to different applications of these s-GDH variants, particularly for determining concentrations of sugar, especially of glucose in a sample.
    Type: Application
    Filed: December 13, 2002
    Publication date: January 8, 2004
    Inventors: Peter Kratzsch, Rainer Schmuck, Daniela Beck, Zhixin Shao, Detlef Thym, Wolfgang-Reinhold Knappe
  • Publication number: 20030119084
    Abstract: The present invention relates to mutated genes encoding variants of an Erwinia-type creatinase (EC 3.5.3.3, alternative name: creatine amidinohydrolase), to the creatinase variants encoded by these genes, and to different applications of these variants of creatinase, particularly to their use for determining the creatinine and/or creatine concentration in a sample.
    Type: Application
    Filed: September 20, 2002
    Publication date: June 26, 2003
    Inventors: Zhixin Shao, Rainer Schmuck, Peter Kratzsch, Janet Kenklies, Harald Weisser
  • Publication number: 20030104595
    Abstract: The present invention relates to improved variants of soluble pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenases (s-GDH), to genes encoding mutated s-GDH, to mutant proteins of s-GDH with improved substrate specificity for glucose, and to different applications of these s-GDH variants, particularly for determining concentrations of sugar, especially of glucose in a sample.
    Type: Application
    Filed: October 29, 2001
    Publication date: June 5, 2003
    Inventors: Peter Kratzch, Rainer Schmuck, Daniela Bunk, Zhixin Shao, Detlef Thym, Wolfgang-Reinhold Knappe
  • Patent number: 6537746
    Abstract: The invention provides methods for evolving a polynucleotide toward acquisition of a desired property. Such methods entail incubating a population of parental polynucleotide variants under conditions to generate annealed polynucleotides comprising heteroduplexes. The heteroduplexes are then exposed to a cellular DNA repair system to convert the heteroduplexes to parental polynucleotide variants or recombined polynucleotide variants. The resulting polynucleotides are then screened or selected for the desired property.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: March 25, 2003
    Assignee: Maxygen, Inc.
    Inventors: Frances Arnold, Zhixin Shao, Alexander Volkov