Patents by Inventor Byung-Kwon Choi

Byung-Kwon Choi 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: 20150079633
    Abstract: The present invention relates to lower eukaryotic host cells having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar and sugar nucleotide transporters to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified lipid-linked oligosaccharides are created or selected. N-glycans made in the engineered host cells exhibit GnTIV, GnTV, GnT VI or GnTIX activity, which produce multiantennary N-glycan structures and may be modified further by heterologous expression of one or more enzymes, e.g., glycosyltransferases, sugar, sugar nucleotide transporters, to yield human-like glycoproteins. For the production of therapeutic proteins, this method may be adapted to engineer cell lines in which any desired glycosylation structure may be obtained.
    Type: Application
    Filed: July 25, 2014
    Publication date: March 19, 2015
    Inventors: Piotr Bobrowicz, Stephen R. Hamilton, Tillman U. Gerngross, Stefan Wildt, Byung-Kwon Choi, Juergen Hermann Nett, Robert C. Davidson
  • Publication number: 20150051381
    Abstract: The present invention relates to eukaryotic host cells having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar transporters and mannosidases to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The invention provides nucleic acid molecules and combinatorial libraries which can be used to successfully target and express mammalian enzymatic activities such as those involved in glycosylation to intracellular compartments in a eukaryotic host cell. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified oligosaccharides are created or selected. N-glycans made in the engineered host cells have a Man5GlcNAc2 core structure which may then be modified further by heterologous expression of one or more enzymes, e.g.
    Type: Application
    Filed: August 7, 2014
    Publication date: February 19, 2015
    Inventors: Tillman U. Gerngross, Stefan Wildt, Byung-kwon Choi, Juergen Hermann Nett, Piotr Bobrowicz, Stephen R. Hamilton, Robert C. Davidson
  • Publication number: 20140342932
    Abstract: Systems for making, identifying, and selecting recombinant cells that express a ligand for the insulin receptor (IR) or insulin growth factor I (IGF-1) receptor are described. In general, libraries of recombinant cells are constructed that are capable of displaying a plurality of ligand molecules on the cell surface. Recombinant cells that display a ligand in a form accessible for binding to the IR and/or IGF-1 receptor can be detected and the recombinant cells displaying said ligands can be selected and isolated using cell sorting technologies. In particular aspects, the system is useful for constructing and screening libraries of recombinant cells that express and displaying insulin analogue precursors molecules to identify and select recombinant cells in the library that bind the IR and/or IGF-1 receptor with a desired affinity and/or avidity.
    Type: Application
    Filed: September 18, 2012
    Publication date: November 20, 2014
    Inventors: Ming-Tang Chen, Byung-Kwon Choi, Song Lin, Natarajan Sethuraman, Hussam Shaheen, Terrance Stadheim, Dongxing Zha
  • Patent number: 8883483
    Abstract: The present invention relates to eukaryotic host cells having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar transporters and mannosidases to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The invention provides nucleic acid molecules and combinatorial libraries which can be used to successfully target and express mammalian enzymatic activities such as those involved in glycosylation to intracellular compartments in a eukaryotic host cell. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified oligosaccharides are created or selected. N-glycans made in the engineered host cells have a Man5GlcNAc2 core structure which may then be modified further by heterologous expression of one or more enzymes, e.g.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: November 11, 2014
    Assignee: GlycoFi, Inc.
    Inventors: Tillman U. Gerngross, Stefan Wildt, Byung-kwon Choi, Juergen Nett, Piotr Bobrowicz, Stephen Hamilton, Robert Davidson
  • Publication number: 20140329276
    Abstract: Methods for increasing the yield and N-glycosylation site occupancy of paucimannose or complex N-glycans of recombinant glycoproteins produced in a recombinant host cell lacking dolichyl-P-Man:Man5GlcNAc2-PP-dolichyl alpha-1,3 mannosyltransferase (Alg3p) activity are disclosed. In particular, recombinant host cells are provided that comprise a disruption of the expression of an OS-9 family gene in the host cell. These recombinant host cells may then be used for producing recombinant glycoproteins. In further embodiments, the recombinant host cells further overexpress at least one heterologous single-subunit oligosaccharyltransferase, which in particular embodiments is capable of functionally suppressing the lethal phenotype of a mutation of at least one essential protein of the yeast oligosaccharyltransferase (OTase) complex.
    Type: Application
    Filed: October 23, 2012
    Publication date: November 6, 2014
    Applicant: MERCK SHARP & DOHME CORP.
    Inventors: Byung-Kwon Choi, Stephen R. Hamilton, Natarajan Sethuraman
  • Patent number: 8877462
    Abstract: The present invention relates to eukaryotic host cells having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar transporters and mannosidases to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The invention provides nucleic acid molecules and combinatorial libraries which can be used to successfully target and express mammalian enzymatic activities such as those involved in glycosylation to intracellular compartments in a eukaryotic host cell. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified oligosaccharides are created or selected. N-glycans made in the engineered host cells have a Man5GlcNAc2 core structure which may then be modified further by heterologous expression of one or more enzymes, e.g.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: November 4, 2014
    Assignee: GlycoFi, Inc.
    Inventors: Tillman U. Gerngross, Stefan Wildt, Byung-kwon Choi, Juergen Hermann Nett, Piotr Bobrowicz, Stephen R. Hamilton, Robert C. Davidson
  • Publication number: 20140303643
    Abstract: A surgical robot system includes a slave device provided with a surgical instrument and a master device to control motion of the surgical instrument. The master device includes a master manipulation module having a manipulation tool, to which a pose recognizer is attached, and a master control module that estimates a pose of the manipulation tool using pose information acquired via the pose recognizer, generates a surgical instrument pose control signal corresponding to the estimated pose of the manipulation tool, and transmits the control signal to the slave device.
    Type: Application
    Filed: September 18, 2013
    Publication date: October 9, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Tae Sin Ha, Won Jun Ko, Young Do Kwon, Gyung Rock Kim, Byung Kwon Choi
  • Publication number: 20140287463
    Abstract: The present invention relates to novel engineered Pichia strains with improved fermentation yields for expressing heterologous proteins with improved N-glycosylation quality, as well as to methods of generating such strains.
    Type: Application
    Filed: October 24, 2012
    Publication date: September 25, 2014
    Inventors: Ming-Tang Chen, Byung-Kwon Choi
  • Publication number: 20140257330
    Abstract: A surgical robot system capable of storing all data transmitted and received in the surgical robot system and a method of controlling the same includes a slave device performing surgery on a patient, a master device controlling a surgical operation of the slave device, an imaging device transmitting a medical image regarding the patient to the slave device and the master device, and a monitoring device comprising a storage module receiving all data transmitted and received among the slave device, the master device, and the imaging device, serializing the received data on a per transmission-time-information basis to generate serial packets, and storing the generated serial packets, and a reproduction module dividing the stored serial packets into a plurality of unit packets and transmitting the unit packets to a device for display.
    Type: Application
    Filed: October 10, 2013
    Publication date: September 11, 2014
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Byung Kwon CHOI, Kyung Shik Roh, Tae Sin Ha
  • Patent number: 8823339
    Abstract: The present invention relates to a switch control circuit, a switch control method, and a converter using the same. An input voltage rectified from an AC input in a converter is transmitted to an inductor, and output power is generated from an inductor current by the input voltage. The converter includes a power switch connected to the inductor to control the inductor current and a sense resistor having a first end connected to a ground and a second end connected to the AC input. At a time point that a sense voltage generated in the sense voltage reaches the peak point and then decreased to an on-reference voltage, the power switch is turned on. The on-reference voltage is a sense voltage at a resonance start time point between a parasite capacitor of the power switch and the inductor.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: September 2, 2014
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Jae-Yong Lee, Byung Kwon Choi, Young-Je Lee, Ilyong Jung
  • Patent number: 8815544
    Abstract: The present invention provides a novel lower eukaryotic host cell producing human-like glycoproteins characterized as having a terminal ?-galactose residue and essentially lacking fucose and sialic acid residues. The present invention also provides a method for catalyzing the transfer of a galactose residue from UDP-galactose onto an acceptor substrate in a recombinant lower eukaryotic host cell, which can be used as a therapeutic glycoprotein.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: August 26, 2014
    Assignee: Glycofi, Inc.
    Inventors: Robert Davidson, Tillman Gerngross, Stefan Wildt, Byung-Kwon Choi, Juergen Hermann Nett, Piotr Bobrowicz, Stephen Robin Hamilton
  • Publication number: 20140227290
    Abstract: Described is a method for increasing the N-glycosylation site occupancy of a therapeutic glycoprotein produced in recombinant host cells modified as described herein and genetically engineered to express the glycoprotein compared to the N-glycosylation site occupancy of the therapeutic glycoprotein produced in a recombinant host cell not modified as described herein. In particular, the method provides recombinant host cells that overexpress a heterologous single-subunit oligosaccharyltransferase, which in particular embodiments is capable of functionally suppressing the lethal phenotype of a mutation of at least one essential protein of the yeast oligosaccharyltransferase (OTase) complex, for example, the Leishmania major STT3D protein, in the presence of expression of the host cell genes encoding the endogenous OTase complex.
    Type: Application
    Filed: February 17, 2014
    Publication date: August 14, 2014
    Applicant: Merck Sharp & Dohme Corp.
    Inventors: Natarajan Sethuraman, Byung-Kwon Choi, Bianka Prinz, Michael Meehl, Terrance Stadheim
  • Patent number: 8771989
    Abstract: Lower eukaryote host cells in which an endogenous or heterologous Ca2+ ATPase is overexpressed are described. Also described are lower eukaryote host cells in which a calreticulin and/or ERp57 protein are overexpressed. These host cells are useful for producing recombinant glycoproteins that have reduced O-glycosylation.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: July 8, 2014
    Assignee: GlycoFi, Inc.
    Inventor: Byung-Kwon Choi
  • Patent number: 8715963
    Abstract: Described is a method for increasing the N-glycosylation site occupancy of a therapeutic glycoprotein produced in recombinant host cells modified as described herein and genetically engineered to express the glycoprotein compared to the N-glycosylation site occupancy of the therapeutic glycoprotein produced in a recombinant host cell not modified as described herein. In particular, the method provides recombinant host cells that overexpress a heterologous single-subunit oligosaccharyltransferase, which in particular embodiments is capable of functionally suppressing the lethal phenotype of a mutation of at least one essential protein of the yeast oligosaccharyltransferase (OTase) complex, for example, the Leishmania major STT3D protein, in the presence of expression of the host cell genes encoding the endogenous OTase complex.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: May 6, 2014
    Assignee: Merck Sharp & Dohme Corp.
    Inventors: Natarajan Sethuraman, Byung-Kwon Choi, Bianka Prinz, Michael Meehl, Terrance Stadheim
  • Patent number: 8697394
    Abstract: The present invention relates to eukaryotic host cells, especially lower eukaryotic host cells, having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar and sugar nucleotide transporters to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified lipid-linked oligosaccharides are created or selected. N-glycans made in the engineered host cells exhibit GnTIII, GnTIV, GnTV, GnT VI or GnTIX activity, which produce bisected and/or multiantennary N-glycan structures and may be modified further by heterologous expression of one or more enzymes, e.g., glycosyltransferases, sugar, sugar nucleotide transporters, to yield human-like glycoproteins.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: April 15, 2014
    Assignee: Glycofi, Inc.
    Inventors: Piotr Bobrowicz, Stephen R. Hamilton, Tillman U. Gerngross, Stefan Wildt, Byung-Kwon Choi, Juergen Hermann Nett, Robert C. Davidson
  • Patent number: 8698965
    Abstract: A robot rotates frontward, rearward, clockwise, or counterclockwise such that a display device is matched with the eye position of a user. The robot includes a body, a display device, and at least one bending device. The display device includes a recognition unit to rotate about the body according to the position of the user. The recognition unit detects a position of a user. The bending device couples the body with the display device such that the body and the display device rotate frontward, rearward, clockwise, or counterclockwise according to a detection state of the recognition unit.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: April 15, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Byung Kwon Choi, Woo Sup Han, Yong Jae Kim, Tae Sin Ha
  • Publication number: 20130316403
    Abstract: Lower eukaryote host cells in which an endogenous or heterologous Ca2+ ATPase is overexpressed are described. Also described are lower eukaryote host cells in which a calreticulin and/or ERp57 protein are overexpressed. These host cells are useful for producing recombinant glycoproteins that have reduced O-glycosylation.
    Type: Application
    Filed: July 10, 2013
    Publication date: November 28, 2013
    Applicant: GlycoFi, Inc.
    Inventor: Byung-Kwon Choi
  • Patent number: 8588978
    Abstract: Disclosed is a robot setting a display unit corresponding to an eye level of the user. The robot includes a body unit, a display unit, and at least one sliding section. The display unit is provided with a detection unit, which detects a position of a user, to rotate together with the body unit according to an eye level of the user. The sliding section connects the body unit with the display unit such that the body unit and the display unit rotate longitudinally and transversely according to a detection result of the detection unit.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: November 19, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Byung Kwon Choi, Woo Sup Han, Yong Jae Kim
  • Patent number: 8564257
    Abstract: The present invention relates to a power factor correction circuit and a driving method thereof. The power factor correction circuit includes a power switch controlling an inductor current flowing in an inductor, an auxiliary inductor coupled to the inductor with a predetermined turn ratio, and a power factor correction controller controlling output power by controlling a switching operation of the power switch. The power factor correction controller determines whether or not an output voltage of the output power is an over-voltage by using the sum of a source current and a sink current that control a zero current detection voltage to be included within a predetermined clamping range, the zero current detection voltage corresponding to an auxiliary voltage that is a both-end voltage of an auxiliary inductor.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: October 22, 2013
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Young-Bae Park, Sang Cheol Moon, Byoung Heon Kim, Byung Kwon Choi, Cheng Sung Chen
  • Publication number: 20130217067
    Abstract: The present invention relates to eukaryotic host cells having modified oligosaccharides which may be modified further by heterologous expression of a set of glycosyltransferases, sugar transporters and mannosidases to become host-strains for the production of mammalian, e.g., human therapeutic glycoproteins. The invention provides nucleic acid molecules and combinatorial libraries which can be used to successfully target and express mammalian enzymatic activities such as those involved in glycosylation to intracellular compartments in a eukaryotic host cell. The process provides an engineered host cell which can be used to express and target any desirable gene(s) involved in glycosylation. Host cells with modified oligosaccharides are created or selected. N-glycans made in the engineered host cells have a Man5GlcNAc2 core structure which may then be modified further by heterologous expression of one or more enzymes, e.g.
    Type: Application
    Filed: February 29, 2012
    Publication date: August 22, 2013
    Applicant: GlycoFi, Inc.
    Inventors: TILLMAN U. GERNGROSS, Stefan Wildt, Byung-kwon Choi, Juergen Hermann Nett, Piotr Bobrowicz, Stephen R. Hamilton, Robert C. Davidson