Patents by Inventor Sung Kwang Son

Sung Kwang Son 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).

  • METHOD FOR PRODUCING L-TRYPTOPHAN THROUGH ENHANCEMENT OF PREPHENATE DEHYDRATASE ACTIVITY
    Publication number: 20230134555
    Abstract: The present disclosure relates to a method for producing L-tryptophan through the enhancement of prephenate dehydratase (PheA) activity.
    Type: Application
    Filed: March 5, 2021
    Publication date: May 4, 2023
    Inventors: Chang Il SEO, Hyun Ah KIM, Sung Kwang SON, Ki Yong CHEONG, Moo Young JUNG, Tae Yeon KIM
  • L-tryptophan-exporting protein variant and method for producing L-tryptophan using the same
    Patent number: 11524981
    Abstract: The present disclosure relates to a protein variant having a tryptophan-exporting activity, an L-tryptophan-producing microorganism expressing the protein variant, and a method for producing L-tryptophan using the microorganism.
    Type: Grant
    Filed: March 20, 2020
    Date of Patent: December 13, 2022
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Moo Young Jung, Hyun Ah Kim, Chang Il Seo, Imsang Lee, Ji-won Kim, Tae Yeon Kim, Sung Kwang Son, Ki Yong Cheong
  • NOVEL L-TRYPTOPHAN-EXPORTING PROTEIN VARIANT AND METHOD FOR PRODUCING L-TRYPTOPHAN USING THE SAME
    Publication number: 20220009973
    Abstract: The present disclosure relates to a protein variant having a tryptophan-exporting activity, an L-tryptophan-producing microorganism expressing the protein variant, and a method for producing L-tryptophan using the microorganism.
    Type: Application
    Filed: March 20, 2020
    Publication date: January 13, 2022
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Moo Young Jung, Hyun Ah Kim, Chang Il Seo, Imsang Lee, Ji-won Kim, Tae Yeon Kim, Sung Kwang Son, Ki Yong Cheong
  • L-tryptophan exporter and method of producing L-tryptophan using the same
    Patent number: 10995378
    Abstract: The present disclosure relates to a microorganism producing L-tryptophan in which the microorganism is modified such that a protein having an L-tryptophan-exporting activity comprising the amino acid sequence of SEQ ID NO: 1 is expressed, and a method for producing L-tryptophan using the microorganism.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: May 4, 2021
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Moo Young Jung, Chang Il Seo, Hyo Jin Kim, Tae Yeon Kim, Hyun Ah Kim, Sung Kwang Son, Hye Ryun Yoo, Jae Min Lee, Ki Yong Cheong
  • Microorganism producing O-acetyl homoserine and the method of producing O-acetyl homoserine using the same
    Patent number: 10815509
    Abstract: Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: October 27, 2020
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Hyun Ah Kim, Ju Hee Seo, Yong Uk Shin, So Young Kim, Sang Kyoum Kim, Kwang Ho Na, Jee Yeon Bae, Sung Kwang Son, Hye Ryun Yoo, Jin Geun Choi
  • NOVEL L-TRYPTOPHAN EXPORTER AND METHOD OF PRODUCING L-TRYPTOPHAN USING THE SAME
    Publication number: 20200063219
    Abstract: The present disclosure relates to a microorganism producing L-tryptophan in which the microorganism is modified such that a protein having an L-tryptophan-exporting activity comprising the amino acid sequence of SEQ ID NO: 1 is expressed, and a method for producing L-tryptophan using the microorganism.
    Type: Application
    Filed: February 22, 2019
    Publication date: February 27, 2020
    Inventors: Moo Young JUNG, Chang Il SEO, Hyo Jin KIM, Tae Yeon KIM, Hyun Ah KIM, Sung Kwang SON, Hye Ryun YOO, Jae Min LEE, Ki Yong CHEONG
  • MICROORGANISM PRODUCING O-ACETYL HOMOSERINE AND THE METHOD OF PRODUCING O-ACETYL HOMOSERINE USING THE SAME
    Publication number: 20200024626
    Abstract: Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 23, 2020
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Hyun Ah KIM, Ju Hee SEO, Yong Uk SHIN, So Young KIM, Sang Kyoum KIM, Kwang Ho NA, Jee Yeon BAE, Sung Kwang SON, Hye Ryun YOO, Jin Geun CHOI
  • Microorganism producing O-acetyl-homoserine and method for producing O-acetylhomoserine using the same
    Patent number: 10501763
    Abstract: The present disclosure relates to a microorganism producing O-acetylhomoserine with high efficiency and a method for producing O-acetylhomoserine and L-methionine using the microorganism. The present disclosure provides a microorganism producing O-acetylhomoserine having an enhanced activity of a protein which is predicted to export O-acetylhomoserine, and a method for producing O-acetylhomoserine and L-methionine using the microorganism.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: December 10, 2019
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Jee Yeon Bae, Hyun Ah Kim, Yong Uk Shin, So Young Kim, Sang Kyoum Kim, Kwang Ho Na, Ju Hee Seo, Sung Kwang Son, Hye Ryun Yoo, Jin Geun Choi
  • Microorganism producing O-acetyl homoserine and the method of producing O-acetyl homoserine using the same
    Patent number: 10465217
    Abstract: Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: November 5, 2019
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Hyun Ah Kim, Ju Hee Seo, Yong Uk Shin, So Young Kim, Sang Kyoum Kim, Kwang Ho Na, Jee Yeon Bae, Sung Kwang Son, Hye Ryun Yoo, Jin Geun Choi
  • O-acetylhomoserine sulfhydrylase variant and method for producing L-methionine using same
    Patent number: 10378031
    Abstract: The present disclosure relates to a novel O-acetylhomoserine sulfhydrylase variant, a polynucleotide encoding the same, a vector comprising the polynucleotide, a strain capable of expressing the variant, and a method for producing L-methionine using the variant.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: August 13, 2019
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Imsang Lee, Sung Kwang Son, Hyeryun Yoo, Jae Hee Lee, Joo Hee Lee, Jin Sook Chang, Jin-Geun Choi, So Young Kim, Yong Uk Shin
  • O-ACETYLHOMOSERINE SULFHYDRYLASE VARIANT AND METHOD FOR PRODUCING L-METHIONINE USING SAME
    Publication number: 20180355389
    Abstract: The present disclosure relates to a novel O-acetylhomoserine sulfhydrylase variant, a polynucleotide encoding the same, a vector comprising the polynucleotide, a strain capable of expressing the variant, and a method for producing L-methionine using the variant.
    Type: Application
    Filed: October 13, 2016
    Publication date: December 13, 2018
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Imsang Lee, Sung Kwang Son, Hyeryun Yoo, Jae Hee Lee, Joo Hee Lee, Jin Sook Chang, Jin-Geun Choi, So Young Kim, Yong Uk Shin
  • Composition for Feed Additive, and Animal Feed Composition Containing Same
    Publication number: 20180042267
    Abstract: The present invention relates to a feed additive composition having a high content of L-methionine, and an animal feed composition comprising the feed additive composition. More specifically, the present invention relates to a feed additive composition comprising 60 to 99.9 wt % of L-methionine together with L-phenylalanine and L-tyrosine, and to an animal feed composition comprising the feed additive composition.
    Type: Application
    Filed: March 15, 2016
    Publication date: February 15, 2018
    Inventors: In Kyung HEO, Sung Kwang SON, Jin Geun CHOI, So Young KIM, Yong Uk SHIN, Jae Hee LEE, Jin Woo SUNG, Youn Jae LEE, Jin Seong RIM, Jun Young JUNG
  • MICROORGANISM PRODUCING O-ACETYL-HOMOSERINE AND METHOD FOR PRODUCING O-ACETYLHOMOSERINE USING THE SAME
    Publication number: 20170137853
    Abstract: The present disclosure relates to a microorganism producing O-acetylhomoserine with high efficiency and a method for producing O-acetylhomoserine and L-methionine using the microorganism. The present disclosure provides a microorganism producing O-acetylhomoserine having an enhanced activity of a protein which is predicted to export O-acetylhomoserine, and a method for producing O-acetylhomoserine and L-methionine using the microorganism.
    Type: Application
    Filed: June 5, 2015
    Publication date: May 18, 2017
    Inventors: Jee Yeon BAE, Hyun Ah KIM, Yong Uk SHIN, So Young KIM, Sang Kyoum KIM, Kwang Ho NA, Ju Hee SEO, Sung Kwang SON, Hye Ryun YOO, Jin Geun CHOI
  • MICROORGANISM PRODUCING O-ACETYL HOMOSERINE AND THE METHOD OF PRODUCING O-ACETYL HOMOSERINE USING THE SAME
    Publication number: 20170101655
    Abstract: Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.
    Type: Application
    Filed: June 22, 2015
    Publication date: April 13, 2017
    Inventors: Hyun Ah KIM, Ju Hee SEO, Yong Uk SHIN, So Young KIM, Sang Kyoum KIM, Kwang Ho NA, Jee Yeon BAE, Sung Kwang SON, Hye Ryun YOO, Jin Geun CHOI
  • Method for Increasing the Solubility of Methionine by Mineral Addition and Acid Treatment
    Publication number: 20170016037
    Abstract: The present invention relates to a method for enhancing the solubility of methionine. More particularly, the present invention relates to a method for increasing the solubility of methionine, in which mineral and sulfuric acid are added at an appropriate ratio to enhance the methionine solubility, thereby overcoming the problem of low solubility of methionine in water.
    Type: Application
    Filed: September 30, 2016
    Publication date: January 19, 2017
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Hyun Ah Kim, Ju Eun Kim, Chang Il Seo, Sung Kwang Son, Sang Mok Lee, Sung Hoo Jhon, Han Jin Lee, Kwang Ho Na, Il Chul Kim
  • Recombinant microorganism producing quinolinic acid and a method for producing quinolinic acid using the same
    Patent number: 9534240
    Abstract: The present invention relates to a quinolinic acid-producing recombinant microorganism expressing a fusion protein of L-aspartate oxidase and quinolinate synthase linked via a linker, and a method for producing quinolinic acid using the same.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: January 3, 2017
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Yong Uk Shin, So Young Kim, In Kyung Heo, Ju Eun Kim, Sung Kwang Son, Jae Hee Lee, Ji Hyun Lee, Chang Gyeom Kim
  • Preparation of process of L-methionine
    Patent number: 9365877
    Abstract: The present invention relates to a method for producing L-methionine using a bio-synthesis process and a specific enzymatic process. More particularly, the present invention relates to a method for producing L-methionine with high yield by enzyme conversion reaction from L-methionine precursor in the presence of methyl mercaptan (CH3SH). The process of the present invention enables selective production of L-methionine which may be used in various fields of industry, such as feed- and food-additives, as raw material for medical supplies, pharmaceutical drugs, and the like.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: June 14, 2016
    Assignees: CJ CHEILJEDANG CORPORATION, ARKEMA FRANCE
    Inventors: Georges Fremy, Patrice Barre, So Young Kim, Sung Kwang Son, Sang Mok Lee
  • Method for the preparation of nicotinic acid
    Patent number: 9297030
    Abstract: A method for the preparation of nicotinic acid, which includes the step of obtaining a culture solution containing quinolinic acid by incubating a microorganism having an ability to produce quinolinic acid, and the step of adding an acid to the culture solution and conducting a decarboxylation reaction.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: March 29, 2016
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Ju Eun Kim, Sung Kwang Son, Chang Il Seo, Hyun Ah Kim, Han Jin Lee, Kwang Ho Na, Jee Yeon Bae
  • L-aspartate oxidase variant and a method for producing quinolinate or nicotinic acid using the same
    Patent number: 9290743
    Abstract: To produce quinolinate effectively, a L-aspartate oxidase variant that the feedback regulation by nicotinic acid or NAD is released, and a microorganism including the L-aspartate oxidase variant are provided. Quinolinate may be effectively produced by culturing of the microorganism including the L-aspartate oxidase variant.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: March 22, 2016
    Assignee: CJ CHEILJEDANG CORP.
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Ju Eun Kim, Kwang Ho Na, Chang Il Seo, Sung Kwang Son, Jae Hee Lee
  • Modified polypeptide having homoserine acetyltransferase activity and microorganism expressing the same
    Patent number: 9127257
    Abstract: The present invention relates to a polypeptide that is modified to have homoserine O-acetyltransferase activity, and in particular, the present invention provides a modified polypeptide having homoserine O-acetyltransferase activity, in which the amino acid at position 111 of a polypeptide having homoserine succinyltransferase activity is substituted with other amino acid.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: September 8, 2015
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, Chang Il Seo, In Kyung Heo, Ju Eun Kim, Hyun Ah Kim, Han Jin Lee, Kwang Ho Na, Sung Kwang Son