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Your search keyword '"Byung-Ha Oh"' showing total 9 results
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9 results on '"Byung-Ha Oh"'

1. Preparation and characterization of alpha-D-glucopyranosyl-alpha-acarviosinyl-D-glucopyranose, a novel inhibitor specific for maltose-producing amylase

Author

Myo-Jeong Kim, Hee-Seob Lee, Jin-Sook Cho, Tae-Jip Kim, Tae-Wha Moon, Sang-Taek Oh, Jung-Wan Kim, Byung-Ha Oh, and Kwan-Hwa Park

Subjects
Biochemistry -- Research, Glucose -- Physiological aspects, Chemical inhibitors -- Physiological aspects, Amylases -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the maltose-producing amylase inhibitor. The preparation of this inhibitor carried out via the high-molecular-weight acarbose degradation is described.

Published
2002

2. Maintenance of alpha-helical structures by phenyl rings in the active-site tyrosine triad contributes to catalysis and stability of ketosteroid isomerase from Pseudomonas putida biotype

Author

Gyu Hyun Nam, Do Soo Jang, Sun-Shin Cha, Tae-Hee Lee, Do-Hyung Kim, Bee Hak Hong, Young Sung Yun, Byung-Ha Oh, and Kwan Yong Choi

Subjects
Biochemistry -- Research, Tyrosine -- Physiological aspects, Pseudomonas putida -- Physiological aspects, Steroid hormones -- Physiological aspects, Isomerases -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the ketosteroid isomerase from Pseudomonas putida biotype B. The structural and functional roles of the tyrosine residues' phenyl rings in the active site of P. putida ketosteroid isomerase have been investigated and discussed.

Published
2001

3. Calcium-dependent catalytic activity of a novel phytase from Bacillus amyloliquifaciens DS11

Author

Byung-Chul Oh, Chang, Byeong S., Kwan-Hwa Park, Nam-Chul Ha, Hyung-Kwoun Kim, Byung-Ha Oh, and Tae-Kwang Oh

Subjects
Biochemistry -- Research, Bacteria -- Physiological aspects, Calcium -- Physiological aspects, Phosphates -- Physiological aspects, Enzymes -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the thermostable phytase from Bacillus amyloliquifaciens DS11. The Ca (super)2+ -dependent catalytic properties of the phytase and its specific substrate requirement have been investigated.

Published
2001

4. Pseudoreversion of the catalytic activity of Y 14F by the additional substitution(s) of tyrosine with phenylalanine in the hydrogen bond network of delta (super)5 -3-ketosteroid isomerase from Pseudomonas putida biotype

Author

Gildon Choi, Nam-Chul Ha, Min-Sung Kim, Bee-Hak Hong, Byung-Ha Oh, and Kwan Yong Choi

Subjects
Biochemistry -- Research, Tyrosine -- Research, Phenylalanine -- Research, Hydrogen -- Research, Isomerases -- Research, Pseudomonas -- Research, Biological sciences, Chemistry
Abstract

Research has been conducted on the delta (super)5 -3-ketosteroid isomerase (KSI) from Pseudomonas putida biotype B. The crystal structures of Y 14F and the structural basis for the pseudoreversion in the KSI have been investigated.

Published
2001

5. An anti-apoptotic protein human survivin is a direct inhibitor of caspase-3 and-7

Author

Sejeong Shin, Byung-Je Sung, Yong-Soon Cho, Hyun-Ju Kim, Nam-Chul Ha, Jong-Ik Hwang, Chul-Woong Chung, Yong-Keun Jung, and Byung-Ha Oh

Subjects
Cell death -- Physiological aspects, Proteases -- Physiological aspects, Binding sites (Biochemistry) -- Analysis, Protein binding -- Physiological aspects, Biological sciences, Chemistry
Abstract

Results demonstrate that survivin mediates its anti-apoototic activity by sequestering caspase-3 and -7 in their inhibited states. Data indicate that the protein binds to caspase-3 and -7 and inhibits the cleavage of the physiological substrates of the enzymes during the G2/M phase of the cell cycle.

Published
2001

6. Role of catalytic residues in enzymatic mechanisms of homologous ketosteroid isomerases

Author

Kyung Seok Oh, Sun-Shin Cha, Do-Hyung Kim, Hyun-Soo Cho, Nam-Chul Ha, Gildon Choi, Jin Yong Lee, P. Tarakeshwar, Hyeon S Son, Kwan Yong Choi, Byung-Ha Oh, and Kwang S. Kim

Subjects
Enzyme kinetics -- Analysis, Catalysis -- Physiological aspects, Amino acids -- Physiological aspects, Hydrogen bonding -- Influence, Biological sciences, Chemistry
Abstract

Results reveal that catalysis of allylic isomerization by ketosteroid isomerase involves, among others, the catalytic residues charging the buffer to stabilize the negative charge of the intermediates. Data indicate that the hydrogen bond distance of the intermediate analogues is about 0.2 angstrom shorter in the product analogues.

Published
2000

7. Role of the glutamate 332 residue in the transglycosylation activity of Thermus maltogenic amylase

Author

Tae-Jip Kim, Cheon-Seok Park, Hee-Yeon Cho, Sun-Shin Cha, Jeong-Sun Kim, Soo-Bok Lee, Tae-Wha Moon, Jung-Wan Kim, Byung-Ha Oh, and Kwan-Hwa Park

Subjects
Biochemistry -- Research, Glutamate -- Research, Amylases -- Research, Mutagenesis -- Analysis, Hydrolysis -- Analysis, Biological sciences, Chemistry
Abstract

Research has been conducted on glutamate 332. The role of Glu332 in the hydrolysis and transglycosylation activity of Thermus maltogenic amylases has been investigated via site-directed mutagenesis.

Published
2000

8. Contribution of the hydrogen-bond network involving a tyrosine triad in the active site to the structure and function of a highly proficient ketosteroid isomerase from Pseudomonas putida biotype

Author

Do-Hyung Kim, Do Soo Jang, Gyu Hyun Nam, Gildon Choi, Jeong-Sun Kim, Nam-Chul Ha, Min-Sung Kim, Byung-Ha Oh, and Kwan Yong Choi

Subjects
Biochemistry -- Research, Hydrogen -- Research, Tyrosine -- Research, Isomerases -- Research, Pseudomonas putida -- Research, Biological sciences, Chemistry
Abstract

Research has been conducted on the Pseudomonas putida biotype B ketosteroid isomerase. The catalysis of the allylic isomerisation reaction is discussed.

Published
2000

9. Asp-99 donates a hydrogen bond not to tyr-14 but to the steroid directly in the catalytic mechanism of delta(sup)5-3-ketosteroid isomerase from Pseudomonas putida biotype

Author

Gildon Choi, Nam-Chul Ha, Suhng Wook Kim, Do-Hyung Kim, Songhee Park, Byung-Ha Oh, and Kwan yong Choi

Subjects
Aspartate -- Physiological aspects, Steroids (Drugs) -- Research, Isomerases -- Research, Pseudomonas putida -- Usage, Biological sciences, Chemistry
Abstract

Results indicate that amino acid aspartate 99 donates a hydrogen bond to the steroid intermediate directly in the catalytic reaction of isomerase from Pseudomonas putida Biotype B.

Published
2000

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