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Functional characterization of novS and novU involved in novobiocin producer S. spheroids
Thuy, Ta Thi Thu,Kharel, Madan Kumar,Heide, Luitz,Kim, Chun Gyu,Lee, Hei Chan,Liou, Kwang Kyoung,Sohng, Jaekyung 한국공업화학회 2004 응용화학 Vol.8 No.2
NovU and novS represent C-methyltransferase and dTDP-4-keto-reductase putatively involved in noviose biosynthetic pathway. We have expressed these genes in E. coli and identified the functions of their corresponding products by in vitro enzyme assay. The results indicated that novU encodes a C-methyltransferase and catalyzes the methylation of the NovW product (dTDP-glucose 3,5-epimerase). Similarly, NovS encodes a dTDP-4-ketoreductase and catalyzes the formation of rhamnose utilizing dTDP-4-keto-6-deoxyglucose in the presence of NADH and NovW. Furthermore, the pathway for the biosynthesis of noviose has been confirmed.
Thuy Duong Nguyen,To Thi Xuan Hang,Thu Thuy Pham,Anh Son Nguyen,Thu Thuy Thai,Gia Vu Pham,Ngoc Bach Ta 한국부식방식학회 2022 Corrosion Science and Technology Vol.21 No.6
Corrosion inhibitors based on Zn-Al hydrotalcites containing benzoate (ZnAlHB) with different molar ratios of Zn/Al were prepared with a co-precipitation process. Compositions and structures of the resulting hydrotalcites were studied with suitable spectroscopic methods such as inductively coupled plasma mass spectrometry (ICP-MS), ultraviolet-visible spectrophotometry (UV-Vis), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and surface zeta potential measurements, respectively. Results of physico-chemical studies showed that crystallite sizes, compositions of products, and surface electrical properties were significantly changed when the molar ratio of Zn/Al was increased. The release of benzoate from hydrotalcites also differed slightly among samples. Anticorrosion abilities of hydrotalcites intercalated with benzoate at a concentration of 3 g/L on carbon steel were analyzed using electrochemical impedance spectroscopy (EIS), polarization curve, energy-dispersive X-ray spectroscopy (EDX), and SEM. Corrosion inhibition abilities of benzoate modified hydrotalcites in 0.1 M NaCl showed an upward trend with increasing Zn/Al ratio. The reason for the dependence of corrosion resistance on the Zn/Al ratio was discussed, including changes in the microstructure of hydrotalcites such as crystal size, density, uniformity, and formation of ZnO.
Nguyen, Cuong Huu,Nhan, Thuy Thi,Ta, Hien Thu Thi 서울대학교 교육연구소 2021 Asia Pacific Education Review Vol.22 No.2
This study examines joint-degree training in a higher education context in Vietnam, especially its different operation and quality management aspects. First, it reviews program mobility in international practices, from which it identifies critical requirements for maintaining quality and sustainable transnational partnerships. It then discusses the rationales, government policies, recent developments, and key issues related to joint-degree training operations in Vietnam. Using data collected from administrators, teaching staff, and students of selected Vietnamese universities who are involved in delivering collaborative programs, this study further explains management, teaching, learning, and quality assurance aspects and provides implications for local institutions, academics, and students engaged in cross-border partnerships.
Characterization of a Chalcosyltransferase (gerGTII) in Dihydrochalcomycin Biosynthesis
Binod Babu Pageni,오태진,Ta Thi Thu Thuy,송재경 한국분자세포생물학회 2008 Molecules and cells Vol.26 No.3
An open reading frame, designated GerGTII and located downstream of the polyketide synthase genes, has been identified as a chalcosyltransferase by sequence analysis in the dihydrochalcomycin biosynthetic gene cluster of Streptomyces sp. KCTC 0041BP. The deduced product of gerGTII is similar to several glycosyltransferases, authentic and putative, and it displays a consensus sequence motif that appears to be characteristic of a sub-group of these enzymes. Specific disruption of gerGTII within the S. sp. KCTC 0041BP genome by insertional in-frame deletion method, resulted complete abolishment of dihydrochalcomycin and got the 20-O-mycinosyl-dihydrochalconolide as intermediate product in dihydrochalcomycin biosynthesis which was confirmed by electron spray ionization-mass spectrometry and liquid chromatography-mass spectrometry. Dihydrochalcomycin also was recovered after complementation of gerGTII.
Characterization of a Chalcosyltransferase (gerGTII) in Dihydrochalcomycin Biosynthesis
Pageni, Binod Babu,Oh, Tae-Jin,Thuy, Ta Thi Thu,Sohng, Jae Kyung Korean Society for Molecular Biology 2008 Molecules and cells Vol.26 No.3
An open reading frame, designated GerGTII and located downstream of the polyketide synthase genes, has been identified as a chalcosyltransferase by sequence analysis in the dihydrochalcomycin biosynthetic gene cluster of Streptomyces sp. KCTC 0041BP. The deduced product of gerGTII is similar to several glycosyltransferases, authentic and putative, and it displays a consensus sequence motif that appears to be characteristic of a sub-group of these enzymes. Specific disruption of gerGTII within the S. sp. KCTC 0041BP genome by insertional in-frame deletion method, resulted complete abolishment of dihydrochalcomycin and got the 20-O-mycinosyl-dihydrochalconolide as intermediate product in dihydrochalcomycin biosynthesis which was confirmed by electron spray ionization-mass spectrometry and liquid chromatography-mass spectrometry. Dihydrochalcomycin also was recovered after complementation of gerGTII.