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Han, Oksoo,Kim, Choonkeun,Kim, Wonyoung The Korea Science and Technology Center 1999 BMB Reports Vol.32 No.1
In an effort to understand the function of the eryBVⅡ gene in the erythromycin biosynthetic gene cluster, we overexpressed the eryBVⅡ gene in E. coli and TDP-6-deoxy-L-threo-D-glycero-4 hexulose was used as a substrate of the overexpressed EryBVⅡ enzyme. The enzymatic reaction product was chemically modified by reduction and peracetylation. Structural analysis of the derivatized enzymatic products by GC-Mass Spectrophotometry indicated that TDP-6-deoxy-L-threo-D-glycero-4-hexulose could be converted into its epimer by EryBVⅡ enzyme. Based on this result, TDP-6-deoxy-threo-D-glycero-4-hexulose was indeed the substrate of EryBVⅡenzyme and the function of the eryBVⅡ gene was confirmed.
韓鈺洙 단국대학교 미소연구소 1991 미소연구 Vol.5 No.-
Since the musical art is one important arm of a cultural body, a comparison of two musical traditions should be preceded by a study on past cultural background. In this paper the development of music and its education in both USSR and USA is comparatively studied by analyzing the flow of music and musicians/teachers through good examples of individual history. Even though western music was introduced into Russia rather late, the combination of a high level of philosophical content, the poetic emotionalism, and deep understanding of the human soul of Russians brought the golden period of the romantic Russian school from later nineteenth to early twentieth century. Russian contemporary music and the art of musical performance, especially in piano and strings, continue to be the best. Since the october Revolution in 1917, however, the “Soviet realism” doctrine has isolated Soviet music from outside development to make it remain, in effect, romantically conservative. Soviet music has often been criticized to allow only prototyped musical interpretation though Soviet musicians enjoy the perfect technical skills. But it should be kept in mind that, since art is the only spiritual solace to the people in a totalitarian society, the traditional high esteem for art and pure musical soul must have been dynamically dormant in Russian minds to explode again when time comes. On the other hand, the ebbing of German music by the advent of modernism in France and the German defeat in World war Ⅰ, and the flooding migration of eminent musicians and teachers from the USSR to the USA after the Russian revolution combined to expedite America’s music development. The establishment of professional music schools modeled after Russian conservatories during this same period also lead the way for the USA to become the world music center since the Cold War and isolation of Soviet music. As the Cold War era is over now, a new golden opportunity of progress has come upon Russian music, an opportunity similar to that of a century ago. The quality of students entering , for example, the Moscow conservatory and the Juilliard School of Music is judged at the same level. So the remaining two key factors of future friendly competition between two musical traditions of the USSR and the USA will be training/education and performing activities. The strong economy of the USA will continuously cause the “Musician Drain” from Russia. However, music students will flock to Moscow for their training because Russia is still rich in the pure, natural neoromanticism, which is believed to direct the future development of music.
( Sereyvath Yoeun ),( Randeep Rakwal ),( Oksoo Han ) 생화학분자생물학회 2013 BMB Reports Vol.46 No.3
Phylogenetic and amino acid sequence analysis indicated that rice allene oxide synthase-1 (OsAOS1) is CYP74, and is clearly distinct from CYP74B, C and D subfamilies. Regio- and stereo-chemical analysis revealed the dual substrate specificity of OsAOS1 for (cis,trans)-configurational isomers of 13(S)- and 9(S)-hydroperoxyoctadecadienoic acid. GC-MS analysis showed that OsAOS1 converts 13(S)- and 9(S)-hydroperoxyoctadecadi( tri)enoic acid into their corresponding allene oxide. UV-Visible spectral analysis of native OsAOS1 revealed a Soret maximum at 393 nm, which shifted to 424 nm with several clean isobestic points upon binding of OsAOS1 to imidazole. The spectral shift induced by imidazole correlated with inhibition of OsAOS1 activity, implying that imidazole may coordinate to ferric heme iron, triggering a heme-iron transition from high spin state to low spin state. The implications and significance of a putative type II ligand-induced spin state transition in OsAOS1 are discussed.
장성국,조경원,Junko Shibato,Oksoo Han,Hitoshi Iwahashi,Shigeru Tamogami,Sajad Majeed Zargar,Akihiro Kubo,Yoshinori Masuo,Ganesh Kumar Agrawal,Randeep Rakwal 한국식물학회 2009 Journal of Plant Biology Vol.52 No.3
The 12-oxo-phytodienoic acid reductase (OPR) is a key enzyme in jasmonic acid (JA) biosynthesis. Previously, we reported the presence of 13 OPR isogenes (OsOPR1-13) in rice. OsOPRs phylogenetically belong to two subgroups, OPRI and OPRII. OsOPR13 is assigned to the second subgroup, which is involved in JA biosynthesis, while the others are found in the first subgroup. Here, we systematically investigated transcript levels of OsOPRs in various tissues and against diverse environmental stresses. Each gene was differentially involved in flower maturation, showing a tissue-specific response. OsOPR1, OsOPR2, and OsOPR13 were also active in responses to wounding, a fungal elicitor (chitosan), salt, UV-C irradiation, H2O2, and ozone exposure. In the case of JA-responsive OsOPRs (OsOPR1, OsOPR2, OsOPR6, OsOPR10, and OsOPR13), co-application of JA and SA suppressed jasmonate-induced transcript levels and delayed OsOPR10 expression. We also investigated the biochemical properties of OsOPR1 and found a flavin cofactor with optimal activity at pH7.8 and values of 0.048 min−1 kcat and 8.33 μM Km for (9S,13R)- 12-oxo-phytodienoic acid. Here, we discuss the role of OsOPRs in stress responses and floral development.
Yang Ju Im,Baik Ho Cho,Oksoo Han,Gap Chae Chung 한국분자세포생물학회 2002 Molecules and cells Vol.13 No.2
A wound-inducible Arabidopsis plastid ω-3 fatty acid desaturase (fad7) cDNA was obtained. Transgenic tobacco plants were produced by integration of the antisense fad7 DNA fragments under the control of a CaMV 35S promoter into the genome. Two transgenic T1 lines, AsFAD714 and 716, showed a strong expression of the antisense fad7 and reduced amounts of linolenic acid compared with the control plants. The two T1 lines were highly sensitive to dehydration conditions, showing growth retardation on the MS medium in the presence of 250 mM NaCl, and severe wilting under drought conditions. The expression of the transcriptional factor gene abf4 transducing ABAdependent signal in response to drought stress was strongly induced in the control plants, but far less in the AsFAD716 line. This suggests that the inhibitory effect of the antisense fad7 gene expression on the ABF-mediated stress-responsive gene regulation may reduce drought tolerance in the AsFAD716 line. However, no significant difference in the ABA concentration was found between the control and the AsFAD716 line under normal and drought conditions.
Kim, Joo Y.,Park, Su J.,Jang, Boseung,Jung, Che-Hun,Ahn, Sung J.,Goh, Chang-Hyo,Cho, Kyoungwon,Han, Oksoo,Kang, Hunseung Blackwell Publishing Ltd 2007 The Plant journal Vol.50 No.3
<P>Summary</P><P>Although glycine-rich RNA-binding protein 2 (GRP2) has been implicated in plant responses to environmental stresses, the function and importance of GRP2 in stress responses are largely unknown. Here, we examined the functional roles of GRP2 in <I>Arabidopsis thaliana</I> under high-salinity, cold or osmotic stress. GRP2 affects seed germination of Arabidopsis plants under salt stress, but does not influence seed germination and seedling growth of Arabidopsis plants under osmotic stress. GRP2 accelerates seed germination and seedling growth in Arabidopsis plants under cold stress, and contributes to enhancement of cold and freezing tolerance in Arabidopsis plants. No differences in germination between the wild-type and transgenic plants were observed following addition of abscisic acid (ABA) or glucose, implying that GRP2 affects germination through an ABA-independent pathway. GRP2 complements the cold sensitivity of an <I>Escherichia coli</I> BX04 mutant and exhibits transcription anti-termination activity, suggesting that it has an RNA chaperone activity during the cold adaptation process. Mitochondrial respiration and catalase and peroxidase activities were affected by expression of mitochondrial-localized GRP2 in Arabidopsis plants under cold stress. Proteome analysis revealed that expression of several mitochondrial-encoded genes was modulated by GRP2 under cold stress. These results provide new evidence indicating that GRP2 plays important roles in seed germination, seedling growth and freezing tolerance of Arabidopsis under stress conditions, and that GRP2 exerts its function by modulating the expression and activity of various classes of genes.</P>