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중국어 동사 전 목적명사구 및 수동형태소 명사구의 예외적 양태와 그 함축의미
송홍기(Sohng Hong-Ki) 한국생성문법학회 2005 생성문법연구 Vol.15 No.3
It is a well-known linguistic fact that in general, only a subject can serve as an antecedent and a blocker in the case of Chinese monomorphemic reflexivization. Contrary to our expectation, a DP that follows the passive morpheme bei or the preverbal object marker, which is a non-subject, serves as an antecedent for the Chinese reflexive, even though not serving as a blocker for a higher antecedent. Sohng (2004a) shows that the blocking effect for the Chinese monomorphemic reflexive is accounted for in terms of LF Spec-head agreement that assigns and checks the φ-features of ziji. Based on LF head movement of a monomorphemic reflexive and checking of a [Refl] feature in Agr, the analysis put forward in this paper shows clearly that the unexpected non-subject antecedence on ziji is well explained in the split-I phrase structure originating with Pollock(1989) in terms of the Conditions on Subject Orientation and LF Spec-head agreement. Thus, the non-subject antecedence on ziji that this paper deals with provides firm support to the analysis given in this paper.
Glycosylation of free sterol by whole-cell bioconversion in E. coli
Jae Kyung Sohng,Jae Kyung Sohng 한국당과학회 2011 한국당과학회 학술대회 Vol.2011 No.1
Steryl glucosides play important roles in many physiological and biochemical process in organism such as the heat shock, enhancement of immunological system, etc. The alignment of a putative sterol glucosides isolated from S. tropica CNB-440 has been shown 34%, 42% and 57% in homology with the corresponding ones from Arabidopis thaliana, Avena sativa and Salinispora arenicola CNS-205, respectively. Engineered E. coli host-high level production of the UDP-glucose was used for whole-cell bioconversion of free sterol (cholesterol and β-sistosterol) and the production of glycosylated product was only detected with β-sitosterol as substrate.
Gene Cloning and Analysis of Biosynthetic Gene of Spectinomycin
Sohng, Jae-Kyung,Oh, Tae-Jin,Liou, Kwang-Kyoung,Lee, Hei-Chan 선문대학교 첨단과학기술연구소 2001 첨단과학기술연구소 논문집 Vol.5 No.-
A biosynthetic gene cluster involved in the production of spectinomyein was cloned from Streptomyes spectabilis cosmid library with dTDP-glucose 4,6-dehydratase and amnino transferase gene probes. The DNA probes were obtained from S. speciabilis genome with primers based on consensus sequences of known enzymes using a polymerase chain reaction. One of the cloned cosmids, pSPM8, contained the homologue of the dTDP-glucose 4,6-dehydratase and amino transferase gene. The DNA sequence analysis reveals four open reading frames and one incomplete reading frame. The putative orf1 protein reveals 29% amino acid sequence homology of putative myo-inositol-2-dehydrogenase from Vibrio anguillamm. The orf2 is about 46% homologous to putative myo-inositol-1-monophosphotase of Mycobacterium leprae. The orf3 showed strong homology (67.4%) to putative export protein (spcT) from s. flavopersicus. The amino acid sequel deduced from orf4 showed a high similarity (70.8%) to a spectinomycin resistance gene (spcN) from S. flavopersicus. Expression of orf4 in E. coli BL21 showed the spectinomycin resistance.
Sohng, Jae Kyung,Yoo, Jin-cheol 朝鮮大學校 1997 藥學硏究誌 Vol.18 No.2
DNA fragments, homologous to the dTDP-Dgiucose 4,6-dehydratase gene, obtained from the genomic DNA of Streptomyces antibioticus Tu¨99,a producer of the unusual macrolide antibiotic chlorothricin, were cloned and aequenced. This dehydratase gene was designated as oxil. The coding region of the oxil gene is composed of 987 bp, and analysis of the DNA sequence data reveals sequences for the gene products of 329 amino acids(molecular weight of 36.037). The deduced amino acids are 59% identical to the StrE, dTDP-D-glucose 4,6-dehydratase from the Streptomycin pathway. The oxil's function was examined by expressing it in E. coil using the T7 RNA polymerase/promoter system(pRSET) to produce an active fusion protein including a his tag. This enzyme shows apecificity of substrate, specific only to dTDP-D-glucose.
Mechanism Study of dTDP-D-Glucose 4,6-Dehydratase: General Base in Active Site Domain
Sohng, Jae-Kyung,Noh, Hyung-Rae,Yoo, Jin-Cheol The Korea Science and Technology Center 1999 BMB Reports Vol.32 No.4
dTDP-D-glucose 4,6-dehydratase as an oxidoreductase catalyzes the conversion of dTDP-D-glucose to dTDP-4-keto-6-deoxy-D-glucose, which is essential for the formation of 6-deoxysugars. dTDP-D-glucose 4,6-dehydratase shows remarkable stereochemical convergence in which displacement of the C-6 hydroxyl group by a C-4 hydrogen proceeds intramolecularly with inversion of configuration. The reaction mechanism is known to be oxidation, dehydration, and reduction by bases mediating proton transfer and NAD? cofactor. In this study, the bases in the active site domain are proposed to be His-79 and His-300 from a comparison of the peptides of the dehydratase and UDP-D-glucose epimerase. His-79 and His-300 were mutated to prepare the mutants H79L (mutation of histidine to leucine at the 79th amino acid) and H300A (mutation of histidine to alanine at the 300th amino acid) by site-directed mutagenesis. The H79L protein was inactive, showing that His-79 participates in the reaction mechanism.