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Journal of the Korean magnetic resonance society 8건

  1. [국내논문]   [ $^1H$ ] Nuclear Magnetic Resonance Study of Ferroelectric $(NH_4)_3H(SO_4)_2$  

    Choi, S.H. (Department of Physics, Konkuk University ) , Han, K.S. (Department of Physics, Konkuk University ) , Kwon, S.K. (Department of Physics, Konkuk University ) , Nam, S.K. (Department of Physics, Konkuk University ) , Choi, H.H. (Department of Physics, Konkuk University ) , Lee, Moo-Hee (Department of Physics, Konkuk University ) , Lim, Ae-Ran (Department of Science Education, Jeonju University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 64 - 72 , 2007 , 1226-6531 ,

    초록

    [ $^1H$ ] nuclear magnetic resonance (NMR) experiments have been performed at 30 - 300 K and 7 T to investigate dynamics of hydrogen bond network in the single crystal $(NH_4)_3H(SO_4)_2$ . The two proton sites, ammonium proton and hydrogen-bond proton, are identified from the $^1H$ NMR MAS spectrum at 340 K. As temperature decreases, the $^1H$ NMR spectrum shifts to the higher frequency side with a larger linewidth. The spectrum at 65 K shows a distinctive change in line shape toward the ferroelectric transition at 63 K. The measured values of $T_1$ for ammonium and hydrogen-bond protons are similar in the whole range of temperature. $T_1$ of $^1H$ NMR shows a gradual decrease down to 120 K and starts to steeply increase below 100 K. Then $T_1$ shows abrupt decrease below 70 K with a sharp minimum at 63 K, where the ferroelectric transition occurs. This temperature dependence of spectrum and $T_1$ clearly prove that the large change in the dynamics of hydrogen bond network is associated with the ferroelectric phase transition at 63 K.

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  2. [국내논문]   Purification and Backbone Assignment of the Hypothetical Protein MTH1821 from Methanobacterium Thermoautotrophicum H  

    Kwak, Soo-Young (Department of Biochemistry, HTSD-NMR National Research Laboratory, College of Science, Yonsei University ) , Lee, Woong-Hee (Department of Biochemistry, HTSD-NMR National Research Laboratory, College of Science, Yonsei University ) , Shin, Joon (Department of Biochemistry, HTSD-NMR National Research Laboratory, College of Science, Yonsei University ) , Ko, Sung-Geon (Department of Biochemistry, HTSD-NMR National Research Laboratory, College of Science, Yonsei University ) , Lee, Weon-Tae (Department of Biochemistry, HTSD-NMR National Research Laboratory, College of Science, Yonsei University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 73 - 84 , 2007 , 1226-6531 ,

    초록

    MTH1821 (UniProtKB/TrEMBL ID O27849) is a 96-residue hypothetical protein from the open reading frame of Methanobacterium thermoautotrophicum H one of the target organisms of structural genomics pilot project. Proteins which contain conserved sequence compared with MTH1821 have not been discovered yet and the functional and structural information for MTH1821 is not available. Here, we present the sequence-specific backbone resonance using multidimensional heteronuc1ear NMR spectroscopy and propose the secondary structure using GetSBY software. The backbone resonances of N, HN, $C_{\alpha}$ , $C_{\beta}$ , CO and $H_{\alpha}$ which are necessary for a prediction of secondary structure by GetSBY were assigned about 98% (557/568). The secondary structure of MTH1821 confirmed that it is comprised of four strand regions and two helical regions. This report will provide a valuable resource for the calculation solution structure of MTH1821 and for the other hypothetical protein that is targeted for structural-based functional discovery.

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  3. [국내논문]   Structural Study of the Cytosolic C-terminus of Vanilloid Receptor 1  

    Seo, Min-Duk (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University ) , Won, Hyung-Sik (Department of Biotechnology, Division of Life Sciences, College of Biomedical & Health Science, Konkuk University ) , Oh, Uh-Taek (Sensory Research Center, CRI, Seoul National University ) , Lee, Bong-Jin (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 85 - 94 , 2007 , 1226-6531 ,

    초록

    Vanilloid receptor I [transient receptor potential vanilloid subfamily member 1 (TRPV1), also known as VR1] is a non-selective cationic channel activated by noxious heat, vanilloids, and acid, thereby causing pain. VR1 possesses six transmembrane domain and N-and C-terminus cytosolic domains, and appears to be a homotetramer. We studied the structural properties of Cterminus of VR1 (VR1C) using CD and NMR spectroscopy. DPC micelles, with a zwitterionic surface, and SDS micelles, with a negatively charged surface, were used as a membrane mimetic model system. Both SDS and DPC micelles could increase the stability of helical structures and/or reduce the aggregation form of the VR1C. However, the structural changing mode of the VR1C induced by the SDS and DPC micelles was different. The changes according to the various pHs were also different in two micelles conditions. Because the net charges of the SDS and DPC micelles are negative and neutral, respectively, we anticipate that this difference might affect the structure of the VR1C by electrostatic interaction between the surface of the VR1C and phospholipids of the detergent micelles. Based on these similarity and dissimilarity of changing aspects of the VR1C, it is supposed that the VR1C probably has the real pI value near the pH 7. Generally, mild extracellular acidic pH ( $6.5{\sim}6.8$ ) potentiates VRI channel activation by noxious heat and vanilloids, whereas acidic conditions directly activate the channel. The channel activation of the VRI might be related to the structural change of VR1C caused by pH (electrostatic interactions), especially near the pH 7. By measuring the $^1-^{15}N$ TROSY spectra of the VR1C, we could get more resolved and dispersed spectra at the low pH and/or detergent micelles conditions. We will try to do further NMR experiments in low pH with micelles conditions in order to get more information about the structure of VR1C.

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  4. [국내논문]   V(IV) Species, Location and Adsorbate Interactions in VH-SAPO-42 Studied by ESR and Electron Spin-Echo Modulation Spectroscopies  

    Back, Gern-Ho (Department of Chemistry, Changwon National University ) , Yu, Jong-Sung (Department of Chemistry, BK21 NanoBio Sensor Research Team, Hannam University ) , Lee, Hye-Young (Department of Chemistry, Changwon National University ) , Kim, Min-Sik (Department of Chemistry, BK21 NanoBio Sensor Research Team, Hannam University ) , Lee, Yong-Ill (Department of Chemistry, Changwon National University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 95 - 109 , 2007 , 1226-6531 ,

    초록

    Vanadium-incorporated aluminophosphate microporous molecular sieve VH-SAPO-42 has been studied by electron spin resonance(ESR) and electron spin-echo modulation (ESEM) spectroscopies to determine the vanadium location and interaction with various adsorbate molecules. The results are interpreted in terms of V(IV) ion location and coordination geometry. Assynthesized VH-SAPO-42 contains only vanadyl species with distorted octahedral or trigonal bipyramidal coordination. Vanadium incorporated into H-SAPO-42 occupied extra-framework site. After calcinations in $O_2$ and exposure to moisture, only species A is observed with reduced intensities. Species A is identified as a $VO(H_2O)_2^{2+}$ complex coordinated to three framework oxygen atoms bonded to aluminum. When hydrated VH-SAPO-42 is dehydrated at elevated temperature by calcination, species A loses its water ligand and transforms to $VO^{2+}$ ions coordinated to three framework oxygens (species B). Species B reduces its intensities significantly after treatment with $O_2$ at high temperature, thus suggesting oxidation of $V^{4+}$ to $V^{5+}$ . When dehydrated VH-SAPO-42 makes contact with $D_2O$ at room temperature, the ESR signal of species A is regained. The species is assumed as a $VO(O_f)_3(D_2O)_2$ by considering three framework oxygens. Adsorption of deuterated methanol on dehydrated VH-SAPO-42 results in another new vanadium species D, which is identified as a $VO(CD_3OH)_2$ complex. When deuterated ethylene is adsorbed on dehydrated VH-SAPO-42, another new vanadium species E identified as a $VO(C_2D_4)^{2+}$ , is observed. Possible coordination geometries of these various complexes are discussed.

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  5. [국내논문]   Interactions of Membrane and PMAP-23 Studied by $^{31}P$ solid-state NMR Spectroscopy  

    Kim, Si-Won (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University ) , Kim, Suhk-Mann (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 110 - 114 , 2007 , 1226-6531 ,

    초록

    [ $^{31}P$ ] powder pattern spectra were measured to investigate the aspects of the interaction between the MLV (Multilamellar vesicle) and PMAP-23, a membrane of cathelicidin family and then CSAs(chemical shift anisotropy) were calculated to indentify the extent of perturbation of phospholipid mobility by the peptides. We found that acidic phospholipid interacts strongly with PMAP-23, and the analogues which modified to increase the amphipathic property showed that larger change of CSA. The analogue which introduced positive charge showed the same effects with amphipathic property.

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  6. [국내논문]   Quantitative Analysis of Chloride by Heteronuclear Electronic Reference NMR Method  

    Lee, Sueg-Geun (Center for Chemical Analysis, Korea Research Institute of Chemical Technology)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 115 - 121 , 2007 , 1226-6531 ,

    초록

    A new quantitative analysis of chloride by the HERETIC NMR method which does not need internal or external references was described. The results showed that the use of HERETIC peak corresponding $500\;{\mu}g/mL$ of chloride calibration showed less than 4 % standard deviations from 50 to $5000\;{\mu}g/mL$ range of chloride concentrations.

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  7. [국내논문]   Three Sterol Sulfates Isolated from a Marine Sponge Acanthodoryx Fibrosa   피인용횟수: 2

    Park, Su-Young (Department of Oceanography, Kunsan National University ) , Hwang, Byung-Su (Department of Oceanography, Kunsan National University ) , Ji, Kwang-Hee (Department of Oceanography, Kunsan National University ) , Rho, Jung-Rae (Department of Oceanography, Kunsan National University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 122 - 128 , 2007 , 1226-6531 ,

    초록

    Three sterol sulfates were isolated from AMPK activity-guided fraction of a marine sponge Acanthodoryx fibrosa. Their structures were determined by an extensive NMR analysis, MS data, and two compounds were confirmed as unusual phosphorylated sterol sulfates by comparing with NMR data of the known compounds. Compound 3 was given to be a new dephosphated sterol sulfate derivative. Compound 1 moderately showed AMPK activation effect on L6 myoblast cell through Western blot analysis.

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  8. [국내논문]   Interaction of ${\varepsilon}-L-{\beta}-lysine$ as a Tail Analogy of Tallysomycin-A to a Double Helical DNA Oligonucletide $d(CGCTTCGAAGCG)_{2}$, was investigated by NMR  

    Lee, Chang-Jun (Department of Chemistry and Applied Chemistry, College of Science and Technology, Hanyang University ) , Won, Ho-Shik (Department of Chemistry and Applied Chemistry, College of Science and Technology, Hanyang University)
    Journal of the Korean magnetic resonance society v.11 no.2 ,pp. 129 - 137 , 2007 , 1226-6531 ,

    초록

    During the screening of material which has the antimicrobial activity against aminoglycoside-resistant bacteria, A new material ${\varepsilon}-(L-{\beta}-lysine)$ polypeptide from a culture medium of Streptomyces sp.(DWGS2) was isolated, and the structure and the physicochemical properties of the new material were elucidated. The new material was separated by column chromatography of the culture medium using Dowex $1{\times}2$ , Silica gel, and Sephadex LH20 etc. The structure and molecular weight were determined with the data of NMR, MALDI mass, and ESI mass experiments. And the monomer obtained by hydrolysis of the new material with 6N-HCI was identified as a $L-{\beta}-lysine(T_2)$ , which is a tail of bleomycin. As tail-region analogy, $T_2({\beta}-lysine$ derivatives from streptomyces) interactions with a self-complementary oligonucleotides, $d(CGCTTCGAAGCG)_2$ , was investigated by NMR.

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