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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Magnetic Resonance Society
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Korean Magnetic Resonance Society
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Volume & Issues
Volume 1, Issue 2 - Dec 1997
Volume 1, Issue 1 - Jun 1997
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Conformational Study of Decamer DNA Duplex
by NMR Spectroscopy
Lee, Joon-Hwa ; Park, Jin-Young ; Han, Hi-Jung ; Park, Byong-Seok ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 63~70
The conformation of the self-complementary decamer duplex, d(ACGTATACGT)2 (TATA-duplex) has been studied by proton NMR spectroscopy. The duplex is essentially B-type, with distortions apparent at the TATA steps. These conformational distortion which may be preferable to occur in the thymine residue on the 5'-side, has been investigated by unusual NOE crosspeaks.
Parmeter Optimization for Calculation of Proton Chemical Shift in Protein
Park, Kyunglae ; Wil ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 71~78
The magnetic anisotropy effects of peptide group in structured protein on proton chemical shift have been investigated using trialanine modeling. The structure dependent part of chemical shift of C
H of the second amino acid residue was assumed to come purely from the magnetic anisotropy effects of C=O and C-N bonds of peptide in the direct neighborhood and thus to be dependent on and
angle of this dipeptide. A set of dipeptide models with different and
angles were generated and from these models the chemical shift values were calculated using known algorithm to emphasize the role of parameters used in the equation. Comparison of sets of different parameters resulted in an optimized parameters which could reproduce the statistical chemical shift values observed in proteins with respect ot the secondary conformation.
Solution Structure of Bovine Pancreatic Trypsin Inhibitor using NMR Chemical Shift Restraints
Park, Kyunglae ; Wil ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 79~94
The solution structure of bovine pancreatic trypsin inhibitor(BPTI) has been refined by NMR chemical shift data of C
H using classical molecular dynamics simulation. The structure dependent part of the observable chemical shift was modeled by ring current effect, magnetic anisotropy effect from the nearby groups, whereas the structure independent part was replaced with the random coil shift. A new harmonic function derived from the differences between the observed and calculated chemical shifts was added into physical force field as an pseudo potential energy term with force constant of 250 kJmol-1 ppm-2. During the 1.5 ns molecular dynamics simulation with chemical shift restraints BPTI has accessed different conformation space compared to crystal and NOE driven structure.
Deuterium NMR Studies of
Woo, Ae-Ja ; Maria I. Altbach ; Leslie G. Butler ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 95~102
Deuterium quadrupole coupling constant (e2qzzQ/h) of (
3-C2H)[Co(CO)3]3 was determined by using solid-state deuterium MAS NMR spectroscopy. The small quadrupole coupling constant of bridging methyne unit relative to sp-acethylene in propyne is discussed in terms of the C-H bond length and the negative charge on the carbon.
An Optimization of the 3D
TOCSY-HSQC and NOESY-HSQC Experiments Using Sensitivity Enhancement with Gradient Selection
Jeon, Young-Ho ; Kim, Kuk-Hyun ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 103~111
Proper pulse sequences and experimental optimization for the 3D 15N edited TOCSY and NOESY spectra were described. Using sensitivity enhancement approach with coherent selection by pulsed field gradients described by Kay and co-workers, an considerable gain in sensitivity was achieved. The sensitivity was also improved by minimal water saturation using water flip-back pulse. Among the three types of TOCSY mixing pulse, named MLEV-17, DIPSI-2rc, DIPSI-2rc sequence gave the most sensitive spectrum. These results suggest an appropriate pulse sequence for for those 3D experiments for large proteins.
Design of Novel Hemoglobins
Park, Jong-Whan ; Seunho Jung ; Kim, Hyun-Won ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 112~125
It has been demonstrated that mutant Hemoglobins (Hb) which have an altered
2 subunit interface can be designed. A compensatory mutation for a naturally occurring abnormal human Hb, Hb Kempsey (
99Asp\longrightarrowAsn), has been designed, and this mutation allowed the molecule to regain its allosteric response. The calculated values for the difference in the free energy of cooperativity show excellent agreement with experimentally determined thermodynamic values, suggesting that the molecular dynamics simulation results can be used to obtain information about the specific interactions which contribute to the total free energy of cooperativity. These results provide encouragement to begin a systematic investigation of the molecular basis of the subunit interactions between the
2 chains of Hb A by designing appropriate r Hbs. These studies could lead to the design of Hbs with desired cooperativity in the oxygenation process and to the restoration of functional properties of abnormal hemoglobins associated with hemoglobinopathies. Thus, the present results also have the implications in using gene therapy to treat patients with hemoglobinpathies.
Cupric Ion Species in Cu(II)-Exchanged Mesoporous MCM-41 Gallosilicate Determined by Electron Spin Resonance Studies
Kim, Jeong-Yeon ; Yu, Jong-Sung ;
Journal of the Korean Magnetic Resonance Society, volume 1, issue 2, 1997, Pages 126~140
Mesoporous MCM-41 gallosilicate material was synthesized through shifting through shifting gallosilicate polymer equilibrium towards a MCM-41 phase by addition of acid. The location of Cu(II) exchanged into MCM-41 and its interaction with various adsorbate molecules were investigated by electron spin responance and electron spin echo modulation spectroscopies. It was found that in the fresh hydrated material, Cu(II) is octahedrally coordinated to six water molecules. This species is located in a cylindrical channel and rotates rapidly at room temperature. Evacuation at room temperature removes three of these water molecules, leaving the Cu (II) coordinated to three water molecules and anchored to oxygens in the channel wall. Dehydration at 45
produces one Cu (II) species located in the inner surface of a channel as evidenced by broadening of its ESR lines by oxygen. Adsorption of polar molecules such as water, methanol and ammonia on dehydrated CuNa-MCM-41 gallosilicate material causes changes in the ESR spectrum of Cu (II), indicating the complex formation with these adsorbates. Cu (II) forms a complex with six molecules of methanol as evidenced by an isotropic room temperature ESR signal and ESEM data like upon water adsorption. Cu(II) also forms a complex containing four molecules of ammonia based on resolved nitrogen superhyperfine interaction.