Related ArticlesPressure-denatured state of Escherichia coli ribonuclease HI as monitored by Fourier transform infrared and NMR spectroscopy.
Biochemistry. 1998 Dec 22;37(51):18001-9
Authors: Yamasaki K, Taniguchi Y, Takeda N, Nakano K, Yamasaki T, Kanaya S, Oobatake M
Pressure denaturation of Escherichia coli ribonuclease HI (RNase HI) was studied by Fourier transform infrared (FTIR) and two-dimensional NMR spectroscopy at pD* 3.0 and 25 degrees C. A reversible transition in the pressure range of 0.1-1090 MPa was observed with second-derivative FTIR experiments. A cooperative and gradual denaturation, involving both the secondary and tertiary structures, was observed between 240 and 450 MPa. The two peaks at 1629 and 1652 cm(-1), due to beta-strands and alpha-helices, respectively, did not fully disappear after the denaturation, and are different from the spectra of the random coil peptides. The hydrogen-deuterium exchange rates of the individual backbone amide protons were determined by heteronuclear NMR combined with the pressure-jump technique at 500, 650, and 850 MPa. Although most of the amides protected in the native structure are also highly protected in the pressure-denatured state, the rate constants (0.048 +/- 0.007 min(-1)) for the amide protons at 500 MPa are similar regardless of their locations, which is an indication of the EX1 mechanism of hydrogen-deuterium exchange. The pressure-denatured state of RNase HI at 500 MPa represents a novel denatured state, which is different from a typical molten globule state at atmospheric pressure (0.1 MPa), from the viewpoint of the homogeneous rate constants. The observations at 650 MPa are essentially the same as those at 500 MPa. However, at 850 MPa, the amide exchange rates for the highly hydrophobic C-terminal half of alpha-helix I are significantly slower than those for the other part of the protein, which can be interpreted as a hydrophobic collapse centered at the C-terminal half of alpha-helix I.
[NMR paper] Ribonuclease Sa conformational stability studied by NMR-monitored hydrogen exchange.
Ribonuclease Sa conformational stability studied by NMR-monitored hydrogen exchange.
Related Articles Ribonuclease Sa conformational stability studied by NMR-monitored hydrogen exchange.
Biochemistry. 2005 May 31;44(21):7644-55
Authors: Laurents DV, Scholtz JM, Rico M, Pace CN, Bruix M
The conformational stability of ribonuclease Sa (RNase Sa) has been measured at the per-residue level by NMR-monitored hydrogen exchange at pH* 5.5 and 30 degrees C. In these conditions, the exchange mechanism was found to be EXII. The conformational stability...
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[NMR paper] Acid-induced denaturation of Escherichia coli ribonuclease HI analyzed by CD and NMR
Acid-induced denaturation of Escherichia coli ribonuclease HI analyzed by CD and NMR spectroscopies.
Related Articles Acid-induced denaturation of Escherichia coli ribonuclease HI analyzed by CD and NMR spectroscopies.
Biopolymers. 2003 Jun;69(2):176-88
Authors: Yamasaki K, Yamasaki T, Kanaya S, Oobatake M
Acid-induced denaturation of the ribonuclease HI protein from Escherichia coli was analyzed by CD and NMR spectroscopies. The CD measurement revealed that the acid denaturation at 10 degrees C proceeds from the native state (N-state) to a...
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[NMR paper] High pressure NMR reveals active-site hinge motion of folate-bound Escherichia coli d
High pressure NMR reveals active-site hinge motion of folate-bound Escherichia coli dihydrofolate reductase.
Related Articles High pressure NMR reveals active-site hinge motion of folate-bound Escherichia coli dihydrofolate reductase.
Biochemistry. 2000 Oct 24;39(42):12789-95
Authors: Kitahara R, Sareth S, Yamada H, Ohmae E, Gekko K, Akasaka K
A high-pressure (15)N/(1)H two-dimensional NMR study has been carried out on folate-bound dihydrofolate reductase (DHFR) from Escherichia coli in the pressure range between 30 and 2000 bar. Several...
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[NMR paper] NMR structure of ribonuclease HI from Escherichia coli.
NMR structure of ribonuclease HI from Escherichia coli.
Related Articles NMR structure of ribonuclease HI from Escherichia coli.
Biol Pharm Bull. 2000 Oct;23(10):1147-52
Authors: Fujiwara M, Kato T, Yamazaki T, Yamasaki K, Nagayam K
The solution structure of ribonuclease HI (RNase HI) from Escherichia coli (E. coli), a protein of 155 residues, was determined. Three-dimensional nuclear Overhauser enhancement spectroscopy (NOESY) was used to obtain 1,424 distance constraints between individually assigned polypeptide chain hydrogen atoms....
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[NMR paper] The pressure-temperature free energy-landscape of staphylococcal nuclease monitored b
The pressure-temperature free energy-landscape of staphylococcal nuclease monitored by (1)H NMR.
Related Articles The pressure-temperature free energy-landscape of staphylococcal nuclease monitored by (1)H NMR.
J Mol Biol. 2000 Apr 28;298(2):293-302
Authors: Lassalle MW, Yamada H, Akasaka K
The thermodynamic stability of staphylococcal nuclease was studied against the variation of both temperature and pressure by utilizing (1)H NMR spectroscopy at 750 MHz in 20 mM Mes buffer containing 99.9 % (2)H(2)O, pH 5.3. Equilibrium fractions of folded...
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[NMR paper] Folding pathway of Escherichia coli ribonuclease HI: a circular dichroism, fluorescen
Folding pathway of Escherichia coli ribonuclease HI: a circular dichroism, fluorescence, and NMR study.
Related Articles Folding pathway of Escherichia coli ribonuclease HI: a circular dichroism, fluorescence, and NMR study.
Biochemistry. 1995 Dec 26;34(51):16552-62
Authors: Yamasaki K, Ogasahara K, Yutani K, Oobatake M, Kanaya S
The unfolding and refolding processes of Escherichia coli ribonuclease HI at 25 degrees C, induced by concentration jumps of either guanidine hydrochloride (GuHCl) or urea, were investigated using stopped-flow...
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[NMR paper] NMR study of the cold, heat, and pressure unfolding of ribonuclease A.
NMR study of the cold, heat, and pressure unfolding of ribonuclease A.
Related Articles NMR study of the cold, heat, and pressure unfolding of ribonuclease A.
Biochemistry. 1995 Jul 11;34(27):8631-41
Authors: Zhang J, Peng X, Jonas A, Jonas J
The reversible cold, heat, and pressure unfolding of RNase A and RNase A--inhibitor complex were studied by 1D and 2D 1H NMR spectroscopy. The reversible pressure denaturation experiments in the pressure range from 1 bar to 5 kbar were carried out at pH 2.0 and 10 degrees C. The cold denaturation was...
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[NMR paper] Complete assignments of magnetic resonances of ribonuclease H from Escherichia coli b
Complete assignments of magnetic resonances of ribonuclease H from Escherichia coli by double- and triple-resonance 2D and 3D NMR spectroscopies.
Related Articles Complete assignments of magnetic resonances of ribonuclease H from Escherichia coli by double- and triple-resonance 2D and 3D NMR spectroscopies.
Biochemistry. 1993 Jun 1;32(21):5656-69
Authors: Yamazaki T, Yoshida M, Nagayama K
Assignments of 1H, 15N, and 13C magnetic resonances for ribonuclease H from Escherichia coli have been completed using double- and triple-resonance 2D and 3D...