1
|
Ohgi H, Imamura H, Sumi T, Nishikawa K, Koga Y, Westh P, Morita T. Two different regimes in alcohol-induced coil-helix transition: effects of 2,2,2-trifluoroethanol on proteins being either independent of or enhanced by solvent structural fluctuations. Phys Chem Chem Phys 2021; 23:5760-5772. [PMID: 33481971 DOI: 10.1039/d0cp05103a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Inhomogeneous distribution of constituent molecules in a mixed solvent has been known to give remarkable effects on the solute, e.g., conformational changes of biomolecules in an alcohol-water mixture. We investigated the general effects of 2,2,2-trifluoroethanol (TFE) on proteins/peptides in a mixture of water and TFE using melittin as a model protein. Fluctuations and Kirkwood-Buff integrals (KBIs) in the TFE-H2O mixture, quantitative descriptions of inhomogeneity, were determined by small-angle X-ray scattering investigation and compared with those in the aqueous solutions of other alcohols. The concentration fluctuation for the mixtures ranks as methanol < ethanol ≪ TFE < tert-butanol < 1-propanol, indicating that the inhomogeneity of molecular distribution in the TFE-H2O mixture is unexpectedly comparable to those in the series of mono-ols. On the basis of the concentration dependence of KBIs between the TFE molecules, it was found that a strong attraction between the TFE molecules is not necessarily important to induce helix conformation, which is inconsistent with the previously proposed mechanism. To address this issue, by combining the KBIs and the helix contents reported by the experimental spectroscopic studies, we quantitatively evaluated the change in the preferential binding parameter of TFE to melittin attributed to the coil-helix transition. As a result, we found two different regimes on TFE-induced helix formation. In the dilute concentration region of TFE below ∼2 M, where the TFE molecules are not aggregated among themselves, the excess preferential binding of TFE to the helix occurs due to the direct interaction between them, namely independent of the solvent fluctuation. In the higher concentration region above ∼2 M, in addition to the former effect, the excess preferential binding is significantly enhanced by the solvent fluctuation. This scheme should be held as general cosolvent effects of TFE on proteins/peptides.
Collapse
Affiliation(s)
- Hiroyo Ohgi
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.
| | - Hiroshi Imamura
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Tomonari Sumi
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan.
| | - Keiko Nishikawa
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba 263-8522, Japan. and Toyota Physical & Chemical Research Institute, Nagakute, Aichi 480-1192, Japan
| | - Yoshikata Koga
- Department of Chemistry, The University of British Columbia, Vancouver, V6T 1Z1, Canada
| | - Peter Westh
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, 2800, Kgs, Lyngby, Denmark
| | - Takeshi Morita
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.
| |
Collapse
|
2
|
Owen MC, Strodel B, Csizmadia IG, Viskolcz B. Radical Formation Initiates Solvent-Dependent Unfolding and β-sheet Formation in a Model Helical Peptide. J Phys Chem B 2016; 120:4878-89. [PMID: 27169334 DOI: 10.1021/acs.jpcb.6b00174] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We examined the effects of Cα-centered radical formation on the stability of a model helical peptide, N-Ac-KK(AL)10KK-NH2. Three, 100 ns molecular dynamics simulations using the OPLS-AA force field were carried out on each α-helical peptide in six distinct binary TIP4P water/2,2,2-trifluoroethanol (TFE) mixtures. The α-helicity was at a maximum in 20% TFE, which was inversely proportional to the number of H-bonds between water molecules and the peptide backbone. The radial distribution of TFE around the peptide backbone was highest in 20% TFE, which enhanced helix stability. The Cα-centered radical initiated the formation of a turn within 5 ns, which was a smaller kink at high TFE concentrations, and a loop at lower TFE concentrations. The highest helicity of the peptide radical was measured in 100% TFE. The formation of hydrogen bonds between the peptide backbone and water destabilized the helix, whereas the clustering of TFE molecules around the radical center stabilized the helix. Following radical termination, the once helical structure converted to a β-sheet rich state in 100% water only, and this transition did not occur in the nonradical control peptide. This study gives evidence on how the formation of peptide radicals can initiate α-helical to β-sheet transitions under oxidative stress conditions.
Collapse
Affiliation(s)
- Michael C Owen
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich , 52425 Jülich, Germany
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich , 52425 Jülich, Germany.,Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf , Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Imre G Csizmadia
- Department of Chemistry, University of Toronto , Toronto, ON Canada M5S 3H6.,Institute of Chemistry, Faculty of Material Science, University of Miskolc , Egyetemváros 1, H-3529 Miskolc, Hungary.,Drug Discovery Research Center , 6720 Szeged, Hungary
| | - Béla Viskolcz
- Institute of Chemistry, Faculty of Material Science, University of Miskolc , Egyetemváros 1, H-3529 Miskolc, Hungary.,Drug Discovery Research Center , 6720 Szeged, Hungary
| |
Collapse
|
3
|
Jr. JH. Methods for the Study of Reversible Denaturation of Proteins and Interpretation of Data. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/9780470110317.ch3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
|
4
|
Lucyk S, Taha H, Yamamoto H, Miskolzie M, Kotovych G. NMR conformational analysis of proadrenomedullin N-terminal 20 peptide, a proangiogenic factor involved in tumor growth. Biopolymers 2006; 81:295-308. [PMID: 16315141 DOI: 10.1002/bip.20418] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The preferred conformation of Proadrenomedullin N-Terminal 20 Peptide (PAMP; ARLDVASEFRKKWNKWALSR-amide) has been determined using 1H and 13C two-dimensional nuclear magnetic resonance (NMR) spectroscopy and molecular modeling. PAMP is a peptide that has various physiological functions, including its role as a proangiogenic factor in facilitating tumor growth and its inhibitory effect on catecholamine secretion at nicotinic receptors. The preferred conformation of PAMP was determined in a helix-inducing trifluoroethanol and water (TFE/H2O) solution, and in a membrane-mimetic sodium dodecylsulfate-d25 (SDS) micellar solution. The secondary structure consists of an alpha-helix for residues Arg2 to Arg20 in TFE/H2O solution and an alpha-helix for residues Arg2 to Ala17 in SDS solution. We postulate that the polar charged residues Arg2, Lys12, and Arg20 are responsible for the initial interaction of the peptide with the micelle, and that this is followed by the binding of the hydrophobic residues Leu3, Val5, Phe9, Trp13, and Trp16 to the micellar core. The three C-terminal amino acid residues adopt an extended structure in SDS, suggesting that they are important in receptor recognition and binding. This is supported by truncation studies done by Mahata et al. (Hypertension, 1998, Vol. 32, pp. 907-916), which show the importance of the C-terminal in physiological activity. Furthermore, Belloni et al. (Hypertension, 1999, Vol. 33, pp. 1185-1189), and Martinez et al. (Cancer Research, 2004, Vol. 64, pp. 6489-6494) suggested that the N-terminal was also important in PAMP activity. However, no differences in conformational preference of the N-terminal were observed between the two solvent systems.
Collapse
Affiliation(s)
- S Lucyk
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | | | | | | | | |
Collapse
|
5
|
Gosal WS, Clark AH, Ross-Murphy SB. Fibrillar β-Lactoglobulin Gels: Part 3. Dynamic Mechanical Characterization of Solvent-Induced Systems. Biomacromolecules 2004; 5:2430-8. [PMID: 15530060 DOI: 10.1021/bm0496615] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oscillatory shear rheometry has been used to study the gelation of beta-lactoglobulin at ambient in 50% v/v trifluoroethanol (TFE)/pH 7 aqueous buffer and in 50% v/v ethanol (EtOH)/water at pH 2. In contrast to what was found on heating aqueous solutions at pH 2 (Part 2 of this series), a more expected "chemical gelation"-like profile was found with modulus components G' and G' ' crossing over as the gels formed and then with G' ' passing through a maximum. In addition, for the EtOH system, there was a significant modulus increase at long time, suggestive of a more complex two-step aggregation scheme. Modulus-concentration relationships were obtained for both systems by extrapolating cure data to infinite time. For the TFE gels, this data was accurately described by classical branching theory, although it could also be approximated by a constant power--law relationship. Only the latter described the modulus--concentration data for the gels in ethanol, but there were problems here of greater frequency dependence of the modulus values and much less certain extrapolation. Gel times for the TFE systems showed higher power laws in the concentration than could be explained by the branching theory in its simplest form being similar, in this respect, to the heat-set systems at pH 2. Such power laws were harder to establish for the EtOH gels as for these there was evidence of gel time divergence close to a critical concentration. Reduced G'/G'inf versus t/tgel data were difficult to interpret for the gels in ethanol, but for the TFE system they were consistent with previous results for the heat-set gels and approximated master curve superposition. The frequency and temperature dependences of the final gel moduli were also studied. In general, the networks induced by alcohols appeared more flexible than those obtained by heating.
Collapse
Affiliation(s)
- Walraj S Gosal
- Department of Life Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NN, United Kingdom
| | | | | |
Collapse
|
6
|
SCHRIER EE, SCHERAGA HA. The effect of aqueous alcohol solutions on the thermal transition of ribonuclease. ACTA ACUST UNITED AC 1998; 64:406-8. [PMID: 13987051 DOI: 10.1016/0006-3002(62)90752-7] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
|
8
|
|
9
|
|
10
|
BIGELOW CC, KRENITSKY TA. THE INFLUENCE OF IONIC STRENGTH AND ORGANIC SOLVENTS ON ACID TRANSITIONS OF PROTEINS. ACTA ACUST UNITED AC 1996; 88:130-41. [PMID: 14203141 DOI: 10.1016/0926-6577(64)90161-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
11
|
Bychkova VE, Dujsekina AE, Klenin SI, Tiktopulo EI, Uversky VN, Ptitsyn OB. Molten globule-like state of cytochrome c under conditions simulating those near the membrane surface. Biochemistry 1996; 35:6058-63. [PMID: 8634247 DOI: 10.1021/bi9522460] [Citation(s) in RCA: 182] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Methanol-induced conformational transitions in cytochrome c have been studied by near- and far-UV circular dichroism, Trp fluorescence, microcalorimetry, and diffusion measurements. The existence of at least two cooperative stages of transition has been shown. At the first stage, the native protein is transformed into an intermediate which has only traces of tertiary structure, but has a native-like secondary structure content and is relatively compact; i.e., it has properties of the molten globule state. On the second stage, the alcohol-induced molten globule is transformed into a more helical state, typical of proteins at high alcohol concentrations. The conditions at which the alcohol-induced molten globule exists (moderately low pH and moderately low dielectric constant) could be similar to those existing near negatively charged membrane surfaces. Consequently, these results might explain how the molten globule state can be achieved under physiological conditions.
Collapse
Affiliation(s)
- V E Bychkova
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | | | | | | | | | | |
Collapse
|
12
|
Cammers-Goodwin A, Allen TJ, Oslick SL, McClure KF, Lee JH, Kemp DS. Mechanism of Stabilization of Helical Conformations of Polypeptides by Water Containing Trifluoroethanol. J Am Chem Soc 1996. [DOI: 10.1021/ja952900z] [Citation(s) in RCA: 204] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
13
|
Rapaka RS, Renugopalakrishnan V, Goehl TJ, Collins BJ. Ethanol induced conformational changes of the peptide ligands for the opioid receptors and their relevance to receptor interaction. Life Sci 1986; 39:837-42. [PMID: 3018416 DOI: 10.1016/0024-3205(86)90463-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The FT-IR (Fourier Transform Infrared) Spectrum of [Met 5]-enkephalinamide in aqueous solution shows the presence of both the beta-turn and beta-sheet conformations. The beta-turn and beta-sheet conformations of enkephalins have been proposed to play a role in receptor selectivity. Addition of ethanol alters these secondary structural features and hence the effect of ethanol on ligand-receptor interaction may be mediated primarily through conformational changes of the ligand rather than those of the receptor.
Collapse
|
14
|
Mishra AK, Ahluwalia JC. Alcohol induced conformational transitions of proteins and polypeptides. Thermodynamic studies of some model compounds. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1983; 21:322-30. [PMID: 6853033 DOI: 10.1111/j.1399-3011.1983.tb03111.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Integral enthalpies of solution of diglycine in tert.-butyl alcohol + water and of diglycine and beta-alanine in ethanol + water mixtures were measured at 298.15 K as a function of alcohol concentration. Enthalpies of transfer of the solutes from water to aqueous alcohol mixtures were evaluated from these data. Entropies of transfer of a peptide backbone unit (CH2CONH) and peptide group (CONH) from water to aqueous ethanol solutions were derived from the enthalpy of transfer data and the free energies of transfer of glycine, alpha-alanine, beta-alanine and diglycine. The thermodynamic transfer functions are discussed in terms of "water structure" mediated solute-solute interactions. The observed trends in the thermodynamic transfer functions have also been utilized to rationalize the effect of alcohols on the conformational stability of proteins and polypeptides in aqueous solutions.
Collapse
|
15
|
HÄGERDAL BÄRBEL. STABILITY OF MYOGLOBIN TO ACETONE TREATMENT CHARACTERIZED BY DIFFERENTIAL SCANNING CALORIMETRY AND RESOLUBILITY IN WATER. J Food Sci 1978. [DOI: 10.1111/j.1365-2621.1978.tb09727.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
16
|
Ikai A. Denaturation of subtilisin BPN' and its derivatives in aqueous guanidine hydrochloride solutions. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 445:182-93. [PMID: 8137 DOI: 10.1016/0005-2744(76)90171-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The denaturation of subtilisin BPN' (EC 3.4.21.14) in guanidine hydrochloride was studied in order to find possible reasons for the exceptional stability of this enzyme against the action of denaturing agents including guanidine hydrochloride. Chemically modified subtilisins, i.e., phenylmethanesulfonylsubtilisin and thio-subtilisin, were completely denatured in 2 M guanidine hydrochloride at pH 7 without autolysis but they were stable in 0.5 M guanidine hydrochloride for at least 60 h. On the other hand, once completely denatured, the subtilisins remained inactive and in highly unfolded conformations for 60 h or longer after transfer into 0.5 M guanidine solution at pH 7 or 9. No enzymatic activity was regained when the guanidine concentration was lowered to almost zero. We concluded from these and other results described in this paper that this enzyme was thermodynamically unstable in 2 M guanidine hydrochloride at 20 degrees C and at pH 7. We wish to point out the possibility that the denaturation of this enzyme could indeed be irreversible.
Collapse
|
17
|
Edelhoch H, Osborne JC. The thermodynamic basis of the stability of proteins, nucleic acids, and membranes. ADVANCES IN PROTEIN CHEMISTRY 1976; 30:183-250. [PMID: 779430 DOI: 10.1016/s0065-3233(08)60480-5] [Citation(s) in RCA: 128] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
18
|
Ikehara K, Utiyama H. Studies on the structure of filamentous bacteriophage fd. III. A stable intermediate of the 2-chloroethanol-induced disassembly. Virology 1975; 66:316-21. [PMID: 1136141 DOI: 10.1016/0042-6822(75)90201-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
19
|
Danzer LA, Ades H, Rees ED. The helical content of zein, a water insoluble protein, in non-aqueous solvents. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 386:26-31. [PMID: 1125275 DOI: 10.1016/0005-2795(75)90242-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The conformation of zein, a seed protein from corn, was determined by optical rotary dispersion measurements in a wide variety of nonaqueous solvents. Over a wide range of dielectric constants, in pure and mixed solvent systems, the helical content was independent of dielectric constant. Determination of the helical content of insulin and ribonuclease in several of these solvents indicated a variation in secondary structure comparable of that of zein. Though virtually insoluble in water, zein not only is a globular protein in nonaqueous solutions, but has conformational properites characteristic of more conventionally behaving globular proteins.
Collapse
|
20
|
|
21
|
Yokoi H, Isobe T. MOLECULAR ASSOCIATION OF THE 1:2 COMPLEXES OF COPPER(II) WITH AMINO ACIDS IN AQUEOUS MEDIA. CHEM LETT 1972. [DOI: 10.1246/cl.1972.95] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
22
|
|
23
|
|
24
|
The Effect of Aliphatic Alcohols on the Helix-Coil Transition of Poly-l-ornithine and Poly-l-glutamic Acid. J Biol Chem 1970. [DOI: 10.1016/s0021-9258(18)63000-5] [Citation(s) in RCA: 86] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
25
|
Sugiyama H, Noda H. Stability of the helical conformation of random L-alanine-L-lysine copolymers in aqueous solution. Biopolymers 1970; 9:459-69. [PMID: 5436172 DOI: 10.1002/bip.1970.360090408] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
26
|
Puchtler H, Waldrop FS, Meloan SN, Terry MS, Conner HM. Methacarn (methanol-Carnoy) fixation. Practical and theoretical considerations. HISTOCHEMIE. HISTOCHEMISTRY. HISTOCHIMIE 1970; 21:97-116. [PMID: 4907154 DOI: 10.1007/bf00306176] [Citation(s) in RCA: 168] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
27
|
|
28
|
|
29
|
|
30
|
|
31
|
|
32
|
|
33
|
Zahler PH, Wallach DF. Isolation of lipid-free plasma membrane proteins by gel filtration on Sephadex LH-20 using 2-chloroethanol-water as solvent. BIOCHIMICA ET BIOPHYSICA ACTA 1967; 135:371-4. [PMID: 6037368 DOI: 10.1016/0005-2736(67)90135-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
34
|
Bauer S, Avigad G. Precipitation of Enzymes and their Stability in High Alcohol Concentrations. Isr J Chem 1967. [DOI: 10.1002/ijch.196700020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
35
|
Bonar LC, Mechanic GL, Glimcher MJ. Optical rotatory dispersion studies of the neutral soluble proteins of embryonic bovine enamel. JOURNAL OF ULTRASTRUCTURE RESEARCH 1965; 13:296-307. [PMID: 5841870 DOI: 10.1016/s0022-5320(65)80078-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
36
|
Hirs CH, Halmann M, Kycia JH. Dinitrophenylation and inactivation of bovine pancreatic ribonuclease A. Arch Biochem Biophys 1965; 111:209-22. [PMID: 5851875 DOI: 10.1016/0003-9861(65)90343-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
37
|
Martin CJ, Bhanagar GM. Conformational transitions of diisopropylphosphoryl-chymotrypsin in chloroethanol. BIOCHIMICA ET BIOPHYSICA ACTA 1965; 99:200-3. [PMID: 5859563 DOI: 10.1016/s0926-6593(65)80029-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
38
|
|
39
|
Goto S. Studies of the Hydration and the Structure of Water and Their Roles in Protein Structure. I. The Effective Volumes of 1-1 Electrolytes in Aqueous Solutions and the Electrostriction of Water. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1964. [DOI: 10.1246/bcsj.37.1685] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
40
|
Miyamoto T. Inerease of the resistance to herbicide by the seed treatment with 2-chloroethanol in spinach seedlings. Naturwissenschaften 1963. [DOI: 10.1007/bf00836605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
41
|
|
42
|
|
43
|
Brahms J, Kay CM. The Role of Solvent-induced Conformational Changes on the Enzymatic Adenosine Triphosphatase Activity of Cardiac Myosin A. J Biol Chem 1962. [DOI: 10.1016/s0021-9258(19)70837-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
44
|
Antagonistic Effect of Urea and 2-Chloroethanol on the Resistance to High Salt Concentration in Wheat Seedlings. Nature 1962. [DOI: 10.1038/196491b0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
45
|
TONOMURA Y, TOKURA S, SEKIYA K, IMAMURA K. Influence of solvent composition on the molecular shape and the enzymic activity of myosin A. Arch Biochem Biophys 1961; 95:229-36. [PMID: 13921876 DOI: 10.1016/0003-9861(61)90139-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
46
|
Tanford C, De PK. The Unfolding of β-Lactoglobulin at pH 3 by Urea, Formamide, and Other Organic Substances. J Biol Chem 1961. [DOI: 10.1016/s0021-9258(19)63290-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
47
|
FOSS JG. Hydrophobic bonding and conformational transitions in lysozyme, ribonuclease and chymotrypsin. ACTA ACUST UNITED AC 1961; 47:569-79. [PMID: 13700946 DOI: 10.1016/0006-3002(61)90552-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
48
|
URNES P, DOTY P. Optical rotation and the conformation of polypeptides and proteins. ADVANCES IN PROTEIN CHEMISTRY 1961; 16:401-544. [PMID: 13995485 DOI: 10.1016/s0065-3233(08)60033-9] [Citation(s) in RCA: 336] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
|
49
|
EDELHOCH H, LIPPOLDT RE. The optical rotatory and viscometric properties of γ-poly-D-glutamate. ACTA ACUST UNITED AC 1960; 45:205-16. [PMID: 13725656 DOI: 10.1016/0006-3002(60)91445-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|