1
|
Lu Y, Joy M, Bloom BP, Waldeck DH. Beyond Stereoisomeric Effects: Exploring the Importance of Intermolecular Electron Spin Interactions in Biorecognition. J Phys Chem Lett 2023; 14:7032-7037. [PMID: 37524051 PMCID: PMC10424231 DOI: 10.1021/acs.jpclett.3c01595] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 07/26/2023] [Indexed: 08/02/2023]
Abstract
This work shows that electron spin polarization and stereoisomeric effects make comparable contributions to the enantioselective binding of amino acids. Magneto-electrochemical quartz crystal microbalance methods are used to study the adsorption of chiral amino acids onto a monolayer film of chiral molecules that are spin polarized by an underlying ferromagnetic substrate. The direction of the electron spin polarization affects both the kinetics and thermodynamics of the enantiospecific adsorption of the amino acids. Comparison of these data with the circular dichroism (CD) spectra of the amino acid adsorbates shows that the CD spectrum of the interacting group provides a good figure-of-merit for predicting the contributions of electron spin to the intermolecular interaction. These findings demonstrate the importance of electron spin in enantioselective intermolecular interactions between chiral amino acids and represent a paradigm shift for how selectivity should be viewed in biorecognition.
Collapse
Affiliation(s)
- Yiyang Lu
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Meera Joy
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Brian P. Bloom
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - David H. Waldeck
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
2
|
Saraiva MA. Interpretation of α-synuclein UV absorption spectra in the peptide bond and the aromatic regions. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 212:112022. [DOI: 10.1016/j.jphotobiol.2020.112022] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 08/14/2020] [Accepted: 09/05/2020] [Indexed: 10/23/2022]
|
3
|
Popp A, Scheerer D, Heck B, Hauser K. Biomolecular dynamics studied with IR-spectroscopy using quantum cascade lasers combined with nanosecond perturbation techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 181:192-199. [PMID: 28364666 DOI: 10.1016/j.saa.2017.03.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/17/2017] [Accepted: 03/19/2017] [Indexed: 06/07/2023]
Abstract
Early events of protein folding can be studied with fast perturbation techniques triggering non-equilibrium relaxation dynamics. A nanosecond laser-excited pH-jump or temperature-jump (T-jump) was applied to initiate helix folding or unfolding of poly-l-glutamic acid (PGA). PGA is a homopolypeptide with titratable carboxyl side-chains whose protonation degree determines the PGA conformation. A pH-jump was realized by the photochemical release of protons and induces PGA folding due to protonation of the side-chains. Otherwise, the helical conformation can be unfolded by a T-jump. We operated under conditions where PGA does not aggregate and temperature and pH are the regulatory properties of its conformation. The experiments were performed in such a manner that the folding/unfolding jump proceeded to the same PGA conformation. We quantified the increase/decrease in helicity induced by the pH-/T-jump and demonstrated that the T-jump results in a relatively small change in helical content in contrast to the pH-jump. This is caused by the strong pH-dependence of the PGA conformation. The conformational changes were detected by time-resolved single wavelength IR-spectroscopy using quantum cascade lasers (QCL). We could independently observe the kinetics for α-helix folding and unfolding in PGA by using different perturbation techniques and demonstrate the high sensitivity of time-resolved IR-spectroscopy to study protein folding mechanisms.
Collapse
Affiliation(s)
- Alexander Popp
- Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - David Scheerer
- Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Benjamin Heck
- Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - Karin Hauser
- Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany.
| |
Collapse
|
4
|
Amdursky N, Stevens MM. Circular Dichroism of Amino Acids: Following the Structural Formation of Phenylalanine. Chemphyschem 2015; 16:2768-2774. [DOI: 10.1002/cphc.201500260] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/18/2015] [Indexed: 11/09/2022]
|
5
|
Lenard J. SECTION OF BIOPHYSICS: THE PHYSICAL, CHEMICAL AND BIOLOGICAL ASPECTS OF THIN FILMS. II. BIOLOGICAL MEMBRANES-CURRENT APPROACHES*, †. ACTA ACUST UNITED AC 2012. [DOI: 10.1111/j.2164-0947.1969.tb02009.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
6
|
Abstract
Light changes the structure of chloroplasts. This effect was investigated by high resolution electron microscopy, photometric methods, and chemical modification. (a) A reversible contraction of chloroplast membrane occurs upon illumination, dark titration with H+, or increasing osmolarity. These gross structural changes arise from a flattening of the thylakoids, with a corresponding decrease in the spacing between membranes. Microdensitometry showed that illumination or dark addition of H+ resulted in a 13–23% decrease in membrane thickness. Osmotically contracted chloroplasts do not show this effect. (b) Rapid glutaraldehyde fixation during actual experiments revealed that transmission changes are closely correlated with the spacing changes and therefore reflect an osmotic mechanism, whereas the light scattering changes have kinetics most similar to changes in membrane thickness or conformation. (c) Kinetic analysis of light scattering and transmission changes with the changes in fluorescence of anilinonaphthalene sulfonic acid bound to membranes revealed that fluorescence preceded light scattering or transmission changes. (d) It is concluded that the temporal sequence of events following illumination probably are protonation, changes in the environment within the membrane, change in membrane thickness, change in internal osmolarity accompanying ion movements with consequent collapse and flattening of thylakoid, change in the gross morphology of the inner chloroplast membrane system, and change in the gross morphology of whole chloroplasts.
Collapse
Affiliation(s)
- S Murakami
- Department of Physiology-Anatomy, University of California, Berkeley, California 94720
| | | |
Collapse
|
7
|
Abstract
Human salivary histatin-5 (Hsn-5), a 24-amino acid polypeptide, is a potent candidacidal molecule. In this study, we have explored the following two hypotheses: More potent Hsn molecules may be achieved by duplication of the functional domain of Hsn-5 (C16, residues 9-24 of Hsn-5), and Hsn may act like other cationic peptides which aggregate and form channels across the target membrane. A PCR-based gene splicing by overlap extension (SOE) method was used to construct the DNA fragments encoding the following fusion molecules: Hsn-5--Hsn-5, Hsn-5--C16, and C16--C16. These constructs were expressed in E. coli, the proteins produced were purified, and their anticandidal activities as well as secondary structures were determined. Contrary to our hypotheses, results showed that none of the multimers possessed increased candidacidal activity. Specifically, C16--C16 and Hsn-5--C16 displayed candidacidal activity comparable with that of Hsn-5, while Hsn-5--Hsn-5 possessed significantly decreased candidacidal activity, yet all molecules retained an alpha-helical structure in a hydrophobic environment. Additionally, the circular dichroism data showed that Hsn-5 in an alpha-helical conformation does not aggregate in a hydrophobic environment, not even at 14- to 18-fold its physiological concentration. Our results suggest that the development of enhanced Hsn-5 molecules may not be achieved by duplication of its functional domain, and that Hsns may not act like other antimicrobial cationic peptides which aggregate and form channels across the target membrane.
Collapse
Affiliation(s)
- H Situ
- Department of Oral Biology, School of Dental Medicine, State University of New York at Buffalo, 14214, USA
| | | | | |
Collapse
|
8
|
Manning MC. Underlying assumptions in the estimation of secondary structure content in proteins by circular dichroism spectroscopy--a critical review. J Pharm Biomed Anal 1989; 7:1103-19. [PMID: 2490370 DOI: 10.1016/0731-7085(89)80049-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Recombinant DNA technology has made possible the large-scale production of proteins for pharmaceutical applications. As a result, there has been a renaissance in methodology which can provide information on the structural stability and character of these materials. Circular dichroism (CD) spectroscopy, with its sensitivity to the secondary structure adopted by the polypeptide chain, is a powerful tool in this regard. Quantitative analysis of the CD spectra of proteins is now wide-spread, aided by the availability of such algorithms on commercial instrumentation. However, there are basic assumptions made when conducting these calculations, many of which have not been addressed or summarized. Some of these assumptions are independent of the selection of basis spectra and the algorithm employed. These assumptions are listed and the available data concerning their validity is presented and discussed.
Collapse
Affiliation(s)
- M C Manning
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence 66045
| |
Collapse
|
9
|
|
10
|
SenŌ M, Noritomi H, Kuroyanagi Y, Iwamoto K, Ebert G. Conformational studies of basic poly (α-amino acid)s in reversed micelles. Colloid Polym Sci 1984. [DOI: 10.1007/bf01451545] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
11
|
Masujima T, Yamaoka K, Hori JI. Conformational Changes of the Poly(α-L-glutamic acid)–Cu(II) Macromolecular Complexes in the pH Range 4–7. A Comparative Study by Means of Viscosity and Circular Dichroism. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1983. [DOI: 10.1246/bcsj.56.1030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
12
|
Ebert G, Kuroyanagi Y. Salt effects on the conformation of a ‘statistical’ copolymer of l-leucine and l-lysine. POLYMER 1982. [DOI: 10.1016/0032-3861(82)90369-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
13
|
Yamaoka K, Masujima T. The Visible-UV Absorption and Circular Dichroism Studies of Poly(α-L-glutamic acid)–Copper(II) Complexes with Emphasis on the Extrinsic Cotton Effect. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1979. [DOI: 10.1246/bcsj.52.1286] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
14
|
Hiraoki T, Hikichi K. 13C Nuclear Magnetic Relaxation of Poly(D-glutamic acid) in Aqueous Solution. Polym J 1979. [DOI: 10.1295/polymj.11.299] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
15
|
Ikeda S, Fukutome A, Imae T, Yoshida T. Circular dichroism and the pH-induced ?-coil transition of poly(S-carboxymethyl-L-cysteine) and its side-chain homolog. Biopolymers 1979. [DOI: 10.1002/bip.1979.360180210] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
16
|
Matsuda Y, Beppu T, Arima K. Circular dichroism of Fusarium lipoxygenase from Fusarium oxysporum. Biochem Biophys Res Commun 1978; 85:203-8. [PMID: 33673 DOI: 10.1016/s0006-291x(78)80030-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
17
|
Tamburro AM, Guantieri V, Daga-Gordini D, Abatangelo G. Conformational transitions of alpha-elastin. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 492:370-6. [PMID: 884137 DOI: 10.1016/0005-2795(77)90088-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The alpha-elastin, the soluble product obtained from elastin by oxalic acid hydrolysis, has been studied from a conformational point of view in different conditions using circular dichroism spectroscopy. The spectral variations of the alpha-elastin dissolved in water and in different organic solvents/water mixtures have been examined in order to establish the effect of the solvents on the structural properties of the protein. The effect of calcium ions has also been studied on alpha-elastin dissolved either in water or in organic solvents. Finally, the effect of pH and temperature on the conformational properties of the alpha-elastin has been investigated.
Collapse
|
18
|
Nakamura S, Hayashi S, Koga K. Effect of periodate oxidation on the structure and properties of glucose oxidase. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 445:294-308. [PMID: 182278 DOI: 10.1016/0005-2744(76)90084-x] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In order to elucidate the molecular structure of glucose oxidase (beta-D-glucose: oxygen 1-oxidoreductase, EC 1.1.3.4) and the roles of its carbohydrate moiety, chemical, physiochemical and immunological experiments were performed with enzyme samples before and after periodate oxidation. Hydrodynamic parameters indicated that the native enzyme was a globular protein with values of 1.21 for the frictional ratio and 43 A for the Stokes radius. The enzyme contained about 12% carbohydrate by weight, of which the main component was mannose. The periodate treatment decreased the carbohydrate content to about 40% of its original value. Slight modifications were detected in the absorbance spectrum and the content of arginyl residue. However, no significant alteration was brought about by this treatment in the catalytic parameters, immunological reactivities of the gross structure, not in the secondary and quaternary structures of the protein moity. Thermal denaturation temperature (about 72.5 degrees C) and the enthalpy of denaturation (about 450 kcal/mol) were common to the native and the periodate-oxodozed enzymes. The native was found to be quite resistant to sodium dodecyl sulfate and fairly stable to urea and heating. The periodate-oxidized enzyme was also stable to heat treatment, but it showed a diminished stability when denaturing agents were present. Kinetic analyses of the thermal inactivation processes showed that the entropy of activation was greatly decreased by the denaturing agents, especially in the case of the periodate-oxidized enzyme. It is concluded that the carbohydrate moiety of the enzyme plays a role in increasing the stability of the protein moiety, but does not directly participate in the catalytic activity, the immunological reactivity, or in maintaining the conformation of the enzyme protein.
Collapse
|
19
|
Hayashi S, Nakamura S. Comparison of fungal glucose oxidases. Chemical, physicochemical and immunological studies. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 438:37-48. [PMID: 59610 DOI: 10.1016/0005-2744(76)90221-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Glucose oxidases (beta-D-glucose:oxygen 1-oxidoreductase, EC 1.1.3.4) from two fungal genera (Aspergillus and Penicillium) were studied chemically, physicochemically and immunologically to elucidate the similarities and dissimilarities between these enzymes. Investigation of circular dichroism spectra revealed that these enzymes proteins possess essentially identical conformations. However, differences found in thermal inactivation parameters, catalytic parameters and quantitative immunological reactivities indicate that these enzymes must have some minor but distinct variations in their structures. Interestingly, it was observed that the Penicillium enzyme cross-reacted with the antiserum against the Aspergillus enzyme with an association constant of two orders of magnitude lower than that of the Aspergillus enzyme, and that the precipitin one of the Penicillium enzyme fused together with that of the Aspergillus enzyme in the immunodouble diffusion test. These results lead to the conclusion that these enzymes are closely related but not completely identical, and suggest that they might have evolved from a common ancestral precursor.
Collapse
|
20
|
Wells BD. Circular dichroism spectra of glutamate dehydrogenase plus reduced nicotinamide adenine dinucleotide. Arch Biochem Biophys 1975; 171:287-91. [PMID: 172023 DOI: 10.1016/0003-9861(75)90035-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
21
|
Freedberg IM, Levin Y, Kay CM, McCubbin WD, Katchalski-Katzir E. Purification and characterization of Aspergillus niger exo-1,4-glucosidase. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 391:361-81. [PMID: 238601 DOI: 10.1016/0005-2744(75)90260-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A specific exo-1,4-glucosidase (1,4-alpha-D-glucan glucohydrooase, EC 3.2.1.3) from Aspergillus niger has been partially purified and subsequently characterized by biochemical, physico-chemical and optical methods. Molecular sieve chromatography yields an enzyme with maximal activity at pH 4.2-4.5 close to its isoelectric point. Reduction and carboxymethylation leads to complete loss of activity and O-acetylation of 3 of the 13 tyrosine residues results in loss of 20 % of the activity. Sodium dodecylsulfate-polyacrylamide gel electrophoresis indicates that the native enzyme consists of two major components of molecular weights 63 000 and 57 500, respectively. Small amounts of dissociated material of molecular weight 28 000 and 16 000 as well as aggregates of the order of 100 000 are also present to the extent of 2-5% of the total potein. Following reduction and carboxymethylation under forcing conditions, the bands around 60 000 diminish and the 28 000-30 000, 16 000 and aggregate bands are dominant...
Collapse
|
22
|
Zimmerman SS, Clark JC, Mandelkern L. The precipitation of poly-L-glutamic acid. II. beta-Precipitation. Biopolymers 1975; 14:585-96. [PMID: 1174680 DOI: 10.1002/bip.1975.360140312] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
23
|
Zimmerman SS, Mandelkern L. The precipitation of poly-L-glutamic acid. I. Alpha-precipitation. Biopolymers 1975; 14:567-84. [PMID: 240460 DOI: 10.1002/bip.1975.360140311] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
24
|
|
25
|
Effects of Cation Binding on the Conformation of Calsequestrin and the High Affinity Calcium-binding Protein of Sarcoplasmic Reticulum. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(20)79898-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
26
|
Nakamura S, Hayashi S. A role of the carbohydrate moiety of glucose oxidase: kinetic evidence for protection of the enzyme from thermal inactivation in the presence of sodium dodecyl sulfate. FEBS Lett 1974; 41:327-30. [PMID: 4368351 DOI: 10.1016/0014-5793(74)81240-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
27
|
Biró EN, Coelho R, Ehrlich E, Guillain F, Dvonc C. Preparation of the enzymatically active subfragment of myosin by proteolysis of myofibrils. EUROPEAN JOURNAL OF BIOCHEMISTRY 1973; 40:527-31. [PMID: 4360901 DOI: 10.1111/j.1432-1033.1973.tb03223.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
28
|
Tiffany ML, Krimm S. Extended conformations of polypeptides and proteins in urea and guanidine hydrochloride. Biopolymers 1973. [DOI: 10.1002/bip.1973.360120310] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
29
|
Lüllmann H, Preuner J. Effect of diisopropylfluorophosphate, edrophonium and a stabilizing agent on the conformation of acetylcholinesterase. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 1973; 280:339-51. [PMID: 4274701 DOI: 10.1007/bf00506627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
30
|
Adler AJ, Greenfield NJ, Fasman GD. Circular dichroism and optical rotatory dispersion of proteins and polypeptides. Methods Enzymol 1973; 27:675-735. [PMID: 4797940 DOI: 10.1016/s0076-6879(73)27030-1] [Citation(s) in RCA: 397] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
31
|
Yamamoto H, Hayakawa T. Synthesis and conformational study of poly(N -benzyl-L-lysine) and its benzyloxycarbonyl derivative. Biopolymers 1972; 11:1259-68. [PMID: 5038711 DOI: 10.1002/bip.1972.360110610] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
32
|
Urry DW. CONFORMATION OF PROTEIN IN BIOLOGICAL MEMBRANES AND A MODEL TRANSMEMBRANE CHANNEL*. Ann N Y Acad Sci 1972; 195:108-125. [DOI: 10.1111/j.1749-6632.1972.tb54789.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
33
|
Warashina A, Ikegami A. Thermal and charge-induced coil to -helix transition of poly-L-glutamic acid and random L-glutamic acid-L-alanine copolymers. Biopolymers 1972; 11:529-47. [PMID: 5016115 DOI: 10.1002/bip.1972.360110302] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
34
|
Bewley TA, Li CH. Circular dichroism studies on human pituitary growth hormone and ovine pituitary lactogenic hormone. Biochemistry 1972; 11:884-8. [PMID: 5059894 DOI: 10.1021/bi00755a030] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
35
|
Zahler WL, Puett D, Fleischer S. Circular dichroism of mitochondrial membranes before and after extraction of lipids and surface proteins. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 255:365-79. [PMID: 5011003 DOI: 10.1016/0005-2736(72)90035-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
36
|
|
37
|
Budzynski AZ, Means GE. Inhibition of polymerization of tobacco mosaic virus protein by modification of carboxyl groups. BIOCHIMICA ET BIOPHYSICA ACTA 1971; 236:767-76. [PMID: 5559971 DOI: 10.1016/0005-2795(71)90261-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
38
|
Muramatsu N, Noso Y. Purification and characterization of glucose-6-phosphate isomerase from Bacillus stearothermophilus. Arch Biochem Biophys 1971; 144:245-52. [PMID: 5117529 DOI: 10.1016/0003-9861(71)90475-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
39
|
Sugimoto S, Noso Y. Thermal properties of fructose-I,6-diphosphate aldolase from thermophilic bacteria. BIOCHIMICA ET BIOPHYSICA ACTA 1971; 235:210-21. [PMID: 4996827 DOI: 10.1016/0005-2744(71)90049-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
40
|
Budzynski AZ. Difference in conformation of fibrinogen degradation products as revealed by hydrogen exchange and spectropolarimetry. BIOCHIMICA ET BIOPHYSICA ACTA 1971; 229:663-71. [PMID: 4252126 DOI: 10.1016/0005-2795(71)90282-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
41
|
Steigman J, Cosani A. Potentiometric and circular dichroic measurements of poly(L-glutamic acid) in aqueous solutions of organic and inorganic electrolytes at ambient temperature. Biopolymers 1971; 10:357-77. [PMID: 5545529 DOI: 10.1002/bip.360100211] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
42
|
|
43
|
Cassim JY, Yang JT. Critical comparison of the experimental optical activity of helical polypeptides and the predictions of the molecular exciton model. Biopolymers 1970; 9:1475-502. [PMID: 5489315 DOI: 10.1002/bip.1970.360091209] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
44
|
McCubbin WD, Kay CM. Physicochemical studies on bovine cardiac globular actin. BIOCHIMICA ET BIOPHYSICA ACTA 1970; 214:272-81. [PMID: 5503384 DOI: 10.1016/0005-2795(70)90004-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
45
|
Hachimori A, Muramatsu N, Noso Y. Studies on an ATPase of thermophilic bacteria. I. Purification and properties. BIOCHIMICA ET BIOPHYSICA ACTA 1970; 206:426-37. [PMID: 4248217 DOI: 10.1016/0005-2744(70)90158-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
46
|
Wrigglesworth JM, Packer L. pH-dependent changes in mitochondrial membrane structure. JOURNAL OF BIOENERGETICS 1970; 1:33-43. [PMID: 5005950 DOI: 10.1007/bf01516087] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
47
|
Wallach DF, Graham JM, Oseroff AR. Application of laser Raman spectroscopy to the structural analysis of polypeptides in dilute aqueous solution. FEBS Lett 1970; 7:330-334. [PMID: 11947507 DOI: 10.1016/0014-5793(70)80197-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- D F.H. Wallach
- Biochemical Research Laboratory, Massachusetts General Hospital, 02114, Boston, Massachusetts, USA
| | | | | |
Collapse
|
48
|
Urry DW, Hinners TA, Masotti L. Calculation of distorted circular dichroism curves for poly-L-glutamic acid suspensions. Arch Biochem Biophys 1970; 137:214-21. [PMID: 5435058 DOI: 10.1016/0003-9861(70)90428-5] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
49
|
Permogorov VI, Debabov VG, Sladkova IA, Rebentish BA. Structure of DNA and histones in the nucleohistone. BIOCHIMICA ET BIOPHYSICA ACTA 1970; 199:556-8. [PMID: 5418393 DOI: 10.1016/0005-2787(70)90107-3] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
50
|
Klein D, Foster JF, Koffler H. Changes in polarimetric parameters associated with the polymerization of flagellin into flagellar filaments. Biochem Biophys Res Commun 1969; 36:844-50. [PMID: 5808300 DOI: 10.1016/0006-291x(69)90686-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|