51
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Altmann KH, Wójcik J, Vásquez M, Scheraga HA. Helix-coil stability constants for the naturally occurring amino acids in water. XXIII. Proline parameters from random poly (hydroxybutylglutamine-co-L-proline). Biopolymers 1990; 30:107-20. [PMID: 2224046 DOI: 10.1002/bip.360300112] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Water-soluble random copolymers containing L-proline and N5-(4-hydroxybutyl)-L-glutamine were synthesized by copolymerization of the tripeptides H-L-Glu(OBzl)-L-Glu(OBzl)-L-Glu(OBzl)-OH and H-L-Glu(OBzl)-L-Pro-L-Glu(OBzl)-OH, using benzotriazolyl-N-oxy-tris(dimethylamino)-phosphonium hexafluorophosphate as condensing reagent, and subsequent aminolysis of the Bzl ester groups with 4-amino-1-butanol. These copolymers were found to contain significant amounts of N5-(4-hydroxybutyl)-D-glutamine, thus requiring the synthesis of a binary copolymer containing only D- and L-N5-(4-hydroxybutyl)glutamine residues in order to evaluate the possible effects of the D-residues on the conformational properties of poly(hydroxybutylglutamine-co-L-proline). The different copolymers were fractionated, and their thermally induced helix-coil transition curves were obtained in water at neutral pH. When proper corrections were applied for the helix-destabilizing properties of N5-(4-hydroxybutyl)-D-glutamine, the Zimm-Bragg parameters sigma and s for L-proline could be deduced from the melting curves of poly(hydroxybutylglutamine-co-L-proline). The results indicate that L-proline acts as a very strong helix breaker over the entire temperature range from 0 to 60 degrees C.
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Affiliation(s)
- K H Altmann
- Baker Laboratory of Chemistry, Cornell University, Ithaca, New York 14853-1301
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52
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Shoemaker KR, Fairman R, Schultz DA, Robertson AD, York EJ, Stewart JM, Baldwin RL. Side-chain interactions in the C-peptide helix: Phe 8 ... His 12+. Biopolymers 1990; 29:1-11. [PMID: 2328280 DOI: 10.1002/bip.360290104] [Citation(s) in RCA: 96] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Previous studies have demonstrated that His 12 plays a major role in the pH-dependent stability of the helix formed by the isolated C-peptide (residues 1-13 of ribonuclease A). Here, amino acid replacement experiments show that His 12+ stabilizes the C-peptide helix chiefly by interacting with Phe 8. The Phe 8 ... His 12+ ring interaction is specific for the protonated form of His 12 (His 12+) and the interaction is not screened significantly by NaCl, unlike the charged group ... helix dipole interactions studied earlier in C-peptide. Analogs of C-peptide that are unable to form the Phe 8 ... His 12+ interaction show large increases in helix content for Phe----Ala and His----Ala. Therefore, the helical tendencies of the individual residues Phe, His, and Ala are important in determining the result of a replacement experiment. Since the side chains of Phe 8 and His 12 probably interact within the N-terminal helix of ribonuclease A, the existence of the Phe 8 ... His 12+ interaction in the isolated C-peptide helix adds to the evidence that the C-peptide helix is an autonomous folding unit.
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Affiliation(s)
- K R Shoemaker
- Department of Biochemistry, Stanford University, California 94305
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53
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Abstract
Recombinant DNA technology has now made it possible to produce proteins for pharmaceutical applications. Consequently, proteins produced via biotechnology now comprise a significant portion of the drugs currently under development. Isolation, purification, formulation, and delivery of proteins represent significant challenges to pharmaceutical scientists, as proteins possess unique chemical and physical properties. These properties pose difficult stability problems. A summary of both chemical and physical decomposition pathways for proteins is given. Chemical instability can include proteolysis, deamidation, oxidation, racemization, and beta-elimination. Physical instability refers to processes such as aggregation, precipitation, denaturation, and adsorption to surfaces. Current methodology to stabilize proteins is presented, including additives, excipients, chemical modification, and the use of site-directed mutagenesis to produce a more stable protein species.
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Affiliation(s)
- M C Manning
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence 66045
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54
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Mutter M, Vuilleumier S. Ein chemischer Weg zu neuen Proteinen – Templat-assoziierte synthetische Proteine (TASP). Angew Chem Int Ed Engl 1989. [DOI: 10.1002/ange.19891010504] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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55
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Mutter M, Vuilleumier S. A Chemical Approach to Protein Design?Template-Assembled Synthetic Proteins (TASP). ACTA ACUST UNITED AC 1989. [DOI: 10.1002/anie.198905353] [Citation(s) in RCA: 328] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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56
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Holtzer A. The effect of sequence-specific interactions on the stability of the alpha-helix in synthetic tropomyosin-analogue peptides. Biopolymers 1989; 28:901-5. [PMID: 2720129 DOI: 10.1002/bip.360280408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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57
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Fabry S, Lang J, Niermann T, Vingron M, Hensel R. Nucleotide sequence of the glyceraldehyde-3-phosphate dehydrogenase gene from the mesophilic methanogenic archaebacteria Methanobacterium bryantii and Methanobacterium formicicum. Comparison with the respective gene structure of the closely related extreme thermophile Methanothermus fervidus. EUROPEAN JOURNAL OF BIOCHEMISTRY 1989; 179:405-13. [PMID: 2492940 DOI: 10.1111/j.1432-1033.1989.tb14568.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The genes for glyceraldehyde-3-phosphate dehydrogenase (gap genes) from the mesophilic methanogenic archaebacteria Methanobacterium formicicum and Methanobacterium bryantii were cloned and sequenced. The deduced amino acid sequences show 95% identity to each other and about 70% identity to the glyceraldehyde-3-phosphate dehydrogenase from the thermophilic methanogenic archaebacterium Methanothermus fervidus. Although the sequence similarity between the archaebacterial glyceraldehyde-3-phosphate dehydrogenase and the homologous enzyme of eubacteria and eukaryotes is low, an equivalent secondary-structural arrangement can be deduced from the profiles of the physical parameters hydropathy, chain flexibility and amphipathy. In order to find possible thermophile-specific structural features of the enzyme from M. fervidus, a comparative primary-sequence analysis was performed. Amino acid exchanges leading, to a stabilization of the main-chain conformation, could be found throughout the sequence of the thermophile enzyme. Striking features of the thermophile sequence are the preference for isoleucine, especially in beta-sheets, and a low arginine/lysine ratio of 0.54.
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Affiliation(s)
- S Fabry
- Max-Planck-Institut für Biochemie, Martinsried, Federal Republic of Germany
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58
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Fairman R, Shoemaker KR, York EJ, Stewart JM, Baldwin RL. Further studies of the helix dipole model: effects of a free alpha-NH3+ or alpha-COO- group on helix stability. Proteins 1989; 5:1-7. [PMID: 2748569 DOI: 10.1002/prot.340050102] [Citation(s) in RCA: 116] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Interactions between the alpha-helix peptide dipoles and charged groups close to the ends of the helix were found to be an important determinant of alpha-helix stability in a previous study. The charge on the N-terminal residue of the C-peptide from ribonuclease A was varied chiefly by changing the alpha-NH2 blocking group, and the correlation of helix stability with N-terminal charge was demonstrated. An alternative explanation for some of those results is that the succinyl and acetyl blocking groups stabilize the helix by hydrogen bonding to an unsatisfied main-chain NH group. The helix dipole model is tested here with peptides that contain either a free alpha-NH3+ or alpha-COO- group, and no other charged groups that would titrate with similar pKa's. This model predicts that alpha-NH3+ and alpha-COO- groups are helix-destabilizing and that the destabilizing interactions are electrostatic in origin. The hydrogen bonding model predicts that alpha-NH3+ and alpha-COO- groups are not themselves helix-destabilizing, but that an acetyl or amide blocking group at the N- or C-terminus, respectively, stabilizes the helix by hydrogen bonding to an unsatisfied main-chain NH or CO group. The results are as follows: (1) Removal of the charge from alpha-NH3+ and alpha-COO- groups by pH titration stabilizes an alpha-helix. (2) The increase in helix stability on pH titration of these groups is close to the increase produced by adding an acetyl or amide blocking group.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- R Fairman
- Department of Biochemistry, Stanford University Medical Center, California 94305
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59
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Das G, Hickey DR, McLendon D, McLendon G, Sherman F. Dramatic thermostabilization of yeast iso-1-cytochrome c by an asparagine----isoleucine replacement at position 57. Proc Natl Acad Sci U S A 1989; 86:496-9. [PMID: 2536164 PMCID: PMC286497 DOI: 10.1073/pnas.86.2.496] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Two Saccharomyces cerevisiae yeast mutants, cyc1-73 and cyc1-190, contain nonfunctional and presumably unstable forms of iso-1-cytochrome c due to Gly-34----Ser and His-38----Pro replacements, respectively. Second-site reversions that produced Asn-57----Ile replacements at least partially restored function, presumably by alleviating the instability of these two altered iso-1-cytochromes c. Introduction of the Ile-57 replacement by site-directed mutagenesis in an otherwise normal protein resulted in a 17 degrees C increase in the transition temperature (Tm), corresponding to over a 2-fold increase in the free energy change (delta G degrees) for thermal unfolding.
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Affiliation(s)
- G Das
- Department of Biochemistry, University of Rochester, NY 14642
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60
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Nicholson H, Becktel WJ, Matthews BW. Enhanced protein thermostability from designed mutations that interact with alpha-helix dipoles. Nature 1988; 336:651-6. [PMID: 3200317 DOI: 10.1038/336651a0] [Citation(s) in RCA: 204] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Two different genetically engineered amino-acid substitutions designed to interact with alpha-helix dipoles in T4 lysozyme are shown to increase the thermal stability of the protein. Crystallographic analyses of the mutant lysozyme structures suggest that the stabilization is due to electrostatic interaction and does not require precise hydrogen bonding between the substituted amino acid and the end of the alpha-helix.
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Affiliation(s)
- H Nicholson
- Institute of Molecular Biology, University of Oregon, Eugene 97403
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61
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Sali D, Bycroft M, Fersht AR. Stabilization of protein structure by interaction of alpha-helix dipole with a charged side chain. Nature 1988; 335:740-3. [PMID: 3173493 DOI: 10.1038/335740a0] [Citation(s) in RCA: 172] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The alpha-helix in proteins has a dipole moment resulting from the alignment of dipoles of the peptide bond which can perturb the pKas of ionizing groups. One of the two histidine residues (His18) in barnase, the small ribonuclease from Bacillus amyloliquefaciens, is located at the negatively charged end (C-terminal) of an alpha-helix. From NMR titrations of wild-type and engineered mutants we find that the pKa of His18 is 7.9 in wild-type enzyme, 1.6 units above the value in the urea-denatured enzyme and in model peptides. This implies that there is a favourable interaction between the protonated form of His18 and the alpha-helix that should stabilize the native structure at neutral pH by 2.1 kcal mol-1. Denaturation at various values of pH of wild-type and muant enzymes engineered at position 18 shows that this is so. The increase in stability of the enzyme as the pH changes from 8.5 to 6.3 is attributable to this interaction, and the pH-stability curve fits pKa values for His18 in native and urea-denatured enzymes that are consistent with the NMR data.
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Affiliation(s)
- D Sali
- Department of Chemistry, Imperial College of Science and Technology, London, UK
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62
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Abstract
The refolding of denatured proteins with complete sequences may not be fast enough to account for the in vivo folding of growing peptide chains during biosynthesis. As some peptide fragments have secondary structures not unlike those of the corresponding segments in the intact molecules and native disulfide bonds of some proteins can form cotranslationally, it is suggested that the folding of the nascent chain begins early during synthesis. However, further adjustments may be necessary during chain elongation and after posttranslational modifications of the completed peptide chain to generate the native conformation of a biologically active protein.
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Affiliation(s)
- C L Tsou
- Laboratory of Molecular Enzymology, Academia Sinica, Beijing, China
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63
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Alber T, Bell JA, Sun DP, Nicholson H, Wozniak JA, Cook S, Matthews BW. Replacements of Pro86 in phage T4 lysozyme extend an alpha-helix but do not alter protein stability. Science 1988; 239:631-5. [PMID: 3277275 DOI: 10.1126/science.3277275] [Citation(s) in RCA: 112] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
To investigate the relation between protein stability and the predicted stabilities of individual secondary structural elements, residue Pro86 in an alpha-helix in phage T4 lysozyme was replaced by ten different amino acids. The x-ray crystal structures of seven of the mutant lysozymes were determined at high resolution. In each case, replacement of the proline resulted in the formation of an extended alpha-helix. This involves a large conformational change in residues 81 to 83 and smaller shifts that extend 20 angstroms across the protein surface. Unexpectedly, all ten amino acid substitutions marginally reduce protein thermostability. This insensitivity of stability to the amino acid at position 86 is not simply explained by statistical and thermodynamic criteria for helical propensity. The observed conformational changes illustrate a general mechanism by which proteins can tolerate mutations.
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Affiliation(s)
- T Alber
- Department of Physics, University of Oregon, Eugene 97403
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64
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Bashford D, Cohen FE, Karplus M, Kuntz ID, Weaver DL. Diffusion-collision model for the folding kinetics of myoglobin. Proteins 1988; 4:211-27. [PMID: 3237719 DOI: 10.1002/prot.340040308] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The diffusion-collision model has been used to analyze the folding kinetics of myoglobin. The microdomains, which are the basic units that coalesce during the folding, are identified with the helices and the stabilizing contacts between helices are determined from the native structure. Both association and dissociation reactions are included and a range of stabilization parameters is investigated to determine the variation in overall rate and the relative contributions made by different intermediates during the folding process. In a comparison of folding to the native state and to the midpoint of the folding transition (i.e., 50% native protein at the completion of the reaction) significant differences in the contributing intermediates are found.
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Affiliation(s)
- D Bashford
- Department of Physics, Tufts University, Medford, Massachusetts 02155
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65
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Vásquez M, Scheraga HA. Effect of sequence-specific interactions on the stability of helical conformations in polypeptides. Biopolymers 1988; 27:41-58. [PMID: 3342277 DOI: 10.1002/bip.360270104] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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66
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Affiliation(s)
- W F Degrado
- Central Research and Development Department, E.I. du Pont de Nemours & Company, Incorporated Experimental Station, Wilmington, Delaware 19898
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67
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Matthews BW, Nicholson H, Becktel WJ. Enhanced protein thermostability from site-directed mutations that decrease the entropy of unfolding. Proc Natl Acad Sci U S A 1987; 84:6663-7. [PMID: 3477797 PMCID: PMC299143 DOI: 10.1073/pnas.84.19.6663] [Citation(s) in RCA: 557] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
It is proposed that the stability of a protein can be increased by selected amino acid substitutions that decrease the configurational entropy of unfolding. Two such substitutions, one of the form Xaa----Pro and the other of the form Gly----Xaa, were constructed in bacteriophage T4 lysozyme at sites consistent with the known three-dimensional structure. Both substitutions stabilize the protein toward reversible and irreversible thermal denaturation at physiological pH. The substitutions have no effect on enzymatic activity. High-resolution crystallographic analysis of the proline-containing mutant protein (Ala-82----Pro) shows that its three-dimensional structure is essentially identical with the wild-type enzyme. The overall structure of the other mutant enzyme (Gly-77----Ala) is also very similar to wild-type lysozyme, although there are localized conformational adjustments in the vicinity of the altered amino acid. The combination of a number of such amino acid replacements, each of which is expected to contribute approximately 1 kcal/mol (1 cal = 4.184 J) to the free energy of folding, may provide a general strategy for substantial improvement in the stability of a protein.
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Affiliation(s)
- B W Matthews
- Institute of Molecular Biology, University of Oregon, Eugene 97403
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68
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Shaw WV. Protein engineering. The design, synthesis and characterization of factitious proteins. Biochem J 1987; 246:1-17. [PMID: 3314863 PMCID: PMC1148234 DOI: 10.1042/bj2460001] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- W V Shaw
- Department of Biochemistry, University of Leicester, U.K
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69
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Grafl R, Lang K, Vogl H, Schmid FX. The mechanism of folding of pancreatic ribonucleases is independent of the presence of covalently linked carbohydrate. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)61009-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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70
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71
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Shoemaker KR, Kim PS, York EJ, Stewart JM, Baldwin RL. Tests of the helix dipole model for stabilization of alpha-helices. Nature 1987; 326:563-7. [PMID: 3561498 DOI: 10.1038/326563a0] [Citation(s) in RCA: 458] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Charged groups play a critical role in the stability of the helix formed by the isolated C-peptide (residues 1-13 of ribonuclease A) in aqueous solution. One charged-group effect may arise from interactions between charged residues at either end of the helix and the helix dipole. We report here that studies of C-peptide analogues support the helix dipole model, and provide further evidence for the importance of electrostatic interactions not included in the Zimm-Bragg model for alpha-helix formation.
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72
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Jaenicke R. Folding and association of proteins. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 1987; 49:117-237. [PMID: 3327098 DOI: 10.1016/0079-6107(87)90011-3] [Citation(s) in RCA: 494] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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