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Ptitsyn OB. Method of determining the relative stability of different conformational states of biological macromolecules. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/polc.5070300164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kono K, Nishii H, Takagishi T. Fusion activity of an amphiphilic polypeptide having acidic amino acid residues: generation of fusion activity by alpha-helix formation and charge neutralization. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1164:81-90. [PMID: 8518300 DOI: 10.1016/0167-4838(93)90115-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A sequential polypeptide, poly(Glu-Aib-Leu-Aib) (Aib represents 2-aminoisobutyric acid), was synthesized and the pH-dependence of fusogenic activity of the polypeptide was studied. The polypeptide was designed to take amphiphilic structure upon the formation of alpha-helix. Circular dichroism spectra of the polypeptide showed a negative Cotton effect with double minima, indicative of an alpha-helical conformation. The alpha-helix content was increased with lowering pH and/or increasing the ionic strength. It was found that the polypeptide induces remarkable leakage of calcein from egg-yolk phosphatidylcholine (EYPC) vesicles loaded in the inner aqueous phase with lowering pH and/or increasing ionic strength. The polypeptide caused fusion of EYPC liposomes and dipalmitoylphosphatidylcholine liposomes more strongly with decreasing pH. Moreover, two distinct increases of fusogenic activity of the polypeptide were observed near pH 6.0 and below pH 4.5. The former corresponds to the midpoint of pH-dependent change in helical content of the polypeptide and the latter the pKa of the gamma-carboxyl group of glutamic acid. These results indicate that elevation of the fusogenic activity of the polypeptide is related to the increase in two factors, alpha-helix content and hydrophobicity.
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Affiliation(s)
- K Kono
- Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture, Japan
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Helix formation by poly{bis(hydroxyethyl)-L-glutamine}. Colloid Polym Sci 1986. [DOI: 10.1007/bf01421998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Maeda H, Iwase T, Ikeda S. The Effect of Chain Length on the Formation of the Intermolecular β-Structure of Poly(S-carboxy-methyl-L-cysteine). Polym J 1984. [DOI: 10.1295/polymj.16.471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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5
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Santiago G, Maroun RC, Hawkins ER, Mattice WL. Electrostatic interactions in ionic homopolypeptides in solutions of moderate ionic strength. Biopolymers 1981. [DOI: 10.1002/bip.1981.360201011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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6
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Kuwajima K. A folding model of alpha-lactalbumin deduced from the three-state denaturation mechanism. J Mol Biol 1977; 114:241-58. [PMID: 909087 DOI: 10.1016/0022-2836(77)90208-x] [Citation(s) in RCA: 142] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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8
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Finkelstein AV, Ptitsyn OB, Kozitsyn SA. Theory of protein molecule self-organization. II. A comparison of calculated thermodynamic parameters of local secondary structures with experiments. Biopolymers 1977; 16:497-524. [PMID: 843599 DOI: 10.1002/bip.1977.360160303] [Citation(s) in RCA: 43] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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Estevez J, Loucheux-Lefebvre MH. The stability of the helical conformation of random L-glutamic acid--2-nitrobenzyl-L-glutamate copolymers in aqueous solution. FEBS Lett 1976; 72:157-60. [PMID: 992082 DOI: 10.1016/0014-5793(76)80920-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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10
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Estevez J, Loucheux-Lefebvre MH. Conformational studies in aqueous solution on random copolymers of L-glutamic acid and ortho-nitrobenzyl-L-glutamate. Circular dichroism and potentiometric titration studies. Biopolymers 1976; 15:2101-9. [PMID: 990397 DOI: 10.1002/bip.1976.360151102] [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: 12/25/2022]
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11
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Robson B, Pain RH. The mechanism of folding of globular proteins. Equilibria and kinetics of conformational transitions of penicillinase from Staphylococcus aureus involving a state of intermediate conformation. Biochem J 1976; 155:331-44. [PMID: 938484 PMCID: PMC1172839 DOI: 10.1042/bj1550331] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
1. The thermodynamically reversible unfolding and refolding of penicillinase between the native and fully unfolded states were followed by using guanidinium chloride as denaturant. 2. The equilibria, studied by optical rotation, u.v. absorption, viscosity and enzyme activity, show the presence of a state of intermediate conformation, termed state H, which is stable at 20 degrees C in 0.8 M-guanidinium chloride. 3. The physical properties of this state show that it is slightly expanded with an intrinsic viscosity of 8 ml-g-1, that the 13 tyrosine residues, which are distributed through the primary sequence, are maximally exposed to the solvent and that the helix content is the same as that of the native state. 4. The kinetics of the transition between the native state, state H and the fully unfolded state were followed by u.v. absorption and by optical rotation. They are interpreted as showing that state H lies on the folding pathway between the native and fully unfolded states. 5. The transition between the native state and state H exhibits monophasic unfolding kinetics and biphasic refolding kinetics. This indicates that there must be at least two intermediate states in this process, at least one of which lies on the folding pathway which may also involve cul-de-sac paths. 6. The results are discussed in terms of a mechanism involving rapid stabilization of nucleation regions in a moderately compact but internally solvated structure, with 'native format' [Anfinsen (1973) Science 181, 233-230] secondary structure stabilized by tertiary interaction. The final and rate-limiting step in refolding involves shuffling of these structural elements into the native state. 7. This model is discussed in relation to folding in vivo.
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12
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Nitta K, Yoneyama M. Polymer concentration dependence of the helix to random coil transition of a charged polypeptide in aqueous salt solution. Biophys Chem 1975; 3:323-9. [PMID: 96 DOI: 10.1016/0301-4622(75)80025-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The helix to coil transition of poly(L-glutamic acid) was investigated in 0.05 and 0.005 M aqueous potassium chloride solutions by use of potentiometric titration and circular dichroism measurement. Polymer concentration dependence of the transition was observed in the range from 0.006 to 0.04 monomol/e in 0.005 M KG1 solution. The polymer concentration dependence can be interpreted by current theories of the transition of charged polypeptides and of titration curves of linear weak polyelectrolytes taking the effect of polymer concentration into consideration.
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Mandel R, Fasman GD. The random coil leads to beta transition of copolymers of L-lysine and L-valine: potentiometric titration and circular dichroism studies. Biopolymers 1975; 14:1633-49. [PMID: 239771 DOI: 10.1002/bip.1975.360140808] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Franks F, Eagland D. The role of solvent interactions in protein conformation. CRC CRITICAL REVIEWS IN BIOCHEMISTRY 1975; 3:165-219. [PMID: 1100317 DOI: 10.3109/10409237509102556] [Citation(s) in RCA: 138] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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17
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Bychkova VE, Gudkov AT, Miller WG, Mitin YV, Ptitsyn OB, Shpungin IL. Thermodynamic parameters of the helix-coil transition in polypeptide chains. III. Random copolymers of L-leucine and L-glutamic acid. Biopolymers 1975; 14:1739-53. [PMID: 239773 DOI: 10.1002/bip.1975.360140814] [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: 12/13/2022]
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Dunn BM, Chaiken IM. Relationship between alpha-helical propensity and formation of the ribonuclease-S complex. J Mol Biol 1975; 95:497-511. [PMID: 1152063 DOI: 10.1016/0022-2836(75)90313-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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19
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Conio G, Trefiletti V, Bodria F, Troglia C, Patrone E. The effect of neutral salts on the conformational transition of poly-alpha-amino acids. I. Potentiometric titration and optical rotatory dispersion studies. Biopolymers 1974; 13:1483-98. [PMID: 4416204 DOI: 10.1002/bip.1974.360130717] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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20
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Chou PY, Fasman GD. Conformational parameters for amino acids in helical, beta-sheet, and random coil regions calculated from proteins. Biochemistry 1974; 13:211-22. [PMID: 4358939 DOI: 10.1021/bi00699a001] [Citation(s) in RCA: 1637] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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21
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Rao SP, Miller WG. Effect of residual side chain blocking groups and side chain charge on polypeptide conformation in aqueous solution. Biopolymers 1973; 12:835-43. [PMID: 4695678 DOI: 10.1002/bip.1973.360120412] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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22
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Sequence peptide polymers: Part 2. Poly(leucyl-leucyl-aspartic acid)—Conformational aspects in water solution. POLYMER 1972. [DOI: 10.1016/0032-3861(72)90068-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lewin S. Probabilities of formation of -helices in poly-L-glutamic acid and in poly-L-aspartic acid. J Theor Biol 1972; 36:1-7. [PMID: 5070902 DOI: 10.1016/0022-5193(72)90172-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Senior MB, Gorrell SL, Hamori E. Light-scattering and potentiometric-titration studies of poly-L-tyrosine in aqueous solution. Biopolymers 1971; 10:2387-404. [PMID: 5126514 DOI: 10.1002/bip.360101204] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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26
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Bychkova VE, Ptitsyn OB, Barskaya TV. Thermodynamic parameters of helix-coil transition in polypeptide chains. I. Poly-(L-glutamic acid). Biopolymers 1971; 10:2161-79. [PMID: 5118649 DOI: 10.1002/bip.360101111] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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27
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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]
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Ostroy SE, Lotan N, Ingwall RT, Scheraga HA. Effect of side-chain hydrophobic bonding on the stability of homopolyamino acid alpha-helices: conformational studies of poly-l-leucine in water. Biopolymers 1970; 9:749-64. [PMID: 5424504 DOI: 10.1002/bip.1970.360090702] [Citation(s) in RCA: 43] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Ikeda S. Hydrogen Ion Titration of Poly-S-carboxymethyl-L-cysteine. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1970. [DOI: 10.1246/bcsj.43.1686] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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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]
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Ptitsyn OB. Statistical analysis of the distribution of amino acid residues among helical and non-helical regions in globular proteins. J Mol Biol 1969; 42:501-10. [PMID: 5804157 DOI: 10.1016/0022-2836(69)90238-1] [Citation(s) in RCA: 76] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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35
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Ciferri A, Puett D, Rajagh L, Hermans J. Potentiometric titrations and the helix-coil transition of poly(L-glutamic acid) and poly-L-lysine in aqueous salt solutions. Biopolymers 1968; 6:119-36. [PMID: 5663413 DOI: 10.1002/bip.1968.360060803] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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36
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Ingwall RT, Scheraga HA, Lotan N, Berger A, Katchalski E. Conformational studies of poly-L-alanine in water. Biopolymers 1968; 6:331-68. [PMID: 5641934 DOI: 10.1002/bip.1968.360060308] [Citation(s) in RCA: 140] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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37
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Morita K, Simons ER, Blout ER. Polypeptides. LVI. Effect of lithium bromide and of temperature on the conformation of a copolymer of glutamic acid and lysine. Biopolymers 1968; 6:181-8. [PMID: 5644148 DOI: 10.1002/bip.1968.360060203] [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: 01/16/2023]
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38
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Miller WG, Monroe J. Enzymic hydrolysis of synthetic polypeptides under high helical content. Biochemistry 1968; 7:253-61. [PMID: 5758546 DOI: 10.1021/bi00841a030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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39
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Nekrasova T, Gabrielyan A, Ptitsyn O. Determination of the thermodynamic characteristics of the conformational transition in polymethacrylic acid from potentiometric titration curves. ACTA ACUST UNITED AC 1968. [DOI: 10.1016/0032-3950(68)90046-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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40
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Gratzer WB, Beaven GH, Rattle HW, Bradbury EM. A conformational study of glucagon. EUROPEAN JOURNAL OF BIOCHEMISTRY 1968; 3:276-83. [PMID: 5645524 DOI: 10.1111/j.1432-1033.1968.tb19527.x] [Citation(s) in RCA: 102] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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41
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Morita K, Simons ER, Blout ER. Polypeptides. 53. Water-soluble copolypeptides of L-glutamic acid, L-lysine, and L-alanine. Biopolymers 1967; 5:259-71. [PMID: 6040032 DOI: 10.1002/bip.1967.360050304] [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: 01/18/2023]
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42
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Franzen JS, Harry JB, Bobik C. Stability of helical polyamino acids in solution at high temperatures. Biopolymers 1967; 5:193-202. [PMID: 6040717 DOI: 10.1002/bip.1967.360050207] [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: 01/18/2023]
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