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Yang T, Xue T, Mao J, Chen Y, Tian H, Bartolome A, Xia H, Yao X, Kumar CV, Cheng J, Lin Y. Tailoring Synthetic Polypeptide Design for Directed Fibril Superstructure Formation and Enhanced Hydrogel Properties. J Am Chem Soc 2024; 146:5823-5833. [PMID: 38174701 DOI: 10.1021/jacs.3c10762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
The biological significance of self-assembled protein filament networks and their unique mechanical properties have sparked interest in the development of synthetic filament networks that mimic these attributes. Building on the recent advancement of autoaccelerated ring-opening polymerization of amino acid N-carboxyanhydrides (NCAs), this study strategically explores a series of random copolymers comprising multiple amino acids, aiming to elucidate the core principles governing gelation pathways of these purpose-designed copolypeptides. Utilizing glutamate (Glu) as the primary component of copolypeptides, two targeted pathways were pursued: first, achieving a fast fibrillation rate with lower interaction potential using serine (Ser) as a comonomer, facilitating the creation of homogeneous fibril networks; and second, creating more rigid networks of fibril clusters by incorporating alanine (Ala) and valine (Val) as comonomers. The selection of amino acids played a pivotal role in steering both the morphology of fibril superstructures and their assembly kinetics, subsequently determining their potential to form sample-spanning networks. Importantly, the viscoelastic properties of the resulting supramolecular hydrogels can be tailored according to the specific copolypeptide composition through modulations in filament densities and lengths. The findings enhance our understanding of directed self-assembly in high molecular weight synthetic copolypeptides, offering valuable insights for the development of synthetic fibrous networks and biomimetic supramolecular materials with custom-designed properties.
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Affiliation(s)
- Tianjian Yang
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Tianrui Xue
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jianan Mao
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Yingying Chen
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Huidi Tian
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Arlene Bartolome
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Hongwei Xia
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Xudong Yao
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Challa V Kumar
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Jianjun Cheng
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Yao Lin
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
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Di Foggia M, Boga C, Micheletti G, Nocentini B, Taddei P. Vibrational Raman and IR data on brown hair subjected to bleaching. Data Brief 2021; 38:107439. [PMID: 34660859 PMCID: PMC8502914 DOI: 10.1016/j.dib.2021.107439] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/23/2021] [Accepted: 09/28/2021] [Indexed: 11/23/2022] Open
Abstract
Brown human hair was bleached three times (45 min × 3) and four times (45 min × 3 + 15 min) with commercial formulations containing persulfate salts and hydrogen peroxide. The hair samples were characterized by Raman and IR spectroscopy in the Attenuated Total Reflectance (ATR) mode to gain more insights into the possible secondary structure and Cα-Cβ-S-S-Cβ-Cα conformational changes induced by bleaching. The latter were evaluated through band-fitting procedures; the relative content of the disulfide bridges and oxidized sulfur species (cysteic acid, Bunte salt, cystine oxides) was assessed. The observed conformational changes could be significant in developing restoring agents to be used after hair decoloration. The use of two different spectroscopic techniques allowed to discriminate the information coming from the cortical region of hair (Raman) and the cuticle (ATR/IR). This article refers to “Structural investigation on damaged hair keratin treated with α,β-unsaturated Michael acceptors used as repairing agents” (Di Foggia et al., Int. J. Biol. Macromol. 167 (2021) 620–632 https://doi.org/10.1016/j.ijbiomac.2020.11.194).
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Affiliation(s)
- Michele Di Foggia
- Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum – Università di Bologna, Via Belmeloro 8/2, Bologna 40126, Italy
| | - Carla Boga
- Department of Industrial Chemistry ‘Toso Montanari’, Alma Mater Studiorum – Università di Bologna, Viale Del Risorgimento 4, Bologna 40136, Italy
| | - Gabriele Micheletti
- Department of Industrial Chemistry ‘Toso Montanari’, Alma Mater Studiorum – Università di Bologna, Viale Del Risorgimento 4, Bologna 40136, Italy
| | - Benedetta Nocentini
- Department of Industrial Chemistry ‘Toso Montanari’, Alma Mater Studiorum – Università di Bologna, Viale Del Risorgimento 4, Bologna 40136, Italy
| | - Paola Taddei
- Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum – Università di Bologna, Via Belmeloro 8/2, Bologna 40126, Italy
- Corresponding author.
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Pavoni E, Tozzi S, Tsukada M, Taddei P. Structural study on methacrylamide-grafted Tussah silk fibroin fibres. Int J Biol Macromol 2016; 88:196-205. [DOI: 10.1016/j.ijbiomac.2016.03.057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 03/14/2016] [Accepted: 03/27/2016] [Indexed: 11/28/2022]
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Boga C, Taddei P, Micheletti G, Ascari F, Ballarin B, Morigi M, Galli S. Formaldehyde replacement with glyoxylic acid in semipermanent hair straightening: a new and multidisciplinary investigation. Int J Cosmet Sci 2014; 36:459-70. [PMID: 24962464 DOI: 10.1111/ics.12148] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 06/08/2014] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Formaldehyde is an effective and popular semipermanent hair straightener, but the severe consequences for human health due to its toxicity have prompted the search for safer alternatives. Different carbonyl compounds, including glyoxylic acid, have recently been proposed as promising candidates. Despite the interest in this topic, there is a lack of information about the interactions between hair keratin and straightener agents. This study addresses this issue to gain new insights useful in the development of new products for safe, semipermanent hair deformation. METHODS The possible reactions occurring between carbonyl groups and nucleophilic sites on amino acid residues belonging to the keratin were investigated using as model compounds some aldehydes and amino acid derivatives. Raman and IR analyses on yak hair subjected to the straightening treatment with glyoxylic acid in different conditions were carried out. Scanning electron microscope (SEM) analyses were carried out on yak and curly human hair after each step of the straightening procedure. RESULTS The reactions between aldehydes and N-α-acetyl-L-lysine revealed the importance of the carbonyl electrophilicity and temperature to form imines. Raman and IR analyses on yak hair subjected to the straightening treatment evidenced rearrangements in the secondary structure distribution, conformational changes to the disulphide bridges, a decrease of the serine residues and formation of imines. It was also indicated that straightening produced major conformational rearrangements within the hair fibre rather than on the cuticle. CONCLUSION This investigation revealed the role played by the electrophilicity of the carbonyl on the straightener agent and of the temperature, closely related to the dehydration process. Raman and IR studies indicated the involvement of imine bonds and the occurrence of a sequence of conformational modifications during the straightening procedure. SEM analyses showed the effectiveness of the treatment at the cuticular level.
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Affiliation(s)
- C Boga
- Department of Industrial Chemistry "Toso Montanari", Alma Mater Studiorum- University of Bologna, Viale del Risorgimento 4, 40136, Bologna, Italy
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Taddei P, Chiono V, Anghileri A, Vozzi G, Freddi G, Ciardelli G. Silk Fibroin/Gelatin Blend Films Crosslinked with Enzymes for Biomedical Applications. Macromol Biosci 2013; 13:1492-510. [DOI: 10.1002/mabi.201300156] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 06/11/2013] [Indexed: 01/31/2023]
Affiliation(s)
- Paola Taddei
- Dipartimento di Scienze Biomediche e Neuromotorie; Università di Bologna Via Belmeloro 8/2; Bologna I-40126 Italy
| | - Valeria Chiono
- Department of Mechanical and Aerospace Engineering; Politecnico di Torino; Corso Duca degli Abruzzi 24 10129 Torino Italy
| | - Anna Anghileri
- Innovhub - Stazioni Sperimentali per l'Industria; Div. Stazione Sperimentale per la Seta; Via G. Colombo 83 20133 Milano Italy
| | - Giovanni Vozzi
- Research Center “E. Piaggio”; University of Pisa; Largo Lucio Lazzarino 2 56126 Pisa Italy
- Dipartimento di Ingegneria dell'Informazione; University of Pisa; Via Caruso 1 56126 Pisa Italy
| | - Giuliano Freddi
- Innovhub - Stazioni Sperimentali per l'Industria; Div. Stazione Sperimentale per la Seta; Via G. Colombo 83 20133 Milano Italy
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering; Politecnico di Torino; Corso Duca degli Abruzzi 24 10129 Torino Italy
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Luo X, Wu J, Intisar A, Geng J, Wu L, Zheng K, Du Y. Study on Light Aging of Silk Fabric by Fourier Transform Infrared Spectroscopy and Principal Component Analysis. ANAL LETT 2012. [DOI: 10.1080/00032719.2012.673098] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Lefèvre T, Boudreault S, Cloutier C, Pézolet M. Diversity of Molecular Transformations Involved in the Formation of Spider Silks. J Mol Biol 2011; 405:238-53. [DOI: 10.1016/j.jmb.2010.10.052] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 10/26/2010] [Accepted: 10/27/2010] [Indexed: 11/28/2022]
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Toniolo C, Bonora GM, Fontana A. Three-dimensional architecture of monodisperse beta-branched linear homo-oligopeptides. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 2009; 6:371-80. [PMID: 4455634 DOI: 10.1111/j.1399-3011.1974.tb02398.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Monti P, Freddi G, Arosio C, Tsukada M, Arai T, Taddei P. Vibrational spectroscopic study of sulphated silk proteins. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.11.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gupta A, Tandon P, Gupta VD, Rastogi S, Gupta GP. Phonon dispersion and specific heat in ω-helical poly-N∊(p-bromobenzoyl-l-ornithine). J MACROMOL SCI B 2006. [DOI: 10.1080/00222349508219501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Archana Gupta
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - Poonam Tandon
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - V. D. Gupta
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - Shantanu Rastogi
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - G. P. Gupta
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
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Bahuguna GP, Tandon P, Gupta VD, Rastogi S, Mehrotra C. Vibrational dynamics of poly(L-tyrosine). J MACROMOL SCI B 2006. [DOI: 10.1080/00222349708220440] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- G. P. Bahuguna
- a Lucknow Christian Degree College , Lucknow, 226 018, India
| | - P. Tandon
- b Physics Department , Lucknow University , Lucknow, 226 007, India
| | - V. D. Gupta
- b Physics Department , Lucknow University , Lucknow, 226 007, India
| | - S. Rastogi
- b Physics Department , Lucknow University , Lucknow, 226 007, India
| | - C. Mehrotra
- b Physics Department , Lucknow University , Lucknow, 226 007, India
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Burman L, Tandon P, Gupta VD, Srivastava S. Heat capacity and phonons in ω-helical poly-l-phenylalanine. J MACROMOL SCI B 2006. [DOI: 10.1080/00222349508219500] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Leena Burman
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - Poonam Tandon
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - V. D. Gupta
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
| | - Seema Srivastava
- a Physics Department , University of Lucknow , Lucknow, 226 007, India
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van Hooy-Corstjens CSJ, Rastogi S. Molecular blending by polymerization of intercalated solvent. Poly(gamma-benzyl-L-glutamate)/benzyl methacrylate as a model system. Biomacromolecules 2006; 7:1542-50. [PMID: 16677037 DOI: 10.1021/bm050817q] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of the present research is to obtain blending between a polymer and a (polymerized) solvent on the molecular level. Because of its rigid rod structure, poly(gamma-benzyl-L-glutamate) (PBLG) is chosen as the polymer. Benzyl methacrylate (BzMA) has been chosen as the solvent for two reasons. First, the structure of the solvent is very similar to the structure of the side chain of PBLG, favoring interactions between the two materials. Second, the solvent can be polymerized, because of the presence of a C=C bond. In cast films of PBLG and BzMA separate zones of the polymer and solvent are present. Wide-angle X-ray diffraction and Raman results show that upon heating the cast films homogenization occurs and solvent molecules intercalate between the helices of PBLG. At 150 degrees C a hexagonal packing is obtained. The dimensions of the obtained packing depend on the solvent concentration, which confirms that solvent molecules are indeed present within the crystalline lattice. DSC experiments imply that the observed changes upon heating correspond to thermodynamic processes. On cooling the homogeneous samples, disordering of the hexagonal packing occurs. Polymerization of the homogeneous samples results in a disordering of the hexagonal packing and in a contraction of the unit cell. The latter once more confirms that solvent molecules are indeed present within the crystalline lattice. The applied principle of polymerization of a solvent in a molecular homogeneous system can be favorable for many applications, for which morphology control at the molecular level is required.
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Pandiarajan S, Umadevi M, Rajaram RK, Ramakrishnan V. Infrared and Raman spectroscopic studies of l-valine l-valinium perchlorate monohydrate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 62:630-6. [PMID: 16257768 DOI: 10.1016/j.saa.2005.02.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2005] [Revised: 02/12/2005] [Accepted: 02/14/2005] [Indexed: 05/05/2023]
Abstract
FT-IR and FT-Raman spectra were recorded and analyzed for l-valine l-valinium perchlorate monohydrate crystals. The wave number assignments have been made for the functional groups, viz. COOH, COO(-), --[NH(3)](+), C--(CH(3))(2), C--C--N and C--H. One of the two amino acid residues remains in the zwitterionic form while the other residue exists in the cationic form. The symmetry of the ClO(4)(-) anion has been found to be lowered corresponding to ClO(2) group. The hydrogen bonds that prevail between amino acid residues, perchlorate anion and water molecule influence the wave numbers of several stretching and deformation modes to deviate from the expected values.
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Affiliation(s)
- S Pandiarajan
- Laser Laboratory, Department of Microprocessor and Computer, School of Physics, Madurai Kamaraj University, Madurai 625021, India.
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Taddei P, Monti P. Vibrational infrared conformational studies of model peptides representing the semicrystalline domains of Bombyx mori silk fibroin. Biopolymers 2005; 78:249-58. [PMID: 15800959 DOI: 10.1002/bip.20275] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The structural organization of Bombyx mori silk fibroin was investigated by infrared (IR) spectroscopy. To this aim, (AG)15 and other model peptides of varying chain length, containing tyrosine (Y), valine (V), and serine (S) in the basic (AG)n sequence were synthesized by the solid phase method and their spectroscopic properties were determined. Both the position and the relative content of Y, V, and S residues in the (AG)n model system appeared critical in determining the preferred conformation, i.e., silk I, silk II, and unordered structures. Curve fitting analysis in the amide I range showed that the model peptides with prevailing silk II structure displayed different beta-sheet content, which was dependent on the degree of interruption of the (AG)n sequence. In this regard, the bands at about 1000 and 980 cm(-1), specifically assigned to the AG sequence of the B. mori silk fibroin chain, were identified as marker of the degree of interruption of the (AG)n sequence.A stable silk I structure was observed only when the Y residue was located near the chain terminus, while a silk I --> silk II conformational transition occurred when it was positioned in the central region of the peptide. Analysis of the second-derivative spectra in the amide I range allowed us to identify a band at 1639 cm(-1) (4 --> 1 hydrogen-bonded type II beta-turns), which is characteristic of the silk I conformation.
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Affiliation(s)
- Paola Taddei
- Dipartimento di Biochimica G. Moruzzi, Sezione di Chimica e Propedeutica Biochimica, Centro di Studio sulla Spettroscopia Raman, Università di Bologna, Via Belmeloro 8/2, 40126 Bologna, Italy.
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Kapoor D, Misra NK, Kumar A, Tandon P, Munoz-Guerra S, Gupta VD. Normal modes and their dispersion in poly(α-isobutyl, β-l-aspartate). Eur Polym J 2001. [DOI: 10.1016/s0014-3057(00)00187-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shao Z, Vollrath F, Sirichaisit J, Young R. Analysis of spider silk in native and supercontracted states using Raman spectroscopy. POLYMER 1999. [DOI: 10.1016/s0032-3861(98)00475-3] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Shao Z, Young RJ, Vollrath F. The effect of solvents on spider silk studied by mechanical testing and single-fibre Raman spectroscopy. Int J Biol Macromol 1999; 24:295-300. [PMID: 10342778 DOI: 10.1016/s0141-8130(98)00093-2] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We used well-defined, fluorescence-free Raman spectra of single silk fibres to study silk ultrastructure. Major ampullate (MA) silk was reeled from the Araneus diadematus spider under controlled conditions. With a custom-built stress-strain gauge, we examined the mechanical properties of this silk both before and after supercontraction in a range of solvents. The solvents were found to modify the material properties considerably. We suggest that the solvents with their different polarities affect different regions of the silk's composite microstructure, in particular the conformation of the molecular chains.
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Affiliation(s)
- Z Shao
- Department of Zoology, Aarhus University, Aarhus C, Denmark
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Srivastava S, Tandon P, Gupta VD, Rastogi S, Mehrotra C. Heat Capacity and Vibrational Dynamics of Poly(L-glutamic acid) (α Helix). Polym J 1997. [DOI: 10.1295/polymj.29.33] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Burman L, Tandon P, Gupta VD, Rastogi S. Conformational Study of α Poly(L-valine). A Vibrational Approach. Polym J 1996. [DOI: 10.1295/polymj.28.474] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Prasad O, Tandon P, Gupta VD, Rastogi S, Katti SB. Normal Modes and Their Dispersion in α Poly(β-benzyl-L-aspartate). Polym J 1996. [DOI: 10.1295/polymj.28.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Burman L, Tandon P, Gupta VD, Rastogi S, Srivastava S. Heat capacity and normal modes of poly (L-valine) in relation to spectra of oligovalines. Biopolymers 1996. [DOI: 10.1002/(sici)1097-0282(199601)38:1<53::aid-bip5>3.0.co;2-v] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Burman L, Tandon P, Gupta VD, Rastogi S, Srivastava S. Normal Modes of Poly(L-valine) in Relation to Spectra of Oligovalines. Polym J 1995. [DOI: 10.1295/polymj.27.481] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Malon P, Kobrinskaya R, Keiderling TA. Vibrational CD of polypeptides. XII. Reevaluation of the Fourier transform vibrational CD of poly(gamma-benzyl-L-glutamate). Biopolymers 1988; 27:733-46. [PMID: 2454680 DOI: 10.1002/bip.360270503] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Liedberg B, Ivarsson B, Hegg PO, Lundström I. On the adsorption of β-lactoglobulin on hydrophilic gold surfaces: Studies by infrared reflection-absorption spectroscopy and ellipsometry. J Colloid Interface Sci 1986. [DOI: 10.1016/0021-9797(86)90424-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Renugopalakrishnan V, Strawich ES, Horowitz PM, Glimcher MJ. Studies of the secondary structures of amelogenin from bovine tooth enamel. Biochemistry 1986; 25:4879-87. [PMID: 3768319 DOI: 10.1021/bi00365a023] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Circular dichroism and Fourier transform infrared spectroscopic studies of the major amelogenin protein of developing bovine tooth enamel in solution and in the solid state suggest a unique secondary structure containing beta-sheet and repetitive beta-turn structures. The repetitive beta-turn structure at the C-terminal end results from the unique primary structure of amelogenin.
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Krimm S, Bandekar J. Vibrational spectroscopy and conformation of peptides, polypeptides, and proteins. ADVANCES IN PROTEIN CHEMISTRY 1986; 38:181-364. [PMID: 3541539 DOI: 10.1016/s0065-3233(08)60528-8] [Citation(s) in RCA: 1966] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Renugopalakrishnan V, Horowitz PM, Glimcher MJ. Structural studies of phosvitin in solution and in the solid state. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)39041-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Sengupta PK, Krimm S. Vibrational analysis of peptides, polypeptides, and proteins. XXXII. alpha-Poly(L-glutamic acid). Biopolymers 1985; 24:1479-91. [PMID: 2412608 DOI: 10.1002/bip.360240805] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Sengupta P, Krimm S. Raman and normal mode studies of the polypeptide chain conformations in crystalline magnesium and calcium poly(l-glutamate)s. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0584-8539(85)80098-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Thomas GJ, Prescott B, Day LA. Structure similarity, difference and variability in the filamentous viruses fd, If1, IKe, Pf1 and Xf. Investigation by laser Raman spectroscopy. J Mol Biol 1983; 165:321-56. [PMID: 6405045 DOI: 10.1016/s0022-2836(83)80260-5] [Citation(s) in RCA: 116] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The filamentous bacteriophages fd, If1, IKe, Pf1, Xf and Pf3 in aqueous solutions of low, moderate and high ionic strength have been investigated as a function of temperature by laser Raman difference spectroscopy. By analogy with Raman spectra of model compounds and viruses of known structure, the data reveal the following structural features: the predominant secondary structure of the coat protein subunit in each virus is the alpha-helix, but the amount of alpha-helix differs from one virus to another, ranging from an estimated high of 100% in Pf1 to a low of approximately 50% in Xf. The molecular environment and intermolecular interactions of tyrosine, tryptophan and phenylalanine residues differ among the different viruses, as do the conformations of aliphatic amino acid side-chains. The foregoing features of coat protein structure are highly sensitive to changes in Na+ concentration, temperature or both. The backbones of A-DNA and B-DNA structures do not occur in any of the viruses, and unusual DNA structures are indicated for all six viruses. The alpha-helical protein subunits of Pf1, like those of Pf3 and Xf, can undergo reversible transitions to beta-sheet structures while retaining their association with DNA; yet fd, IKe and If1 do not undergo such transitions. Raman intensity changes with ionic strength or temperature suggest that transgauche rotations of aliphatic amino acid side-chains and stacking of aromatic side-chains are important structural variables in each virus.
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Lal BB, Nafie LA. Vibrational circular dichroism in amino acids and peptides. 7. Amide stretching vibrations in polypeptides. Biopolymers 1982; 21:2161-83. [PMID: 7171731 DOI: 10.1002/bip.360211106] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Hamodrakas SJ, Asher SA, Mazur GD, Regier JC, Kafatos FC. Laser Raman studies of protein conformation in the silkmoth chorion. BIOCHIMICA ET BIOPHYSICA ACTA 1982; 703:216-22. [PMID: 7082682 DOI: 10.1016/0167-4838(82)90051-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Kitagawa T, Azuma T, Hamaguchi K. The Raman spectra of Bence-Jones proteins. Disulfide stretching frequencies and dependence of Raman intensity of tryptophan residues on their environments. Biopolymers 1979. [DOI: 10.1002/bip.1979.360180218] [Citation(s) in RCA: 86] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Fasman GD, Itoh K, Liu CS, Lord RC. Laser-Raman spectroscopy of biomolecules. XI. Conformational study of poly(L-valine) and copolymers ofL-valine andL-alanine. Biopolymers 1978. [DOI: 10.1002/bip.1978.360170110] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Shepherd IW. Study of poly-L-lysine conformations in aqueous methanol solution by using polarized Raman techniques. Biochem J 1976; 155:543-8. [PMID: 949317 PMCID: PMC1172876 DOI: 10.1042/bj1550543] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Raman polarization measurements of the amide I band are reported in ionized poly-L-lysine dissolved in aqueous methanol. The observed changes with methanol concentration, attributed to changes in coil conformation and to the helix-coil transition, represent a novel method of measuring polymer conformation. Polarization measurements as a function of temperature yield values of the energy differences between rotational isomeric states in the coil. deltaH, of 8.8 +/- 0.7, 10.4 +/- 1.1 and 10.8 +/- 1.5 kJ/mol at methanol concentrations (v/v) of 85, 80 and 70% respectively. The stabilization energy of the helix is estimated at 9.3 kJ/mol.
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Chirgadze YN, Nevskaya NA. Infrared spectra and resonance interaction of amide-I vibration of the antiparallel-chain pleated sheet. Biopolymers 1976; 15:607-25. [PMID: 1252597 DOI: 10.1002/bip.1976.360150402] [Citation(s) in RCA: 213] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Frushour BG, Koenig JL. Raman spectroscopic study of poly (?-benzyl-L-aspartate) and sequential polypeptides. Biopolymers 1975. [DOI: 10.1002/bip.1975.360141011] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ito K, Fasman GD. Poly(L-valine). Conformational dependence on the degree of polymerization: infrared studies. Biopolymers 1975; 14:1755-67. [PMID: 1156663 DOI: 10.1002/bip.1975.360140815] [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: 12/25/2022]
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Verma SP, Wallach DF, Schmidt-Ullrich R. The structure and thermotropism of thymocyte plasma membranes as revealed by laser-raman spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 394:633-45. [PMID: 1148234 DOI: 10.1016/0005-2736(75)90148-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
1. Plasma membranes from rabbit thymocytes have been analyzed by laser-Raman spectroscopy over the 800-3000 cm-1 region and the spectra compared with those of endoplasmic reticulum, as well as relevant liposome systems. 2. Evaluation of the Amide I and Amide III regions indicates that thymocyte plasma membranes, but not endoplasmic reticulum, contain appreciable beta-structure peptide. This conclusion is supported by infrared spectroscopy. 3. Evaluation of the 2890 cm-1: 2850 cm-1 intensity ratio of plasma membranes as a function of temperature, using an integration technique, demonstrates a thermotropic lipid transition centered near 23 degrees C. This transition is less sharp than one observed with egg lecithin in this temperature range. 4. The significance of the thermotropic transition is evaluated in view of the lack of thermotropic lipid-protein segregation detectable by freeze-fracture electron microscopy (Wunderlich, F., Wallach, D.F.H., Speth, V. and Fischer, H. (1973) Biochim. Biophys. Acta 373, 34-43).
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Yamashita S, Yamashita T. Conformation of high-molecular-weight poly(L-valine) in solid state. Proc Natl Acad Sci U S A 1975; 72:941-2. [PMID: 1055391 PMCID: PMC432438 DOI: 10.1073/pnas.72.3.941] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Poly(L-valine) in various degrees of polymerization was prepared from the N-carboxyanhydride of L-valine. The high-molecular-weight polymer was fibrous and capable of forming an oriented film when cast from trifluoroacetic acid solution. The comformations were examined by Raman spectroscopy. The Raman and infrared spectra of high-molecular-weight polymer were quite different from those of low-molecular-weight and tri-fluoroacetic-acid-treated high-molecular-weight polymers. The spectral data in the amide A, I, II, III, and V regions indicated that high-molecular-weight poly(L-valine) is possibly in the alpha-helical conformation, while low-molecular-weight poly(L-valine) and high--molecular-weight poly(L-valine) treated with trifluoroacetic acid are in the beta-conformation.
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Synthesis, characterization, and conformational studies of N-t-butyloxycarbonyl-oligo-l-leucine methyl esters. POLYMER 1974. [DOI: 10.1016/0032-3861(74)90135-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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