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Puiggalí J. Aliphatic polyamides (nylons): Interplay between hydrogen bonds and crystalline structures, polymorphic transitions and crystallization. POLYMER CRYSTALLIZATION 2021. [DOI: 10.1002/pcr2.10199] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jordi Puiggalí
- Departament d'Enginyeria Química Universitat Politècnica de Catalunya, Escola d'Enginyeria de Barcelona Est‐EEBE Barcelona
- Barcelona Research Center in Multiscale Science and Engineering Universitat Politècnica de Catalunya, c/ Eduard Maristany, 10‐14, Ed. I2 Barcelona
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2
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Mazumdar PA, Das AK, Bertolasi V, Kundu SK, Pramanik A. A Folded Conformation around the Methylene Group in Simple Boc–NH–(CH2)3–NH–Boc: An X-ray Diffraction Study. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823402103171104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Structural studies on model compounds Boc–NH–(CH2)2–NH–Boc (1) and Boc–NH–(CH2)3–NH–Boc (2) have shown the inherent tendency of the propylene group to adopt a folded conformation, which may help in peptide and peptide nucleic acid (PNA) design.
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Affiliation(s)
- Pooja Anjali Mazumdar
- Department of Biotechnology, Indian Institute of Technology, Kharagpur 721302, India
| | - Amit Kumar Das
- Department of Biotechnology, Indian Institute of Technology, Kharagpur 721302, India
| | - Valerio Bertolasi
- Dipartimento di Chimica and Centro di Strutturistica Diffrattometrica, Universitá di Ferrara, Via L. Borsari 46, 44100 Ferrara, Italy
| | - Sandip Kumar Kundu
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
| | - Animesh Pramanik
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
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Wang JL, Xu JS, Wang DY, Wang H, Li ZT, Zhang DW. Anti-parallel sheet structures of side-chain-free γ-, δ-, and ε-dipeptides stabilized by benzene–pentafluorobenzene stacking. CrystEngComm 2014. [DOI: 10.1039/c3ce42060d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Benzene–pentafluorobenzene stacking can guide ω-amino acid dipeptides to arrange in an anti-parallel manner.
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Affiliation(s)
- Ji-Liang Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Jia-Su Xu
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Dong-Yun Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Hui Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Zhan-Ting Li
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Dan-Wei Zhang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
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4
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Kameta N, Masuda M, Mizuno G, Morii N, Shimizu T. Supramolecular nanotube endo sensing for a guest protein. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:561-5. [PMID: 18384039 DOI: 10.1002/smll.200700710] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Naohiro Kameta
- SORST, Japan Science and Technology Agency (JST) Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
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5
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Houk KN, Jabbari A, Hall HK, Alemán C. Why δ-Valerolactone Polymerizes and γ-Butyrolactone Does Not. J Org Chem 2008; 73:2674-8. [DOI: 10.1021/jo702567v] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024-1569, Department of Chemistry, The University of Arizona, Tucson, Arizona, 85721, and Department d'Enginyeria Química, E.T.S. de'Enginyera Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 547 Barcelona E-08028 Spain
| | - Arash Jabbari
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024-1569, Department of Chemistry, The University of Arizona, Tucson, Arizona, 85721, and Department d'Enginyeria Química, E.T.S. de'Enginyera Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 547 Barcelona E-08028 Spain
| | - H. K. Hall
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024-1569, Department of Chemistry, The University of Arizona, Tucson, Arizona, 85721, and Department d'Enginyeria Química, E.T.S. de'Enginyera Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 547 Barcelona E-08028 Spain
| | - Carlos Alemán
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024-1569, Department of Chemistry, The University of Arizona, Tucson, Arizona, 85721, and Department d'Enginyeria Química, E.T.S. de'Enginyera Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 547 Barcelona E-08028 Spain
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6
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Darnell G, Orgel JPRO, Pahl R, Meredith SC. Flanking polyproline sequences inhibit beta-sheet structure in polyglutamine segments by inducing PPII-like helix structure. J Mol Biol 2007; 374:688-704. [PMID: 17945257 DOI: 10.1016/j.jmb.2007.09.023] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2007] [Revised: 09/05/2007] [Accepted: 09/07/2007] [Indexed: 10/22/2022]
Abstract
Polyglutamine (poly(Q)) expansion is associated with protein aggregation into beta-sheet amyloid fibrils and neuronal cytotoxicity. In the mutant poly(Q) protein huntingtin, associated with Huntington's disease, both aggregation and cytotoxicity may be abrogated by a polyproline (poly(P)) domain flanking the C terminus of the poly(Q) region. To understand structural changes that may occur with the addition of the poly(P) sequence, we synthesized poly(Q) peptides with 3-15 glutamine residues and a corresponding set of poly(Q) peptides flanked on the C terminus by 11 proline residues (poly(Q)-poly(P)), as occurs in the huntingtin sequence. The shorter soluble poly(Q) peptides (three or six glutamine residues) showed polyproline type II-like (PPII)-like helix conformation when examined by circular dichroism spectroscopy and were monomers as judged by size-exclusion chromatography (SEC), while the longer poly(Q) peptides (nine or 15 glutamine residues) showed a beta-sheet conformation by CD and defined oligomers by SEC. Soluble poly(Q)-poly(P) peptides showed PPII-like content but SEC showed poorly defined, overlapping oligomeric peaks, and as judged by CD these peptides retained significant PPII-like structure with increasing poly(Q) length. More importantly, addition of the poly(P) domain increased the threshold for fibril formation to approximately 15 glutamine residues. X-ray diffraction, electron microscopy, and film CD showed that, while poly(Q) peptides with >or=6 glutamine residues formed beta-sheet-rich fibrils, only the longest poly(Q)-poly(P) peptide (15 glutamine residues) did so. From these and other observations, we propose that poly(Q) domains exist in a "tug-of-war" between two conformations, a PPII-like helix and a beta-sheet, while the poly(P) domain is conformationally constrained into a proline type II helix (PPII). Addition of poly(P) to the C terminus of a poly(Q) domain induces a PPII-like structure, which opposes the aggregation-prone beta-sheet. These structural observations may shed light on the threshold phenomenon of poly(Q) aggregation, and support the hypothesized evolution of "protective" poly(P) tracts adjacent to poly(Q) aggregation domains.
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Affiliation(s)
- Gregory Darnell
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA
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8
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Kameta N, Mizuno G, Masuda M, Minamikawa H, Kogiso M, Shimizu T. Molecular Monolayer Nanotubes Having 7–9 nm Inner Diameters Covered with Different Inner and Outer Surfaces. CHEM LETT 2007. [DOI: 10.1246/cl.2007.896] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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Belova NV, Oberhammer H, Girichev GV, Shlykov SA. Tautomeric and Conformational Properties of Malonamide, NH2C(O)−CH2−C(O)NH2: Electron Diffraction and Quantum Chemical Study. J Phys Chem A 2007; 111:2248-52. [PMID: 17388304 DOI: 10.1021/jp0686801] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The geometric structure of malonamide, NH2C(O)-CH2-C(O)NH2, has been investigated by gas electron diffraction (GED) and quantum chemical calculations (B3LYP and MP2 approximations with 6-311++G(3df,pd) basis sets). Both GED and quantum chemistry result in the existence of a single diketo conformer in the gas phase. According to GED refinement this conformer possesses (sc,ac) conformation with one C=O bond in synclinal orientation (dihedral angle tau(O=C-C-C)=49.0(3.0) degrees) and the other C=O bond in anticlinal orientation (dihedral angle tau(O=C-C-C)=139.5(3.3) degrees). The experimental geometric parameters are reproduced very closely by the B3LYP method.
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Affiliation(s)
- Natalya V Belova
- Ivanovo State University of Chemistry and Technology, Ivanovo 153460, Russia.
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10
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Kogiso M, Masuda M, Shimizu T. Supramolecular Polyglycine II-Type Structure of Glycylglycine Bolaamphiphile. Supramol Chem 2006. [DOI: 10.1080/10610279808034985] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Masaki Kogiso
- a Department of Organic Materials , National Institute of Materials and Chemical Research , 1-1 Higashi, Tsukuba, Ibaraki , 305 , Japan
| | - Mitsutoshi Masuda
- a Department of Organic Materials , National Institute of Materials and Chemical Research , 1-1 Higashi, Tsukuba, Ibaraki , 305 , Japan
| | - Toshimi Shimizu
- a Department of Organic Materials , National Institute of Materials and Chemical Research , 1-1 Higashi, Tsukuba, Ibaraki , 305 , Japan
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11
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Alemán C, Casanovas J, Hall HK. Systematic Evaluation of the Conformational Properties of Aliphatic ω-Methoxy Methyl Esters. J Org Chem 2005; 70:7731-6. [PMID: 16149806 DOI: 10.1021/jo051167j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[structure: see text] A systematic conformational study of omega-methoxy methyl esters, CH(3)O-(CH2)n-COO-CH3 with n = 3 and 4, has been performed using quantum mechanical calculations at the MP2 level. Calculations have been carried out in both gas phase and chloroform solution, a polarizable continuum solvation model being used to represent the latter. Results have been compared with those recently obtained for the analogues omega-hydroxy acids, HO-(CH2)n-COOH with n = 3 and 4. The compounds with n = 3 clearly favor coiled conformations, the population expected for extended and semiextended conformations being very low. However, for compounds with n = 4 the minimum energy extended and semiextended structures become considerably more stable. The overall results indicate that the conformational preferences of the central aliphatic segment of omega-methoxy methyl esters and omega-hydroxy acids are not influenced by the formation of intramolecular O-H...O hydrogen bonds.
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Affiliation(s)
- Carlos Alemán
- Departament d'Enginyeria Química, E.T.S. d'Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain.
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12
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Alemán C, Casanovas J, Zanuy D, Hall HK. Systematic Evaluation of the Conformational Properties of Aliphatic ω-Hydroxy Acids. J Org Chem 2005; 70:2950-6. [PMID: 15822953 DOI: 10.1021/jo0478407] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A systematic conformational study of omega-hydroxy acids, HO-(CH(2))(n)()-COOH with n ranging from 2 to 5, has been performed using quantum mechanical calculations at the MP2 level. To distinguish between intrinsic and environmentally induced conformational preferences, calculations have been carried out in both gas phase and chloroform solution, a polarizable continuum solvation model being used to represent the latter. Results indicate a consistent conformational behavior, as reflects the feature that the lowest energy minimum for n = 2, 3, 4, and 5 corresponds to the g+g-t, g+g+g-t, g-g+g+g-t, and g+g-g+g+g-t conformations, respectively. Furthermore, the stability of the extended and semi-extended conformations increases systematically with the size of the central aliphatic segment. The relationship between the size of the aliphatic segment and the stability of folded conformations is analyzed and discussed.
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Affiliation(s)
- Carlos Alemán
- Departament d'Enginyeria Química, E.T.S. d'Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain.
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Klipfel MW, Zamora MA, Rodriguez AM, Fidanza NG, Enriz RD, Csizmadia IG. Exploration of the Full Conformational Space of N-Acetyl-l-glutamine-N-methylamide. An ab Initio and Density Functional Theory Study. J Phys Chem A 2003. [DOI: 10.1021/jp030111v] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marco W. Klipfel
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
| | - Miguel A. Zamora
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
| | - Ana M. Rodriguez
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
| | - Noemí G. Fidanza
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
| | - Ricardo D. Enriz
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
| | - Imre G. Csizmadia
- Departamento de Química, Universidad Nacional de San Luis, Chacabuco 915, 5700 San Luis, Argentina, Area de Química Física, Departamento de Química, U.N.N.E., Av. Libertad 5460, 3400 Corrientes, Argentina, Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada, and Department of Medical Chemistry, University of Szeged, 8 Dom ter, H-6720 Szeged, Hungary
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14
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Shimizu T. Bottom-Up Synthesis and Morphological Control of High-Axial-Ratio Nanostructures through Molecular Self-Assembly. Polym J 2003. [DOI: 10.1295/polymj.35.1] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Carotti A, Carrieri A, Cellamare S, Fanizzi FP, Gavuzzo E, Mazza F. Extended form of a retro-inverso peptide stabilized by beta-sheet unidirectional H-bonds: Crystallographic and NMR evidence. Biopolymers 2002; 60:322-32. [PMID: 11774235 DOI: 10.1002/1097-0282(2001)60:4<322::aid-bip9993>3.0.co;2-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The crystallographic investigation of the retro-inverso peptide Bz-S-gAla-R-mAla-NHPh reveals an extended backbone conformation where the NH groups of the gem-diamino alkyl moiety and the CO groups of the malonyl residue face side by side. This extended conformation, presenting all carbonyls on opposite sides of the NH groups, is stabilized by interstrand H-bonds running in a single direction of the parallel beta-sheets that characterize the crystal packing. These sheets differ from the beta-sheets formed by native amino acids only. (1)H-NMR nuclear Overhauser effect spectroscopy (NOESY) experiments suggest that a conformation similar to that found in the crystal also prevails in dimethylsulfoxide solution. Previous potential energy calculations of gem-diamino alkyl (g) and malonyl (m) Ala residues predicted that extended forms were less stable than the helical ones because of strong electrostatic repulsions between the parallel polar groups. Similar arguments were invoked to give more weight to helical forms of the retro-peptide units in the proposal of packing models of some nylons in their crystalline polar regions. The present findings show that both g and m Ala residues can experience the extended conformation in the beta-sheet aggregation. The energy increase occurring in one strand, due to the parallel orientation of consecutive peptide dipoles, is more than compensated by favorable cooperative interactions among head-to-tail aligned peptide dipoles of facing strands, resulting in the formation of two C==O...H==N H-bonds per residue.
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Affiliation(s)
- A Carotti
- Dipartimento Farmaco-Chimico, Universitá degli Studi, V. E. Orabona 4, 70125 Bari, Italy
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16
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Alemán C, León S. Effects of electron correlation and the environment on the conformational preferences of the β-alanine dipeptide. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00376-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Vargas R, Garza J, Dixon DA, Hay BP. Conformational Analysis of N,N,N‘,N‘-Tetramethylsuccinamide: The Role of C−H···O Hydrogen Bonds. J Phys Chem A 2000. [DOI: 10.1021/jp000030o] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Conformational Analysis of Malonamide, N,N‘-Dimethylmalonamide, and N,N,N‘,N‘-Tetramethylmalonamide. J Phys Chem A 1999. [DOI: 10.1021/jp990029t] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Franco L, Subirana J, Puiggalı́ J. Incorporation of glycine residues in even–even polyamides. Part II: Nylons 6,10 and 12,10. POLYMER 1999. [DOI: 10.1016/s0032-3861(98)00466-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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21
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Franco L, Navarro E, Subirana J, Puiggalı́ J. Incorporation of glycine residues in even–even nylons disrupts their characteristic all-trans conformation. POLYMER 1998. [DOI: 10.1016/s0032-3861(97)10251-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Koch AW, Holstein TW, Mala C, Kurz E, Engel J, David CN. Spinalin, a new glycine- and histidine-rich protein in spines of Hydra nematocysts. J Cell Sci 1998; 111 ( Pt 11):1545-54. [PMID: 9580562 DOI: 10.1242/jcs.111.11.1545] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Here we present the cloning, expression and immunocytochemical localization of a novel 24 kDa protein, designated spinalin, which is present in the spines and operculum of Hydra nematocysts. Spinalin cDNA clones were identified by in situ hybridization to differentiating nematocytes. Sequencing of a full-length clone revealed the presence of an N-terminal signal peptide, suggesting that the mature protein is sorted via the endoplasmic reticulum to the post-Golgi vacuole in which the nematocyst is formed. The N-terminal region of spinalin (154 residues) is very rich in glycines (48 residues) and histidines (33 residues). A central region of 35 residues contains 19 glycines, occurring mainly as pairs. For both regions a polyglycine-like structure is likely and this may be stabilized by hydrogen bond-mediated chain association. Similar sequences found in loricrins, cytokeratins and avian keratins are postulated to participate in formation of supramolecular structures. Spinalin is terminated by a basic region (6 lysines out of 15 residues) and an acidic region (9 glutamates and 9 aspartates out of 32 residues). Western blot analysis with a polyclonal antibody generated against a recombinant 19 kDa fragment of spinalin showed that spinalin is localized in nematocysts. Following dissociation of the nematocyst's capsule wall with DTT, spinalin was found in the insoluble fraction containing spines and the operculum. Immunocytochemical analysis of developing nematocysts revealed that spinalin first appears in the matrix but then is transferred through the capsule wall at the end of morphogenesis to form spines on the external surface of the inverted tubule and the operculum.
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Affiliation(s)
- A W Koch
- Department of Biophysical Chemistry, Biozentrum, University of Basel, Klingelbergstrasse 70, Switzerland
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23
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Fletcher MD, Campbell MM. Partially Modified Retro-Inverso Peptides: Development, Synthesis, and Conformational Behavior. Chem Rev 1998; 98:763-796. [PMID: 11848914 DOI: 10.1021/cr970468t] [Citation(s) in RCA: 160] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Puiggalí J, Subirana JA. An experimental Ramachandran plot for retropeptide derivatives: Conformational features of derivatives of GEM-diamino and malonyl amino acids. Biopolymers 1998. [DOI: 10.1002/(sici)1097-0282(199802)45:2<149::aid-bip5>3.0.co;2-s] [Citation(s) in RCA: 2] [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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25
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Navarro E, Alemán C, Puiggalí J. Crystallographic and Quantum Mechanical Results on Ψ[NHCO] Aliphatic Diamides. The Number of Methylenes Strongly Influences Their Structural and Conformational Properties. Macromolecules 1998. [DOI: 10.1021/ma970243k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eloísa Navarro
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - Carlos Alemán
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - Jordi Puiggalí
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
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26
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Alemán C. Chain conformation in polyretropeptides III: design of a 3(10) helix using alpha,alpha-dialkylated amino acids and retropeptide bonds. Proteins 1997; 29:575-82. [PMID: 9408953 DOI: 10.1002/(sici)1097-0134(199712)29:4<575::aid-prot16>3.0.co;2-j] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Computer simulations have been used to design a polypeptide with a 3(10) helix conformation. The study has been been performed taking advantage of the intrinsic helix forming tendency of alpha-Aminoisobutyric acid. In order to avoid the formation of the alpha helix, which is the other common helical conformation adopted by alpha-Aminoisobutyric acid-based peptides, retropeptide bonds have been included in the sequence. Thus, retropeptides are not able to form the intramolecular hydrogen bonding interactions characteristic of the alpha helix. The influences of both the peptide length and the solvent have been examined and compared with those of the polypeptide without retropeptide bonds.
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Affiliation(s)
- C Alemán
- Departament d'Enginyería Química, E.T.S. d'Enginyers Industrials de Barcelona, Universitat Politécnica de Catalunya, Spain
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Karle IL, Pramanik A, Banerjee A, Bhattacharjya S, Balaram P. ω-Amino Acids in Peptide Design. Crystal Structures and Solution Conformations of Peptide Helices Containing a β-Alanyl-γ-Aminobutyryl Segment. J Am Chem Soc 1997. [DOI: 10.1021/ja970566w] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- I. L. Karle
- Contribution from the Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India
| | - Animesh Pramanik
- Contribution from the Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India
| | - Arindam Banerjee
- Contribution from the Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India
| | - Surajit Bhattacharjya
- Contribution from the Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India
| | - P. Balaram
- Contribution from the Laboratory for the Structure of Matter, Naval Research Laboratory, Washington, DC 20375-5341, and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India
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Alemán C, Puiggalí J. Free energies of solvation in aqueous and organic solutions for solutes with amide, keto and ester functional groups. Chem Phys 1997. [DOI: 10.1016/s0301-0104(97)00176-6] [Citation(s) in RCA: 5] [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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Aleman C, Puiggalí J. Effect of the Folding of Methylene Units in the Conformational Preferences of Small Diesters. J Org Chem 1997; 62:3076-3080. [PMID: 11671687 DOI: 10.1021/jo962251p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The conformational preferences of dimethyl succinate and ethylene glycol diacetate have been explored in the gas phase using ab initio quantum mechanical calculations at the HF/6-31G(d) and MP2/6-31G(d) levels. Furthermore, the effects of both aqueous and carbon tetrachloride solvents have been estimated using the self-consistent reaction-field model developed by Miertus, Scrocco, and Tomasi and adapted to semiempirical methods by Orozco and Luque. The results have been interpreted in terms of the so-called "folding of methylene units", which is the tendency of the methylene units to adopt a gauche conformations when a short aliphatic segment is placed between two carbonyls. For dimethyl succinate the lowest energy conformation corresponds to the TTGTT as expected from our previous studies on the folding of methylene units. On the other hand, for ethylene glycol diacetate the global minimum is the TGG&Smacr;T conformation, which is stabilized by the simultaneous combination of two stereoelectronic effects: (i) the folding of methylene units and (ii) the gauche oxygen effects.
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Affiliation(s)
- Carlos Aleman
- Departament d'Enginyeria Quimica, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
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Alemán C, Puiggalí J. Conformational Preferences of the Asparagine Residue. Gas-Phase, Aqueous Solution, and Chloroform Solution Calculations on the Model Dipeptide. J Phys Chem B 1997. [DOI: 10.1021/jp963425+] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Puiggalí J, Aceituno JE, Navarro E, Campos JL, Subirana JA. Structure of n,3 Polyamides, a Group of Nylons with Two Spatial Hydrogen-Bond Orientations. Macromolecules 1996. [DOI: 10.1021/ma960069k] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Puiggalí
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - J. E. Aceituno
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - E. Navarro
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - J. L. Campos
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
| | - J. A. Subirana
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Spain
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Abstract
Incorporation of easily available achiral omega-amino acid residues into an oligopeptide results in substitution of amide bonds by polymethylene units of an aliphatic chain, thereby providing a convenient strategy for constructing a peptidomimetic. The central Gly-Gly segment of the helical octapeptide Boc-Leu-Aib-Val-Gly-Gly-Leu-Aib-Val-OMe(1) has been replaced by delta-amino-valeric acid (delta-Ava) residue in the newly designed peptide Boc-Leu-Aib-Val-delta-Ava-Leu-Aib-Val-OMe(2). 1H-nmr results clearly suggest that in the apolar solvent CDCl3, the delta-Ava residue is accommodated into a folded helical conformation, stabilized by successive hydrogen bonds involving the NH groups of Val(3), delta-Ava(4), and Leu(5). The delta-Ava residue must adopt a gauche-gauche-trans-gauche-gauche conformation along the central polymethylene unit of the aliphatic segment, a feature seen in an energy-minimized model conformation based on nmr parameters. The absence of hydrogen bonding functionalities, however, limits the elongation of the helix. In fact, in CDCl3, the folded conformation consists of an N-terminal helix spanning residues 1-4, followed by a Type II beta-turn at residues 5 and 6, whereas in strongly solvating media like (CD3)2SO, the unfolding of the N-terminal helix results in beta-turn conformations at Leu(1)-Aib(2). The Type II beta-turn at the Leu(5)-Aib(6) segment remains intact even in (CD3)2SO.CD comparisons of peptides 1 and 2 reveal a "nonhelical" spectrum for 2 in 2,2,2-trifluoroethanol.
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Affiliation(s)
- A Banerjee
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India
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Alemán C, Vega MC, Navarro E, Puiggalí J. Towards the understanding of the folding of methylene units in the glutamine residue. J Pept Sci 1996; 2:364-70. [PMID: 9230464 DOI: 10.1002/psc.75] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The conformational preferences of the methylenic sequence in the side chain of the glutamine residue were investigated by ab initio and semi-empirical quantum mechanical calculations and examination of both the Brookhaven Protein Databank and Cambridge Structural Data Base. The results were analysed on the basis of our previous findings about the folding of methylene groups in aliphatic segments. Both energy calculations and the crystallographic structure of small peptides indicate that methylene units of the glutamine residue tend to fold in a gauche conformation. In contrast, such groups usually adopt an all-trans conformation in proteins due basically to the entropic and solvent contributions. These results have been demonstrated by computing the entropic correction to the free energy and evaluating the solvent effects through SCRF calculations.
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Affiliation(s)
- C Alemán
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Spain
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Alemán C, Navarro E, Puiggalí J. Comparison between Diketones and Diamides: Effects of Carbonyl Groups on the Conformational Preferences of Small Aliphatic Segments. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp961245u] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carlos Alemán
- Departament d'Enginyeria Química, E.T.S. d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
| | - Eloísa Navarro
- Departament d'Enginyeria Química, E.T.S. d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
| | - Jordi Puiggalí
- Departament d'Enginyeria Química, E.T.S. d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
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Paredes N, Rodriguez-Galán A, Puiggalí J. Synthesis and structural study of a new biodegradable copolymer of nylon-11 and l-alanine. POLYMER 1996. [DOI: 10.1016/0032-3861(96)00245-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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36
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Navarro E, Alemán C, Subirana JA, Puiggalí J. On the Crystal Structure of Nylon 55. Macromolecules 1996. [DOI: 10.1021/ma960005+] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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