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Chen T, Qin Z, Qi Y, Deng T, Ge X, Wang J, Hou X. Degradable polymers from ring-opening polymerization of α-angelica lactone, a five-membered unsaturated lactone. Polym Chem 2011. [DOI: 10.1039/c1py00067e] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A degradable polymer was prepared from α-angelica lactone, a five-membered unsaturated lactone, by ring-opening polymerization.
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Affiliation(s)
- Tieniu Chen
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Zhangfeng Qin
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Yongqin Qi
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Tiansheng Deng
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Xiaojing Ge
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Jianguo Wang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
| | - Xianglin Hou
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- PR China
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ALEMÁN CARLOS. Effect of the environment and role of the π-π stacking interactions in the stabilization of the 310-helix conformation in dehydroalanine oligopeptides. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1995.tb01075.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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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Alemán C, Casanovas J. Analysis of the oxalamide functionality as hydrogen bonding former: geometry, energetics, cooperative effects, NMR chemical characterization and implications in molecular engineering. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2003.12.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wu X, Zhao R, Li Z, Yao M, Wang H, Han J, Qu S, Chen X, Qian L, Sun Y, Xu Y, Gu J. A novel small peptide as a targeting ligand for receptor tyrosine kinase Tie2. Biochem Biophys Res Commun 2004; 315:1004-10. [PMID: 14985112 DOI: 10.1016/j.bbrc.2004.01.157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2004] [Indexed: 11/23/2022]
Abstract
Tie2 is an endothelium-specific receptor tyrosine kinase known to play an important role in tumor angiogenesis. We sought to identify a small peptide ligand against Tie2 for developing a delivery targeting agent. We used hydrophobic analysis and comparative sequence/structure analysis to select a minimal peptide based on angiopoietin-2 amino acid sequence. The resulting peptide named GA3(WTIIQRREDGSVDFQRTWKEYK) was synthesized and labeled with iodine-125 at the C-terminal tyrosine residue to characterize its binding capability. In in vitro binding assays, GA3 can not only specifically bind to SMMC7721-Tie2 but also compete with angiopoietin-2 in binding. Via mouse tail vein injection, 125I-labeled GA3 was found to favorably accumulate in SPC-A1 xenograft tumor tissues which positively express Tie2. These results demonstrated that GA3 may be useful as a drug or gene delivery ligand for targeted chemotherapy, radiotherapy, and gene therapy.
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Affiliation(s)
- Xianghua Wu
- National Laboratory for Oncogenes and Related Genes, Shanghai Cancer Institute, Shanghai Jiao-Tong University Medical School, Shanghai 200032, PR China
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Alemán C, Bella J. Chain conformation in polyretropeptides: Quantum mechanical and empirical force field calculations on 2,6,8-trioxo-3,5,9-triazadecane, a model compound for poly(retro-glycine). Biopolymers 2004. [DOI: 10.1002/bip.360350302] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Alemán C, Muñoz-Guerra S. Aplicaciones de los métodos computacionales al estudio de la estructura y propiedades de polímeros. POLIMEROS 2003. [DOI: 10.1590/s0104-14282003000400010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
En este trabajo se revisan las técnicas de simulación molecular más habituales y potentes para la descripción de los polímeros a escala atómica y molecular, las cuales se han clasificado en cuánticas o clásicas dependiendo de cómo se describen las interacciones entre las partículas. Se presentan asimismo diversas aplicaciones de dichas metodologías, realizadas en nuestro laboratorio, en el contexto del estudio de la estructura y propiedades de polímeros. En particular, se muestran aplicaciones de las técnicas clásicas a la determinación de estructuras cristalinas, a estudio del plegamiento lamelar de los nylons, a la estabilidad de las estructuras supramoleculares observadas en algunos complejos tensioactivo·polielectrolito y a la difusión de gases en matrices poliméricas, mientras que el uso de técnicas cuánticas se ha ilustrado presentando estudios dedicados a la predicción de efectos cooperativos, interacciones específicas y parámetros espectroscópicos.
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Zanuy D, Casanovas J, Alemán C. The conformation of dehydroalanine in short homopeptides: molecular dynamics simulations of a 6-residue chain. Biophys Chem 2002; 98:301-12. [PMID: 12128182 DOI: 10.1016/s0301-4622(02)00108-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A molecular dynamics study about the conformational preferences in a chloroform solution of a homo-oligomer constituted by six residues of dehydroalanine is presented. For this purpose, two sets of force-field parameters and explicit solvent molecules have been used. Furthermore, ab initio calculations have been performed in order to estimate 1[H]-NMR chemical shifts. Results have been compared with experimental data.
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Affiliation(s)
- David Zanuy
- Departament d'Enginyeria Quimica, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, E-08028, Barcelona, Spain
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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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Affiliation(s)
- Salvador León
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
| | - Carlos Alemán
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
| | - Sebastián Muñoz-Guerra
- Departament d'Enginyeria Química, ETS d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
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Alemán C, Galembeck SE. Intramolecular Electronic and Hydrogen-Bonding Interactions in N,N‘-Dimethyl-2,3-di-O-methyl-l-tartaramide. J Org Chem 1997. [DOI: 10.1021/jo962081g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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
| | - Sergio E. Galembeck
- 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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Navas JJ, Alemán C, Muñoz-Guerra S. Effects of Aqueous and Organic Solvents on the Conformational Properties of the Helix-Forming alpha-Methyl-beta-L-aspartamyl Residue. J Org Chem 1996; 61:6849-6855. [PMID: 11667579 DOI: 10.1021/jo952179f] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The conformational preferences of N-acetyl-N'-methyl-alpha-methyl-beta-L-aspartamide, which is the model compound for helical poly(beta-L-aspartate)s, have been determined by ab initio SCF-MO computations. Two driving patterns have been found for the existing 13 minimum energy conformations: (i) intramolecular hydrogen bonding interactions of both amide-amide and amide-ester type; and (ii) repulsive interactions between the four oxygen atoms contained in the molecule. Self-consistent reaction-field (SCRF) calculations based on the method proposed by Miertus, Scrocco, and Tomasi have been performed in order to evaluate the effect of the solvent on the conformational preferences of the compound subject of study. Water and carbon tetrachloride were the solvents chosen for this purpose, and results have been discussed and interpreted on the basis of their electronic structures. The conclusions drawn from this study are of assistance to understand some features of the conformational transitions experimentally found in poly(beta-L-aspartate)s.
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Affiliation(s)
- Juan José Navas
- Departament d'Enginyería Química, E. T. S. d'Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain
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Abstract
The potential energy surface of the phi [NHCO] delta Ala dipeptide has been computed using ab initio quantum mechanical calculations at different theoretical levels. Three degenerate minima were found and characterized. The most favoured conformation is stabilized by an intramolecular hydrogen bonding interaction. The other two minima correspond to helical and malonamide-like conformations, being 4.6 kcal/mol and 6.9 kcal/mol less stable than the lowest energy conformation, respectively. Influence of solvent effects on the relative stabilities of the different conformations have been accounted using SCRF calculations. Two implicit solvent models have been considered: water and CCl4. The results indicate that in the both cases the conformation with an intramolecular hydrogen bonding interaction retains its lowest energy.
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Affiliation(s)
- C Alemán
- Department d'Enginyeria Química, E.T.S.I.I.B., Universitat Politècnica de Catalunya, Barcelona, Spain
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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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