Controlled stacking and unstacking of peripheral chlorophyll units drives the spring-like contraction and expansion of a semi-artificial helical polymer

Chemistry - A European Journal

Volumn 19, Issue 5, 2013, Pages 1592-1598

  Numata, Munenori ^a   Kinoshita, Daiki ^a   Hirose, Naoya ^a   Kozawa, Tomohiro ^a   Tamiaki, Hitoshi ^b   Kikkawa, Yoshihiro ^c   Kanesato, Masatoshi ^c  

^a KYOTO PREFECTURAL UNIVERSITY   (Japan)

^b RITSUMEIKAN UNIVERSITY   (Japan)

^c NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY AIST   (Japan)

Author keywords

chlorophyll; helical polymers; nanomachines; polysaccharides; supramolecular chemistry

Indexed keywords

AGGREGATION/DISAGGREGATION; AMPHIPHILIC MOLECULES; AMPHIPHILICS; AQUEOUS MEDIA; CONTRACTION AND EXPANSION; DRUG CARRIER; HELICAL POLYMERS; MOLECULAR INFORMATION; NANOMACHINES; POLYMER CHEMISTRY; POLYMER CONFORMATION; POWER DEVICES; STIMULI-RESPONSIVE; SUPRAMOLECULAR SCIENCE;

CHLOROPHYLL; MOLECULAR RECOGNITION; POLYSACCHARIDES; SUPRAMOLECULAR CHEMISTRY;

POLYMERS;

CHLOROPHYLL; DNA BINDING PROTEIN; LIGAND; POLYMER; POLYSACCHARIDE;

ARTICLE; CHEMICAL REACTION; CHEMISTRY; CONFORMATION; NANOTECHNOLOGY; PROTEIN SECONDARY STRUCTURE;

CHLOROPHYLL; DNA-BINDING PROTEINS; LIGANDS; MOLECULAR CONFORMATION; NANOTECHNOLOGY; ORGANIC CHEMISTRY PROCESSES; POLYMERS; POLYSACCHARIDES; PROTEIN STRUCTURE, SECONDARY;

EID: 84872707699     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.201203569     Document Type: Article

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28. 2O is added to this DMSO solution, curdlan can retrieve its original triple helix. This unique self-assembling nature of curdlan has been investigated by us and other groups (see Ref. [3 a], and references cited therein).
29. When curdlan adopts a triple-helix structure, the CD intensity of the peripheral chromophore units increases as a result of their regular arrangement on the helical curdlan structure; see:, M. Ikeda, S. Haraguchi, M. Numata, S. Shinkai, Chem. Asian J. 2007, 2, 1290-1298.
30. We could not directly confirm the morphology of CUR-Chl by AFM because of its nonvolatility of DMSO. Because DMSO is a good solvent for both curdlan and the peripheral chlorophyll units, CUR-Chl adopted an extended fibrous structure in this solvent, as was evidenced by its UV/Vis and CD spectra.
31. -1. Accordingly, the average length of CUR-Chl was approximately 200 nm.
32. 2O to the resultant DMSO solution to form CUR-Chl/ligand complexes.
33. Figure S6 in the Supporting Information reveals the effect of the [pyridine]/[chlorophyll] ratio on the morphology of CUR-Chl.
34. The contracted CUR-Chl samples were prepared through a globule aggregation process from its extended form. Therefore, there is slight discrepancy in CD spectra obtained in the absence of ligand.
35. The UV/Vis and CD spectral changes suggested that CUR-Chl interacted with PVP quantitatively. However, at a [PVP]/[chlorophyll] ratio of 0.5 AFM images showed random coil CUR-Chl in addition to straight fiber structures, presumably because of the dissociation of PVP from CUR-Chl during sample preparation. Accordingly, to ensure quantitative conversion from coils to straight fibers, an excess of PVP ([PVP]/[chlorophyll]=30) was added prior to recording the AFM image.