NDLI: Construction of Chlorosomal Rod Self-Aggregates in the Solid State on Any Substrates from Synthetic Chlorophyll Derivatives Possessing an Oligomethylene Chain at the 17-Propionate Residue

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Construction of Chlorosomal Rod Self-Aggregates in the Solid State on Any Substrates from Synthetic Chlorophyll Derivatives Possessing an Oligomethylene Chain at the 17-Propionate Residue

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Construction of Chlorosomal Rod Self-Aggregates in the Solid State on Any Substrates from Synthetic Chlorophyll Derivatives Possessing an Oligomethylene Chain at the 17-Propionate Residue

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Shoji, Sunao Tamiaki, Hitoshi Hashishin, Takeshi
Description	Author Affiliation: Shoji S ( Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.)
Abstract	Chlorosomes are one of the most unique natural light-harvesting antennas and their supramolecular nanostructures are still under debate. Chlorosomes contain bacteriochlorophyll (BChl)-c, d and e molecules and these pigments self-aggregate under a hydrophobic environment inside a chlorosome. The self-aggregates are mainly constructed by the following three interactions: hydrogen bonding, coordination bonding and π–π stacking. Supramolecular nanostructures of self-aggregated BChls have been widely investigated by spectroscopic and microscopic techniques. Model compounds of such chlorosomal BChl molecules have been synthesized and the effects of esterified long alkyl chains at the 17-propionate residue for their self-aggregation have been studied. Structurally simple zinc chlorophyll derivatives possessing an oligomethylene chain as the esterifying group at the 17-propionate residue were prepared as chlorosomal BChl models. The synthetic zinc BChls self-aggregated in nonpolar organic solvents to give precipitates. The resulting insoluble self-aggregated solids were investigated on a variety of substrates, including hydrophobic, neutral and hydrophilic substrates, by visible absorption, circular dichroism and polarized light absorption spectroscopies, as well as atomic force, transmission electron and scanning electron microscopies. The self-aggregates of synthetic Zn-BChls formed rods with an approximately 5 nm diameter and wires with further elongated growth of the rods (aspect ratio >200). The diameter size was consistent with that estimated for natural chlorosomal rods in a filamentous anoxygenic phototroph, Chloroflexus aurantiacus. The supramolecular formation and stability of the rod on the examined substrates depended on the length of an oligomethylene chain at the 17-propionate residue as well as on the surface properties. Especially, the number of the 5 nm rods on the substrates increased with an elongation of the chain.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	42
Volume Number	18
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2012-10-15
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Propionates Chemistry Bacterial Proteins Bacteriochlorophylls Biocompatible Materials Chemical Synthesis Chloroflexus Metabolism Coordination Complexes Light-Harvesting Protein Complexes Microscopy, Atomic Force Nanostructures Zinc Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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