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Reported crystallographic data and calculated molecular models indicated that chlorophyll (Chl) a and bacteriochlorophyll (BChl) a tend to bind the fifth ligand on the side of the macrocycle where the C132-(R)-methoxycarbonyl moiety protrudes (denoting the ‘back’ side). The crystal structures of 34 photosynthetic proteins possessing (B)Chl cofactors(More)
Zinc analogues of bacteriochlorophylls c and d self-assembled in aqueous media with phospholipids. A methanol solution of zinc chlorin and alpha-lecithin was put in a cellulose tube and the inner methanol solvent was gradually replaced with water by dialysis to form the self-assembled oligomers. Visible absorption spectra of the aqueous solution showed that(More)
A preference for one of the two axial ligand-binding sites on the central metal atom of chlorophylls (Chls) and bacteriochlorophylls (BChls) was confirmed. In recently reported crystallographic data on PS2 and LHC2 complexes, there are 42 Chl molecules whose fifth ligands were identified; 33 of 42 molecules bound the fifth ligand at the axial position where(More)
Chlorophyll-a (Chl-a) was readily converted into Chl-d under mild conditions without any enzymes. Treatment of Chl-a dissolved in dry tetrahydrofuran (THF) with thiophenol and acetic acid at room temperature successfully produced Chl-d in 31% yield. During the acidic oxidation, removal of the central magnesium, pheophytinization, was sufficiently(More)
Effects of the C132-methoxycarbonyl moiety on the self-assembly of chlorosomal chlorophylls (Chls) were studied. Model compounds, zinc methyl 3-devinyl-3-(1-hydroxymethyl)-pheophorbides a and a′ (Zn-31-OH-Chls a/a′, C132-epimers) were synthesized from Chl a, and their aggregation behaviors were examined in Triton X-100 (TX-100) micellar suspensions and in(More)
The C3-vinyl group of a chlorophyll derivative, methyl pyropheophorbide-a, was converted into the formyl group by a novel one-pot reaction with thiophenol at room temperature. The mild reaction can provide insight into development of 'green' catalysts displacing OsO(4) or O(3), and into elucidation of unknown biosynthetic processes of chlorophyll-d.
Thermoresponsive immunonephelometry was achieved with biotinylated poly(acrylate) and thermoresponsive gold nanocomposites composed of 13-nm gold nanoparticles and thermoresponsive polymers containing triethylenetetramine and biotin groups. The avidin-biotin interaction was used to model an immunoreaction in order to demonstrate thermoresponsive(More)
We developed novel methods to convert the C3-vinyl group of a chlorophyll derivative, methyl pyropheophorbide-a, into an acetyl group, an epoxy group, and a formyl group via iodination with I2 and phenyliodine(III) bis(trifluoroacetate). Reaction of the iodinated intermediate with ethylene glycol and subsequent treatment with base led to formation of the(More)
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