Why do chlorosomal chlorophylls lack the C132 -methoxycarbonyl moiety? An in vitro model study
作者： Toru Oba , Hitoshi Tamiaki
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摘要: Effects of the C132-methoxycarbonyl moiety on self-assembly 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) synthesized from Chl a, their aggregation behaviors examined in Triton X-100 (TX-100) micellar suspensions 6%THF/water, comparison with those pyrolized derivative, 3-devinyl-3-(1-hydroxymethyl)-132-demethoxycarbonyl-pheophorbide (Zn-31-OH-pyroChl a). Zn-31-OH-Chl formed self-aggregates TX-100 suspension gave Qy absorption peak at 703 nm, while Zn-31-OH-pyroChl aggregates 740 nm. In aggregate spectrum, red-shift was smaller, band shape broader, contribution residual monomer more intense than that spectrum. The bulky C132-moiety limits ways molecular association, electronic interaction between component molecules is weakened. Stereoselective control C132-epimer also examined.
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