AI Article Synopsis
- The absorption and fluorescence emission spectra of RS601 resemble those of the purple nonsulfide bacteria Rb. sphaeroides.
- Under light, RS601 chromatophores reduced methyl viologen using DCPIPH(2) as an electron donor, indicating a standard noncyclic electron transport process.
- The study found that o-phenanthroline inhibited this electron transport but antimycin A did not, suggesting that the electron acceptance site for methyl viologen is located between the secondary electron acceptor Q(B) and cyt b, rather than at the Q(A) site.
Article Abstract
The absorption spectrum and fluorescence emission spectrum of RS601 were found to keep the typical characteristics of those of the purple nonsulfide bacteria Rb. sphaeroides. Under illumination, methyl viologen was reduced by RS601 chromatophores in the presence of DCPIPH(2) as the electron donor, setting up a standard noncyclic electron transport. o-phenanthroline with I(50) of 1.0 mM inhibited the DCPIPH(2) right curved arrow MV electron transport. Antimycin A did not inhibit the DCPIPH(2) right curved arrow MV electron transport and had no I(50). The results suggested that the exact site where methyl viologen accepted electron should locate between the secondary electron acceptor, Q(B), and cyt b, but not at the Q(A) binding site as indicated before. The difference of electron transport between reduced sides of reaction centers of Rb. sphaeroides and Rs. rubrum was discussed.
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