Abstract
A low potential light reaction in chromatophores of Chromatium D has been studied by means of oxidation—reduction potential titrations of laser-induced absorbance changes at 435 nm and 410 nm. This reaction, operating at potentials which are low enough to inactivate the P883 (P435) reaction center, has an apparent E m of −145 mV and is attenuated as the potential is lowered with an E m of −318 mV (n = 1). Its spectrum at −260 mV has a peak at 424 nm (compared with peaks at 423 nm and 432 nm for P435 at +415 mV), and its rise half-time appears to be around 75 nsec (compared with <50 nsec for P435). Although this system may represent either a new reaction center or a different form of P883, it is apparent that thermodynamically it is able to donate electrons to NAD +.
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