Peterson Arskold, Sindra; Smith, Paul; Shen, Jian-Ren; Pace, Ronald; Krausz, Elmars
Active Photosystem II (PS II) cores were prepared from spinach, pea, Synechocystis PCC 6803, and Thermosynechococcus vulcanus, the latter of which has been structurally determined [Kamiya and Shen (2003) Proc Natl Acad Sci USA 100: 98-103]. Electrochromic shifts resulting from QA reduction by 1.7-K illumination were recorded, and the Qx and Qy absorption bands of the redox-active pheophytin a thus identified in the different organisms. The Qx transition is ∼3 nm (100 cm-1) to higher energy in...[Show more]
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