Structures of tryptophan, NFK, kynurenine, and PSII.

Abstract

<p>(A) shows the chemical structures of NFK (+32 <i>m/z</i>) and kynurenine (+4 <i>m/z</i>). (B) shows models of PSII (top) and TW (bottom) PSII. Tris-washing removes the extrinsic subunits and OEC, or Mn<sub>4</sub>CaO<sub>5</sub> cluster. The core subunits (CP43, D1, D2 and CP47) and electron transfer cofactors (tyrosine z (Y<sub>z</sub>), P<sub>680</sub>, pheophytin (Pheo), plastoquinone A (Q<sub>A</sub>), and plastoquinone B (Q<sub>B</sub>)) are labeled. The water-splitting reaction at the OEC is shown. The ROS species generated in PSII and TW PSII during photoinhibition are indicated. The subunit colors are the same as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042220#pone-0042220-g008" target="_blank">Figure 8</a>. CP43 (pink); D1 (green); D2 (light blue); CP47 (dark blue); extrinsic subunits (violet, yellow, and orange).</p

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