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. 2021 Jul 23;118(30):e2103203118. doi: 10.1073/pnas.2103203118

Fig. 2.

Fig. 2.

H-bond network of QB. (A) QB (before the first electron transfer): Ser-L223 donates an H-bond to Asp-L213. (B) QB: Ser-L223 donates an H-bond to QB. (C) QB•− (after the first electron transfer) in the pre-PT H-bond pattern. (D) QBH• in the post-PT H-bond pattern. (E) QBH− (after the second electron transfer). Black dotted lines indicate H-bonds. Red dotted lines indicate proton-conducting H-bonds. H atoms in the H-bond network are depicted as white sticks. Note that Glu-L212 is deprotonated in neutral unprotonated QB and protonated in other states.