Fig. 6.

Electron transfer times in LET. The cartoon summarizes electron transfer times either measured in this study or taken from the literature. Data from the literature: 1) Electron transfer from PC bound to the cyt b₆f complex (6 to 59 μs): Calculated with $v_{\mathrm{cyt}f=>\mathrm{PC}+}=\hspace{0.17em}k\cdot \left[\mathrm{PC}\right]\cdot \left[\mathrm{cyt}\hspace{0.17em}f\right]$ with (k) of 1.7⋅10⁷ M⁻¹⋅s⁻¹ (61) to 4.5⋅10⁷ M⁻¹⋅s⁻¹ (62), the [PC] = 3.6 mM, and [cyt f] either 0.27 mM (only cyt b₆f in stacked) or 0.51 mM (all cyt b₆f complexes). 2) Total electron transfer time between cyt f and P700 of 220 to 300 μs from refs. 19, 42, and 43. 3) Electron transfer from PC to P700 for PSI-bound PC from ref. 62. The 130 μs gives an upper estimate for this electron transfer step since it represents the rate-limiting unbinding of PC from PSI (62). 4) cyt b₆f complex turnover of 3.3 ms (63). All other numbers were determined in this study. Cyt b₆f complexes not participating in LET are indicated on the Right. These complexes can but must not necessarily participate in CEF. Therefore, they were labeled “non-LET.” The different situation in curt1abcd is shown in red box.