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Photoproduction of hydrogen by sulfur-deprived C. reinhardtii mutants with impaired Photosystem II photochemical activity

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Abstract

Photoproduction of H2 was examined in a series of sulfur-deprived Chlamydomonas reinhardtii D1-R323 mutants with progressively impaired PSII photochemical activity. In the R323H, R323D, and R323E D1 mutants, replacement of arginine affects photosystem II (PSII) function, as demonstrated by progressive decreases in O2-evolving activity and loss of PSII photochemical activity. Significant changes in PSII activity were found when the arginine residue was replaced by negatively charged amino acid residues (R323D and R323E). However, the R323H (positively charged or neutral, depending on the ambient pH) mutant had minimal changes in PSII activity. The R323H, R323D, and R323E mutants and the pseudo-wild-type (pWt) with restored PSII function were used to study the effects of sulfur deprivation on H2-production activity. All of these mutants exhibited significant changes in the normal parameters associated with the H2-photoproduction process, such as a shorter aerobic phase, lower accumulation of starch, a prolonged anaerobic phase observed before the onset of H2-production, a shorter duration of H2-production, lower H2 yields compared to the pWt control, and slightly higher production of dark fermentation products such as acetate and formate. The more compromised the PSII photochemical activity, the more dramatic was the effect of sulfur deprivation on the H2-production process, which depends both on the presence of residual PSII activity and the amount of stored starch.

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Abbreviations

Chl:

Chlorophyll

DCMU:

3-(3,4-Dichlorophenyl)-1,1-dimethylurea

F:

The fluorescence level at time t

(F-F0)/F0 :

Fluorescence yield at a particular time

F0 :

Fluorescence emitted by a sample at low-light levels prior to actinic-flash excitation

Fi :

The initial peak of a fluorescence induction curve

Fmax :

Maximum fluorescence yield following actinic-flash excitation

F′m :

Maximum fluorescence level under the ambient light induced by a saturating light pulse

Fp :

The saturating level of a fluorescence induction curve

Ft :

The steady-state level of fluorescence measured under ambient light prior to a saturating light pulse

\(\frac{\Delta F} {F^{\prime}_m}=(F^{\prime}_{m}-F_i)/F^{\prime}_{m}\) :

Measure of the photochemical conversion efficiency (or photochemical activity) of PSII

Fv :

Variable fluorescence level (Fm−F0)

OEC:

O2-Evolving complex

PAM:

Pulse amplitude modulated

PAR:

Photosynthetically active radiation

PQ:

Plastoquinone

PSII:

Photosystem II

pWt:

Pseudo-wild-type

QA :

The primary quinone acceptor of PSII

QB :

The secondary quinone acceptor of PSII

TAP:

TRIS-acetate-phosphate medium

YD :

Tyr-160 of the D2 polypeptide

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Acknowledgments

The authors would like to acknowledge the NREL LDRD program (MS), the Division of Energy Biosciences, Basic Energy Sciences, US Department of Energy (MS and MLG), and the Russian Foundation for Basic Research (ABR, TEK, BKS, GPK and SK). The work at the Ohio State University was supported under subcontract through NREL (RTS). Valeria Makarova would also like to thank the NREL LDRD program for support while at NREL.

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Correspondence to Michael Seibert.

Appendix

Appendix

Fig. 5
figure 5

EPR spectrum of pWt cells sampled during the mid-logarithmic phase of growth. The amount of assembled PSII complex was determined from EPR measurements of the SII signal performed with a Bruker E500 spectrometer at low temperature (77 K). All samples exhibited a narrow (line width, ΔH = 9–12 Gauss) EPR signal at g = 2.0041, attributable to presence of the Y +D paramagnetic species. No significant difference was found in the EPR signal parameters or the concentration of Y +D spins, calculated on a Chl basis, between the pWt and any of the R323 mutants. The EPR signal intensities of the mutants normalized per mg of Chl varied within 20% of the pWt signal, which is shown above. Sample size, 0.3–0.4 ml; total Chl concentration, 1.5–2 mg ml−1. EPR recording conditions: frequency, 9.4 GHz; power, 6 mW; field modulation amplitude 1G; field modulation frequency, 100 kHz; single scan. The spectrum was recorded in dark

Fig. 6
figure 6

Chl fluorescence induction curves for pWt and mutant algal culture samples grown in sulfur-replete TAP medium. All curves were measured with a PAM fluorometer. The samples were removed from the bioreactors during the mid-logarithmic phase of growth, adjusted to equal Chl concentration, and dark adapted for 2 min before measurements. The fluorescence induction curve of the control pWt sample exhibited two components. The fast component (from F0 to Fi) reflects the accumulation of reduced QA in QB-non-reducing PSII centers and the presence of PSII centers with a doubly-reduced QB prior to illumination. The slow component (from Fi to Fp) represents the subsequent accumulation of reductants in the PQ-pool at high light intensity. The induction curves measured with the R323H and R323N mutants had shapes similar to that of pWt. However, the F0 level was increased, and the maximal fluorescence yield was reduced compared to the pWt. The R323D curve had an intermediate character. The fluorescence induction curve measured with the R323E mutant exhibited a barely-detectable, residual, slow-rise component. The halftime for transition from the Fi to the Fp level (in ms), which is a measure of the time it takes to reduce the PQ pool, also increased progressively in the mutants: pWt (170), R323H (240), R323N (270), and R323D (390)

Fig. 7
figure 7

Flash-probe chlorophyll fluorescence decay kinetics of pWt and R323H,N,D,E cells in the presence of DCMU (which blocks Q- A → QB electron transfer). Samples were taken from the bioreactors during the mid-logarithmic phase of growth on TAP medium, concentrated by centrifugation to a Chl concentration of 40 μg ml−1, and dark adapted for 5 min before measurement

Table 3 Flash-induced fluorescence decay after a single flash

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Makarova, V.V., Kosourov, S., Krendeleva, T.E. et al. Photoproduction of hydrogen by sulfur-deprived C. reinhardtii mutants with impaired Photosystem II photochemical activity. Photosynth Res 94, 79–89 (2007). https://doi.org/10.1007/s11120-007-9219-4

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