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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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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DOI: https://doi.org/10.1007/s11120-007-9219-4