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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Blankenship, Robert E. Mielke, Steven P. Kiang, Nancy Y. Mauzerall, David |
| Description | Author Affiliation: Mielke SP ( Laboratory of Photobiology, The Rockefeller University, New York, NY 10065, USA. spmielke@gmail.com) |
| Abstract | Acaryochloris marina is the only species known to utilize chlorophyll (Chl) d as a principal photopigment. The peak absorption wavelength of Chl d is redshifted ≈ 40 nm in vivo relative to Chl a , enabling this cyanobacterium to perform oxygenic phototrophy in niche environments enhanced in far-red light. We present measurements of the in vivo energy-storage (E-S) efficiency of photosynthesis in A. marina , obtained using pulsed photoacoustics (PA) over a 90-nm range of excitation wavelengths in the red and far-red. Together with modeling results, these measurements provide the first direct observation of the trap energies of PSI and PSII, and also the photosystem-specific contributions to the total E-S efficiency. We find the maximum observed efficiency in A. marina (40 ± 1% at 735 nm) is higher than in the Chl a cyanobacterium Synechococcus leopoliensis (35 ± 1% at 690 nm). The efficiency at peak absorption wavelength is also higher in A. marina (36 ± 1% at 710 nm vs. 31 ± 1% at 670 nm). In both species, the trap efficiencies are ≈ 40% (PSI) and ≈ 30% (PSII). The PSI trap in A. marina is found to lie at 740 ± 5 nm, in agreement with the value inferred from spectroscopic methods. The best fit of the model to the PA data identifies the PSII trap at 723 ± 3 nm, supporting the view that the primary electron-donor is Chl d , probably at the accessory (Chl $_{D1}$ ) site. A decrease in efficiency beyond the trap wavelength, consistent with uphill energy transfer, is clearly observed and fit by the model. These results demonstrate that the E-S efficiency in A. marina is not thermodynamically limited, suggesting that oxygenic photosynthesis is viable in even redder light environments. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 3 |
| Volume Number | 1827 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-03-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Chlorophyll Metabolism Cyanobacteria Photosynthesis Photosystem I Protein Complex Photosystem II Protein Complex Thermodynamics Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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