ArticleProceedings of the National Academy of Sciences of the United States of America1993
Two functionally distinct forms of the photosystem II reaction-center protein D1 in the cyanobacterium Synechococcus sp. PCC 7942.
Article in Proceedings of the National Academy of Sciences of the United States of America, 1993. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
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30 citing papers in PubMed, 91 citations in OpenAlex.
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- Comparative Thermophysiology of MarineFrontiers in microbiology · 2022Article
- Lysyl oxidase-like protein secreted from an acidophilic red alga,Plant direct · 2018Article
- FLAVODIIRON2 and FLAVODIIRON4 proteins mediate an oxygen-dependent alternative electron flow in Synechocystis sp. PCC 6803 under CO2-limited conditions.Plant physiology · 2015Article
- Flavodiiron protein Flv2/Flv4-related photoprotective mechanism dissipates excitation pressure of PSII in cooperation with phycobilisomes in Cyanobacteria.Plant physiology · 2014Article
- Natural variants of photosystem II subunit D1 tune photochemical fitness to solar intensity.The Journal of biological chemistry · 2013Article
- Positive regulation of psbA gene expression by cis-encoded antisense RNAs in Synechocystis sp. PCC 6803.Plant physiology · 2012Article
- Prochlorococcus and Synechococcus have Evolved Different Adaptive Mechanisms to Cope with Light and UV Stress.Frontiers in microbiology · 2012Article
- Light history influences the response of the marine cyanobacterium Synechococcus sp. WH7803 to oxidative stress.Plant physiology · 2011Article
- Cyanobacterial psbA gene family: optimization of oxygenic photosynthesis.Cellular and molecular life sciences : CMLS · 2009Review
- Responses of a thermophilic Synechococcus isolate from the microbial mat of Octopus Spring to light.Applied and environmental microbiology · 2007Article
- Impaired photosynthesis in phosphatidylglycerol-deficient mutant of cyanobacterium Anabaena sp. PCC7120 with a disrupted gene encoding a putative phosphatidylglycerophosphatase.Plant physiology · 2006Article
- Phase Transition of Thylakoid Membranes Modulates Photoinhibition in the Cyanobacterium Anabaena siamensis.Photosynthesis research · 2003Article
- A redox-responsive regulator of photosynthesis gene expression in the cyanobacterium Synechocystis sp. Strain PCC 6803.Journal of bacteriology · 2000Article
- Characterization of processes responsible for the distinct effect of herbicides DCMU and BNT on Photosystem II photoinactivation in cells of the cyanobacterium Synechococcus sp. PCC 7942.Photosynthesis research · 2000Article
- Chlorophyll fluorescence analysis of cyanobacterial photosynthesis and acclimation.Microbiology and molecular biology reviews : MMBR · 1998Review
- Inactivation of the clpP1 gene for the proteolytic subunit of the ATP-dependent Clp protease in the cyanobacterium Synechococcus limits growth and light acclimation.Plant molecular biology · 1998Article
- The cyanobacterium Synechococcus resists UV-B by exchanging photosystem II reaction-center D1 proteins.Proceedings of the National Academy of Sciences of the United States of America · 1998Article
- Predicting Light Acclimation in Cyanobacteria from Nonphotochemical Quenching of Photosystem II Fluorescence, Which Reflects State Transitions in These Organisms.Plant physiology · 1996Article
- Over-production of the D1:2 protein makes Synechococcus cells more tolerant to photoinhibition of photosystem II.Plant molecular biology · 1996Article
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4 authors at 1 institution in 1 country.
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Abstract
The cyanobacterium Synechococcus sp. PCC 7942 possesses a small psbA multigene family that codes for two distinct forms of the photosystem II reaction-center protein D1 (D1:1 and D1:2). We showed previously that the normally predominant D1 form (D1:1) was rapidly replaced with the alternative D1:2 when cells adapted to a photon irradiance of 50 mumol.m-2.s-1 are shifted to 500 mumol.m-2.s-1 and that this interchange was readily reversible once cells were allowed to recover under the original growth conditions. By using the psbA inactivation mutants R2S2C3 and R2K1 (which synthesize only D1:1 and D1:2, respectively), we showed that this interchange between D1 forms was essential for limiting the degree of photoinhibition as well as enabling a rapid recovery of photosynthesis. In this report, we have extended these findings by examining whether any intrinsic functional differences exist between the two D1 forms that may afford increased resistance to photoinhibition. Initial studies on the rate of D1 degradation at three photon irradiances (50, 200, and 500 mumol.m-2.s-1) showed that the rates of degradation for both D1 forms increase with increasing photon flux density but that there was no significant difference between D1:1 and D1:2. Analysis of light-response curves for oxygen evolution for the mutants R2S2C3 and R2K1 revealed that cells with photosystem II reaction centers containing D1:2 have a higher apparent quantum yield (approximately 25%) than cells possessing D1:1. Further studies using chlorophyll a fluorescence measurements confirmed that R2K1 has a higher photochemical yield than R2S2C3; that is, a more efficient conversion of excitation energy from photon absorption into photochemistry. We believe that the higher photochemical efficiency of reaction centers containing D1:2 is causally related to the preferential induction of D1:2 at high light and thus may be an integral component of the protection mechanism within Synechococcus sp. PCC 7942 against photoinhibition.
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