Comparison of photosynthetic performances of marine picocyanobacteria with different configurations of the oxygen-evolving complex
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897701" target="_blank" >RIV/60076658:12310/18:43897701 - isvavai.cz</a>
Alternative codes found
RIV/61388971:_____/18:00496457
Result on the web
<a href="https://link.springer.com/content/pdf/10.1007%2Fs11120-018-0539-3.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007%2Fs11120-018-0539-3.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11120-018-0539-3" target="_blank" >10.1007/s11120-018-0539-3</a>
Alternative languages
Result language
angličtina
Original language name
Comparison of photosynthetic performances of marine picocyanobacteria with different configurations of the oxygen-evolving complex
Original language description
The extrinsic PsbU and PsbV proteins are known to play a critical role in stabilizing the Mn4CaO5 cluster of the PSII oxygen-evolving complex (OEC). However, most isolates of the marine cyanobacterium Prochlorococcus naturally miss these proteins, even though they have kept the main OEC protein, PsbO. A structural homology model of the PSII of such a natural deletion mutant strain (P. marinus MED4) did not reveal any obvious compensation mechanism for this lack. To assess the physiological consequences of this unusual OEC, we compared oxygen evolution between Prochlorococcus strains missing psbU and psbV (PCC 9511 and SS120) and two marine strains possessing these genes (Prochlorococcus sp. MIT9313 and Synechococcus sp. WH7803). While the low light-adapted strain SS120 exhibited the lowest maximal O-2 evolution rates (P-max per divinyl-chlorophyll a, per cell or per photosystem II) of all four strains, the high light-adapted strain PCC 9511 displayed even higher P-max(Chl) and P-max(PSII) at high irradiance than Synechococcus sp. WH7803. Furthermore, thermoluminescence glow curves did not show any alteration in the B-band shape or peak position that could be related to the lack of these extrinsic proteins. This suggests an efficient functional adaptation of the OEC in these natural deletion mutants, in which PsbO alone is seemingly sufficient to ensure proper oxygen evolution. Our study also showed that Prochlorococcus strains exhibit negative net O-2 evolution rates at the low irradiances encountered in minimum oxygen zones, possibly explaining the very low O-2 concentrations measured in these environments, where Prochlorococcus is the dominant oxyphototroph.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10611 - Plant sciences, botany
Result continuities
Project
<a href="/en/project/LO1416" target="_blank" >LO1416: Algatech plus</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Photosynthesis Research
ISSN
0166-8595
e-ISSN
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Volume of the periodical
138
Issue of the periodical within the volume
1
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
15
Pages from-to
57-71
UT code for WoS article
000447767200004
EID of the result in the Scopus database
2-s2.0-85049000258