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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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PsbS enhances nonphotochemical fluorescence quenching in the absence of zeaxanthin.

Leaves and chloroplasts from Arabidopsis plants with increased amounts of PsbS protein showed the same percentage increase in nonphotochemical quenching in comparison to the wild type both in the presence and absence of zeaxanthin. The absorption change at 525-535 nm was also more pronounced in both cases. It is suggested that PsbS alone can cause the quenching, supporting the model in which zeaxanthin acts as an allosteric activator and is not the primary cause of the process. It is proposed that PsbS acts as a trigger of the conformational change that leads to the establishment of nonphotochemical quenching.[1]

References

  1. PsbS enhances nonphotochemical fluorescence quenching in the absence of zeaxanthin. Crouchman, S., Ruban, A., Horton, P. FEBS Lett. (2006) [Pubmed]
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