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Gene Review:

STN8 - serine/threonine-protein kinase STN8

Arabidopsis thaliana

Synonyms: STATE TRANSITION 8, State transition 8, T20L15.190, T20L15_190

Vainonen, J.P. et al., Bonardi, V. et al.

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High impact information on STN8

Phosphorylation of Thr-4 in the wild type required both light and prior phosphorylation at Thr-2, indicating that STN8 is a light-activated kinase that phosphorylates Thr-4 only after another kinase phosphorylates Thr-2 [1].
Combination of reversed genetics with analyses of in vivo protein phosphorylation in Arabidopsis thaliana revealed that STN8 protein kinase is specific in phosphorylation of N-terminal threonine residues in D1, D2, and CP43 proteins, and Thr-4 in the PsbH protein of photosystem II [1].
Acclimation to changes in light quality is defective in stn7 but not in stn8 mutants, indicating that short-term and long-term photosynthetic adaptations are coupled [2].

Biological context of STN8

Here we show that in Arabidopsis a second protein kinase, STN8, is required for the quantitative phosphorylation of PSII core proteins [2].

References

STN8 protein kinase in Arabidopsis thaliana is specific in phosphorylation of photosystem II core proteins. Vainonen, J.P., Hansson, M., Vener, A.V. J. Biol. Chem. (2005) [Pubmed]
Photosystem II core phosphorylation and photosynthetic acclimation require two different protein kinases. Bonardi, V., Pesaresi, P., Becker, T., Schleiff, E., Wagner, R., Pfannschmidt, T., Jahns, P., Leister, D. Nature (2005) [Pubmed]

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