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Thylakoid-Bound FtsH Proteins Facilitate Proper Biosynthesis of Photosystem I

Luca Tadini; and Eva-Mari Aro; Sanna Rantala; Dario Leister; Sari Järvi; Marjaana Suorsa; Aiste Ivanauskaite; Yagut Allahverdiyeva

Thylakoid-Bound FtsH Proteins Facilitate Proper Biosynthesis of Photosystem I

Luca Tadini
and Eva-Mari Aro
Sanna Rantala
Dario Leister
Sari Järvi
Marjaana Suorsa
Aiste Ivanauskaite
Yagut Allahverdiyeva
Katso/Avaa
PP2016-00200DR1_Merged_PDF-2.pdf (10.80Mb)
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AMER SOC PLANT BIOLOGISTS
doi:10.1104/pp.16.00200
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042715697
Tiivistelmä

Thylakoid membrane-bound FtsH proteases have a well-characterized role in degradation of the photosystem II (PSII) reaction center protein D1 upon repair of photodamaged PSII. Here, we show that the Arabidopsis (Arabidopsis thaliana) var1 and var2 mutants, devoid of the FtsH5 and FtsH2 proteins, respectively, are capable of normal D1 protein turnover under moderate growth light intensity. Instead, they both demonstrate a significant scarcity of PSI complexes. It is further shown that the reduced level of PSI does not result from accelerated photodamage of the PSI centers in var1 or var2 under moderate growth light intensity. On the contrary, radiolabeling experiments revealed impaired synthesis of the PsaA/B reaction center proteins of PSI, which was accompanied by the accumulation of PSI-specific assembly factors. psaA/B transcript accumulation and translation initiation, however, occurred in var1 and var2 mutants as in wild-type Arabidopsis, suggesting problems in later stages of PsaA/B protein expression in the two var mutants. Presumably, the thylakoid membrane-bound FtsH5 and FtsH2 have dual functions in the maintenance of photosynthetic complexes. In addition to their function as a protease in the degradation of the photodamaged D1 protein, they also are required, either directly or indirectly, for early assembly of the PSI complexes.

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