A stable LHCII-PSI aggregate and suppression of photosynthetic state transitions in the psae1-1 mutant of Arabidopsis thaliana.
Articolo
Data di Pubblicazione:
2002
Citazione:
A stable LHCII-PSI aggregate and suppression of photosynthetic state transitions in the psae1-1 mutant of Arabidopsis thaliana. / P. Pesaresi, C. Lunde, P. Jahns
D. Tarantino, J. Meurer, C. Varotto, R.D. Hirtz, C. Soave, H.V. Scheller,
F. Salamini, D. Leister. - In: PLANTA. - ISSN 0032-0935. - 215:6(2002 Aug 09), pp. 940-948.
Abstract:
During photosynthetic state transitions, a
fraction of the major light-harvesting complex (LHCII)
shuttles between photosystems II (PSII) and I (PSI),
depending on whether or not it is phosphorylated. Its
phosphorylation state in turn depends on the relative
activity of the two photosystems, which is a function of
redox state and illumination parameters. In the psae1-1
mutant of Arabidopsis thaliana (L.) Heynh., amounts of
the PSI subunits E, C, D, H and L are decreased. A
fraction of LHCII is stably associated with PSI
when plants are exposed to low light conditions, giving
rise to a high-molecular-mass protein–pigment complex
detectable in native protein gels. The formation of this
abnormalLHC II–PSI complex is associated with an
almost complete suppression of state transitions, a
drastic increase in the levels of phosphorylated LHCII
under all light regimes tested, and a permanent reduction
in PSII antenna size. All these observations suggest that
the altered polypeptide composition of PSI perturbs the
docking of phosphorylated LHCII, making psae1-1 a
unique mutant for the study of PSI–LHCII interactions
and additionaleffect s of the mutation, such as a decrease
in grana stacking and increased adenylate kinase activity.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Arabidopsis; Mutant; Photosynthesis; Photosystem I; State transition
Elenco autori:
P. Pesaresi, C. Lunde, P. Jahns
D. Tarantino, J. Meurer, C. Varotto, R.D. Hirtz, C. Soave, H.V. Scheller,
F. Salamini, D. Leister
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