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@ARTICLE{deBianchi:16562,
author = {de Bianchi, S. and Betterle, N. and Kouril, R. and
Cazzaniga, S. and Boekema, E. and Bassi, R. and Dall'Osto,
L.},
title = {{A}rabidopsis {M}utants {D}eleted in the
{L}ight-{H}arvesting {P}rotein {L}hcb4 {H}ave a {D}isrupted
{P}hotosystem {II} {M}acrostructure and {A}re {D}efective in
{P}hotoprotection},
journal = {The Plant Cell},
issn = {1040-4651},
address = {Rockville, Md.},
publisher = {Soc.},
reportid = {PreJuSER-16562},
pages = {2659 - 2679},
year = {2011},
note = {We thank Giovanni Finazzi (Commissariat a l'Energie
Atomique, Grenoble, France) for helpful discussion.
Financial support for this work was provided by the
Programmi di Ricerca di Interesse Nazionale (2008XB774B) and
by a grant of the Italian Ministry of Research and Marie
Curie Actions Initial Training Networks HARVEST (Grant
238017).},
abstract = {The role of the light-harvesting complex Lhcb4 (CP29) in
photosynthesis was investigated in Arabidopsis thaliana by
characterizing knockout lines for each of the three Lhcb4
isoforms (Lhcb4.1/4.2/4.3). Plants lacking all isoforms
(koLhcb4) showed a compensatory increase of Lhcb1 and a
slightly reduced photosystem II/I ratio with respect to the
wild type. The absence of Lhcb4 did not result in alteration
in electron transport rates. However, the kinetic of state
transition was faster in the mutant, and nonphotochemical
quenching activity was lower in koLhcb4 plants with respect
to either wild type or mutants retaining a single Lhcb4
isoform. KoLhcb4 plants were more sensitive to
photoinhibition, while this effect was not observed in
knockout lines for any other photosystem II antenna subunit.
Ultrastructural analysis of thylakoid grana membranes showed
a lower density of photosystem II complexes in koLhcb4.
Moreover, analysis of isolated supercomplexes showed a
different overall shape of the C₂S₂ particles due to a
different binding mode of the S-trimer to the core complex.
An empty space was observed within the photosystem II
supercomplex at the Lhcb4 position, implying that the
missing Lhcb4 was not replaced by other Lhc subunits. This
suggests that Lhcb4 is unique among photosystem II antenna
proteins and determinant for photosystem II
macro-organization and photoprotection.},
keywords = {Arabidopsis: genetics / Arabidopsis: physiology /
Arabidopsis: ultrastructure / Arabidopsis Proteins: genetics
/ Arabidopsis Proteins: metabolism / Chlorophyll: chemistry
/ Chlorophyll Binding Proteins: genetics / Chlorophyll
Binding Proteins: metabolism / Fluorescence / Gene Knockdown
Techniques / Light / Lipid Peroxidation / Membrane Lipids:
chemistry / Membrane Lipids: metabolism /
Oxidation-Reduction / Oxidative Stress / Oxygen: metabolism
/ Photosynthesis: physiology / Photosynthetic Reaction
Center Complex Proteins: genetics / Photosynthetic Reaction
Center Complex Proteins: metabolism / Photosystem I Protein
Complex: metabolism / Photosystem II Protein Complex:
metabolism / Photosystem II Protein Complex: ultrastructure
/ Protein Isoforms: genetics / Protein Isoforms: metabolism
/ Temperature / Thylakoids: chemistry / Thylakoids:
metabolism / Thylakoids: ultrastructure / Arabidopsis
Proteins (NLM Chemicals) / Chlorophyll Binding Proteins (NLM
Chemicals) / LHCB4.1 protein, Arabidopsis (NLM Chemicals) /
Membrane Lipids (NLM Chemicals) / Photosynthetic Reaction
Center Complex Proteins (NLM Chemicals) / Photosystem I
Protein Complex (NLM Chemicals) / Photosystem II Protein
Complex (NLM Chemicals) / Protein Isoforms (NLM Chemicals) /
Chlorophyll (NLM Chemicals) / Oxygen (NLM Chemicals) / J
(WoSType)},
cin = {IBG-2},
ddc = {570},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Biochemistry $\&$ Molecular Biology / Plant Sciences / Cell
Biology},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:21803939},
pmc = {pmc:PMC3226214},
UT = {WOS:000294164300020},
doi = {10.1105/tpc.111.087320},
url = {https://juser.fz-juelich.de/record/16562},
}