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  • Kovács, LaszloDepartment of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom (författare)

Lack of the light-harvesting complex CP24 affects the structure and function of the grana membranes of higher plant chloroplasts.

  • Artikel/kapitelEngelska2006

Förlag, utgivningsår, omfång ...

  • 2006-11-17
  • Oxford University Press (OUP),2006
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:umu-14197
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-14197URI
  • https://doi.org/10.1105/tpc.106.045641DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • The photosystem II (PSII) light-harvesting antenna in higher plants contains a number of highly conserved gene products whose function is unknown. Arabidopsis thaliana plants depleted of one of these, the CP24 light-harvesting complex, have been analyzed. CP24-deficient plants showed a decrease in light-limited photosynthetic rate and growth, but the pigment and protein content of the thylakoid membranes were otherwise almost unchanged. However, there was a major change in the macroorganization of PSII within these membranes; electron microscopy and image analysis revealed the complete absence of the C2S2M2 light-harvesting complex II (LHCII)/PSII supercomplex predominant in wild-type plants. Instead, only C2S2 supercomplexes, which are deficient in the LHCIIb M-trimers, were found. Spectroscopic analysis confirmed the disruption of the wild-type macroorganization of PSII. It was found that the functions of the PSII antenna were disturbed: connectivity between PSII centers was reduced, and maximum photochemical yield was lowered; rapidly reversible nonphotochemical quenching was inhibited; and the state transitions were altered kinetically. CP24 is therefore an important factor in determining the structure and function of the PSII light-harvesting antenna, providing the linker for association of the M-trimer into the PSII complex, allowing a specific macroorganization that is necessary both for maximum quantum efficiency and for photoprotective dissipation of excess excitation energy.

Ämnesord och genrebeteckningar

  • Arabidopsis/*metabolism/radiation effects/ultrastructure
  • Arabidopsis Proteins/analysis/isolation & purification/*metabolism
  • Chloroplasts/*ultrastructure
  • Chromatography; Gel
  • Circular Dichroism
  • DNA; Bacterial/metabolism
  • Fluorescence
  • Light
  • Light-Harvesting Protein Complexes/analysis/*deficiency/isolation & purification
  • Models; Biological
  • Mutagenesis; Insertional
  • Photosynthesis/radiation effects
  • Photosynthetic Reaction Center Complex Proteins/metabolism
  • Photosystem II Protein Complex/metabolism
  • Pigments; Biological/metabolism
  • Plant Leaves/radiation effects
  • RNA; Antisense/metabolism
  • Structure-Activity Relationship
  • Temperature
  • Thylakoids/*ultrastructure

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Damkjaer, Jakob,1976-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)jatdar04 (författare)
  • Kereïche, SamiDepartment of Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9747 AG Groningen, The Netherlands (författare)
  • Ilioaia, CristianDepartment of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom (författare)
  • Ruban, Alexander VDepartment of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom (författare)
  • Boekema, Egbert JDepartment of Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9747 AG Groningen, The Netherlands (författare)
  • Jansson, Stefan,1959-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)stja0001 (författare)
  • Horton, PeterDepartment of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom (författare)
  • Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United KingdomInstitutionen för fysiologisk botanik (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:The Plant Cell: Oxford University Press (OUP)18:11, s. 3106-201040-46511532-298X

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