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TitleStructure of the chloroplast ribosome with chl-RRF and hibernation-promoting factor.
Journal, issue, pagesNat Plants, Vol. 4, Issue 4, Page 212-217, Year 2018
Publish dateApr 2, 2018
AuthorsAnnemarie Perez Boerema / Shintaro Aibara / Bijoya Paul / Victor Tobiasson / Dari Kimanius / Björn O Forsberg / Karin Wallden / Erik Lindahl / A Amunts /
PubMed AbstractOxygenic photosynthesis produces oxygen and builds a variety of organic compounds, changing the chemistry of the air, the sea and fuelling the food chain on our planet. The photochemical reactions ...Oxygenic photosynthesis produces oxygen and builds a variety of organic compounds, changing the chemistry of the air, the sea and fuelling the food chain on our planet. The photochemical reactions underpinning this process in plants take place in the chloroplast. Chloroplasts evolved ~1.2 billion years ago from an engulfed primordial diazotrophic cyanobacterium, and chlororibosomes are responsible for synthesis of the core proteins driving photochemical reactions. Chlororibosomal activity is spatiotemporally coupled to the synthesis and incorporation of functionally essential co-factors, implying the presence of chloroplast-specific regulatory mechanisms and structural adaptation of the chlororibosome. Despite recent structural information, some of these aspects remained elusive. To provide new insights into the structural specialities and evolution, we report a comprehensive analysis of the 2.9-3.1 Å resolution electron cryo-microscopy structure of the spinach chlororibosome in complex with its recycling factor and hibernation-promoting factor. The model reveals a prominent channel extending from the exit tunnel to the chlororibosome exterior, structural re-arrangements that lead to increased surface area for translocon binding, and experimental evidence for parallel and convergent evolution of chloro- and mitoribosomes.
External linksNat Plants / PubMed:29610536
MethodsEM (single particle)
Resolution2.9 - 3.0 Å
Structure data

3941

6eri

EMDB-3941, PDB-6eri:
Structure of the chloroplast ribosome with chl-RRF and hibernation-promoting factor
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-3942:
Structure of the chloroplast ribosome with chl-RRF and hibernation-promoting factor (Focused refinement of LSU)
Method: EM (single particle) / Resolution: 2.9 Å

EMDB-3943:
Structure of the chloroplast ribosome with chl-RRF and hibernation-promoting factor (Focused refinement of SSU)
Method: EM (single particle) / Resolution: 3.0 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

Source
  • spinacia oleracea (spinach)
  • Spinach (spinach)
KeywordsRIBOSOME / Chloroplast / translation

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