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TitleCryo-EM structure of the whole photosynthetic reaction center apparatus from the green sulfur bacterium .
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 120, Issue 5, Page e2216734120, Year 2023
Publish dateJan 31, 2023
AuthorsHao Xie / Alexandros Lyratzakis / Radhika Khera / Myrto Koutantou / Sonja Welsch / Hartmut Michel / Georgios Tsiotis /
PubMed AbstractLight energy absorption and transfer are very important processes in photosynthesis. In green sulfur bacteria light is absorbed primarily by the chlorosomes and its energy is transferred via the ...Light energy absorption and transfer are very important processes in photosynthesis. In green sulfur bacteria light is absorbed primarily by the chlorosomes and its energy is transferred via the Fenna-Matthews-Olson (FMO) proteins to a homodimeric reaction center (RC). Here, we report the cryogenic electron microscopic structure of the intact FMO-RC apparatus from at 2.5 Å resolution. The FMO-RC apparatus presents an asymmetric architecture and contains two FMO trimers that show different interaction patterns with the RC core. Furthermore, the two permanently bound transmembrane subunits PscC, which donate electrons to the special pair, interact only with the two large PscA subunits. This structure fills an important gap in our understanding of the transfer of energy from antenna to the electron transport chain of this RC and the transfer of electrons from reduced sulfur compounds to the special pair.
External linksProc Natl Acad Sci U S A / PubMed:36693097 / PubMed Central
MethodsEM (single particle)
Resolution2.5 Å
Structure data

14528

7z6q

EMDB-14528, PDB-7z6q:
Cryo-EM structure of the whole photosynthetic complex from the green sulfur bacteria
Method: EM (single particle) / Resolution: 2.5 Å

Chemicals

ChemComp-GS0:
Bacteriochlorophyll A isomer

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-BCL:
BACTERIOCHLOROPHYLL A

ChemComp-F39:
[(2R,3S,4S,5R,6R)-6-[(10E,12E,14E)-2,6,10,14,19,23-hexamethyl-25-(2,3,6-trimethylphenyl)pentacosa-6,8,10,12,14,16,18,20,22,24-decaen-2-yl]oxy-3,4,5-tris(oxidanyl)oxan-2-yl]methyl dodecanoate

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-IKV:
[(2~{R})-2-hexadecanoyloxy-3-[(2~{S},3~{S},4~{R},5~{R},6~{S})-6-(hydroxymethyl)-3,4,5-tris(oxidanyl)oxan-2-yl]oxy-propyl] hexadecanoate

ChemComp-CA:
Unknown entry

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-HOH:
WATER

Source
  • chlorobaculum tepidum tls (bacteria)
KeywordsPHOTOSYNTHESIS / reaction centre / electron transport / energy transfer / green sulfur bacterium / membrane protein / light-harvesting protein complex

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