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TitleArchitecture of the photosynthetic complex from a green sulfur bacterium.
Journal, issue, pagesScience, Vol. 370, Issue 6519, Year 2020
Publish dateNov 20, 2020
AuthorsJing-Hua Chen / Hangjun Wu / Caihuang Xu / Xiao-Chi Liu / Zihui Huang / Shenghai Chang / Wenda Wang / Guangye Han / Tingyun Kuang / Jian-Ren Shen / Xing Zhang /
PubMed AbstractThe photosynthetic apparatus of green sulfur bacteria (GSB) contains a peripheral antenna chlorosome, light-harvesting Fenna-Matthews-Olson proteins (FMO), and a reaction center (GsbRC). We used cryo- ...The photosynthetic apparatus of green sulfur bacteria (GSB) contains a peripheral antenna chlorosome, light-harvesting Fenna-Matthews-Olson proteins (FMO), and a reaction center (GsbRC). We used cryo-electron microscopy to determine a 2.7-angstrom structure of the FMO-GsbRC supercomplex from The GsbRC binds considerably fewer (bacterio)chlorophylls [(B)Chls] than other known type I RCs do, and the organization of (B)Chls is similar to that in photosystem II. Two BChl layers in GsbRC are not connected by Chls, as seen in other RCs, but associate with two carotenoid derivatives. Relatively long distances of 22 to 33 angstroms were observed between BChls of FMO and GsbRC, consistent with the inefficient energy transfer between these entities. The structure contains common features of both type I and type II RCs and provides insight into the evolution of photosynthetic RCs.
External linksScience / PubMed:33214250
MethodsEM (single particle)
Resolution2.7 Å
Structure data

30069

6m32

EMDB-30069, PDB-6m32:
Cryo-EM structure of FMO-RC complex from green sulfur bacteria
Method: EM (single particle) / Resolution: 2.7 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A / Bacteriochlorophyll

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

ChemComp-GS0:
Bacteriochlorophyll A isomer

ChemComp-F26:
2-[(1E,3E,5E,7E,9E,11E,13E,15E,17E,19E)-3,7,12,16,20,24-hexamethylpentacosa-1,3,5,7,9,11,13,15,17,19,23-undecaenyl]-1,3,4-trimethyl-benzene

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 / Phosphatidylglycerol

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-CA:
Unknown entry

ChemComp-G2O:
Chlorophyll A ester

Source
  • chlorobaculum tepidum (strain atcc 49652 / dsm 12025 / nbrc 103806 / tls) (bacteria)
  • chlorobaculum tepidum tls (bacteria)
KeywordsPHOTOSYNTHESIS / Photosynthetic reaction center / Green sulfur bacteria / Energy transfer

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