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TitleArchitectures of photosynthetic RC-LH1 supercomplexes from .
Journal, issue, pagesSci Adv, Vol. 10, Issue 41, Page eadp6678, Year 2024
Publish dateOct 11, 2024
AuthorsPeng Wang / Bern M Christianson / Deniz Ugurlar / Ruichao Mao / Yi Zhang / Ze-Kun Liu / Ying-Yue Zhang / Adrian M Gardner / Jun Gao / Yu-Zhong Zhang / Lu-Ning Liu /
PubMed AbstractThe reaction center-light-harvesting complex 1 (RC-LH1) plays an essential role in the primary reactions of bacterial photosynthesis. Here, we present high-resolution structures of native monomeric ...The reaction center-light-harvesting complex 1 (RC-LH1) plays an essential role in the primary reactions of bacterial photosynthesis. Here, we present high-resolution structures of native monomeric and dimeric RC-LH1 supercomplexes from () using cryo-electron microscopy. The RC-LH1 monomer is composed of an RC encircled by an open LH1 ring comprising 15 αβ heterodimers and a PufX transmembrane polypeptide. In the RC-LH1 dimer, two crossing PufX polypeptides mediate dimerization. Unlike counterpart, RC-LH1 dimer has a less bent conformation, lacks the PufY subunit near the LH1 opening, and includes two extra LH1 αβ subunits, forming a more enclosed S-shaped LH1 ring. Spectroscopic assays reveal that these unique structural features are accompanied by changes in the kinetics of quinone/quinol trafficking between RC-LH1 and cytochrome . Our findings reveal the assembly principles and structural variability of photosynthetic RC-LH1 supercomplexes, highlighting diverse strategies used by phototrophic bacteria to optimize light-harvesting and electron transfer in competitive environments.
External linksSci Adv / PubMed:39383221 / PubMed Central
MethodsEM (single particle)
Resolution2.6 - 2.84 Å
Structure data

39244

8ygd

EMDB-39244, PDB-8ygd:
Rhodobacter blasticus RC-LH1 dimer
Method: EM (single particle) / Resolution: 2.84 Å

39255

8ygl

EMDB-39255, PDB-8ygl:
Rhodobacter blasticus RC-LH1 monomer
Method: EM (single particle) / Resolution: 2.6 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A

ChemComp-SPO:
SPHEROIDENE

ChemComp-PC1:
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / phospholipid*YM

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM

ChemComp-BPH:
BACTERIOPHEOPHYTIN A

ChemComp-U10:
UBIQUINONE-10

ChemComp-FE2:
Unknown entry

Source
  • fuscovulum blasticum dsm 2131 (bacteria)
KeywordsPHOTOSYNTHESIS / light-harvesting complex

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