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TitleA unique photosystem I reaction center from a chlorophyll d-containing cyanobacterium Acaryochloris marina.
Journal, issue, pagesJ Integr Plant Biol, Vol. 63, Issue 10, Page 1740-1752, Year 2021
Publish dateJun 24, 2021
AuthorsCaihuang Xu / Qingjun Zhu / Jing-Hua Chen / Liangliang Shen / Xiaohan Yi / Zihui Huang / Wenda Wang / Min Chen / Tingyun Kuang / Jian-Ren Shen / Xing Zhang / Guangye Han /
PubMed AbstractPhotosystem I (PSI) is a large protein supercomplex that catalyzes the light-dependent oxidation of plastocyanin (or cytochrome c ) and the reduction of ferredoxin. This catalytic reaction is ...Photosystem I (PSI) is a large protein supercomplex that catalyzes the light-dependent oxidation of plastocyanin (or cytochrome c ) and the reduction of ferredoxin. This catalytic reaction is realized by a transmembrane electron transfer chain consisting of primary electron donor (a special chlorophyll (Chl) pair) and electron acceptors A , A , and three Fe S clusters, F , F , and F . Here we report the PSI structure from a Chl d-dominated cyanobacterium Acaryochloris marina at 3.3 Å resolution obtained by single-particle cryo-electron microscopy. The A. marina PSI exists as a trimer with three identical monomers. Surprisingly, the structure reveals a unique composition of electron transfer chain in which the primary electron acceptor A is composed of two pheophytin a rather than Chl a found in any other well-known PSI structures. A novel subunit Psa27 is observed in the A. marina PSI structure. In addition, 77 Chls, 13 α-carotenes, two phylloquinones, three Fe-S clusters, two phosphatidyl glycerols, and one monogalactosyl-diglyceride were identified in each PSI monomer. Our results provide a structural basis for deciphering the mechanism of photosynthesis in a PSI complex with Chl d as the dominating pigments and absorbing far-red light.
External linksJ Integr Plant Biol / PubMed:34002536
MethodsEM (single particle)
Resolution3.3 Å
Structure data

30882

7dwq

EMDB-30882, PDB-7dwq:
Photosystem I from a chlorophyll d-containing cyanobacterium Acaryochloris marina
Method: EM (single particle) / Resolution: 3.3 Å

Chemicals

ChemComp-CL7:
CHLOROPHYLL D

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

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

ChemComp-G9R:
CHLOROPHYLL D ISOMER

ChemComp-PHO:
PHEOPHYTIN A

ChemComp-8CT:
(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene

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

Source
  • acaryochloris marina mbic11017 (bacteria)
  • acaryochloris marinan mbic11017 (bacteria)
  • acaryochloris marina mbic 11017 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem I / reaction center / cryo-EM / cyanobacteria

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