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Structure paper

TitleStructural basis for the adaptation and function of chlorophyll f in photosystem I.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 238, Year 2020
Publish dateJan 13, 2020
AuthorsKoji Kato / Toshiyuki Shinoda / Ryo Nagao / Seiji Akimoto / Takehiro Suzuki / Naoshi Dohmae / Min Chen / Suleyman I Allakhverdiev / Jian-Ren Shen / Fusamichi Akita / Naoyuki Miyazaki / Tatsuya Tomo /
PubMed AbstractChlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first ...Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first found in a cyanobacterium Halomicronema hongdechloris. The location and function of Chl f in photosystems are not clear. Here we analyzed the high-resolution structures of photosystem I (PSI) core from H. hongdechloris grown under white or far-red light by cryo-electron microscopy. The structure showed that, far-red PSI binds 83 Chl a and 7 Chl f, and Chl f are associated at the periphery of PSI but not in the electron transfer chain. The appearance of Chl f is well correlated with the expression of PSI genes induced under far-red light. These results indicate that Chl f functions to harvest the far-red light and enhance uphill energy transfer, and changes in the gene sequences are essential for the binding of Chl f.
External linksNat Commun / PubMed:31932639 / PubMed Central
MethodsEM (single particle)
Resolution2.35 - 2.41 Å
Structure data

0726

6kmw

EMDB-0726, PDB-6kmw:
Structure of PSI from H. hongdechloris grown under white light condition
Method: EM (single particle) / Resolution: 2.35 Å

0727

6kmx

EMDB-0727, PDB-6kmx:
Structure of PSI from H. hongdechloris grown under far-red light condition
Method: EM (single particle) / Resolution: 2.41 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

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

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

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


ChemComp, No image

ChemComp-UNL:
Unknown ligand

ChemComp-CA:
Unknown entry

ChemComp-HOH:
WATER / Water


ChemComp, No image

ChemComp-F6C:
Chlorophyll F / Chlorophyll f

Source
  • halomicronema hongdechloris c2206 (bacteria)
  • Halomicronema hongdechloris (bacteria)
KeywordsELECTRON TRANSPORT / Photosystem I

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