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Structure paper

TitleThe structure of the Physcomitrium patens photosystem I reveals a unique Lhca2 paralogue replacing Lhca4.
Journal, issue, pagesNat Plants, Vol. 8, Issue 3, Page 307-316, Year 2022
Publish dateFeb 21, 2022
AuthorsC Gorski / R Riddle / H Toporik / Z Da / Z Dobson / D Williams / Y Mazor /
PubMed AbstractThe moss Physcomitrium patens diverged from green algae shortly after the colonization of land by ancient plants. This colonization posed new environmental challenges, which drove evolutionary ...The moss Physcomitrium patens diverged from green algae shortly after the colonization of land by ancient plants. This colonization posed new environmental challenges, which drove evolutionary processes. The photosynthetic machinery of modern flowering plants is adapted to the high light conditions on land. Red-shifted Lhca4 antennae are present in the photosystem I light-harvesting complex of many green-lineage plants but absent in P. patens. The cryo-EM structure of the P. patens photosystem I light-harvesting complex I supercomplex (PSI-LHCI) at 2.8 Å reveals that Lhca4 is replaced by a unique Lhca2 paralogue in moss. This PSI-LHCI supercomplex also retains the PsaM subunit, present in Cyanobacteria and several algal species but lost in vascular plants, and the PsaO subunit responsible for binding light-harvesting complex II. The blue-shifted Lhca2 paralogue and chlorophyll b enrichment relative to flowering plants make the P. patens PSI-LHCI spectroscopically unique among other green-lineage supercomplexes. Overall, the structure represents an evolutionary intermediate PSI with the crescent-shaped LHCI common in vascular plants, and contains a unique Lhca2 paralogue that facilitates the moss's adaptation to low-light niches.
External linksNat Plants / PubMed:35190662
MethodsEM (single particle)
Resolution2.8 - 3.76 Å
Structure data

23023

7ksq

EMDB-23023, PDB-7ksq:
The Structure of the moss PSI-LHCI reveals the evolution of the LHCI antenna
Method: EM (single particle) / Resolution: 2.8 Å

23034

7ku5

EMDB-23034, PDB-7ku5:
The Structure of the moss PSI-LHCI reveals the evolution of the LHCI antenna
Method: EM (single particle) / Resolution: 3.76 Å

23040

7kux

EMDB-23040, PDB-7kux:
The Structure of the moss PSI-LHCI reveals the evolution of the LHCI antenna
Method: EM (single particle) / Resolution: 2.8 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-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

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

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-CHL:
CHLOROPHYLL B / Chlorophyll b

ChemComp-LUT:
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / Lutein

ChemComp-HOH:
WATER / Water

Source
  • physcomitrium patens (plant)
KeywordsPHOTOSYNTHESIS / PSI / electron transport / chlorophyll / Antenna / light harvesting / membrane protein

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