8WGH image
Entry Detail
PDB ID:
8WGH
EMDB ID:
Keywords:
Title:
Cryo-EM structure of the red-shifted Fittonia albivenis PSI-LHCI
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-09-21
Release Date:
2024-07-10
Method Details:
Experimental Method:
Resolution:
2.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein 1
Chain IDs:A (auth: 1)
Chain Length:246
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein 2
Chain IDs:B (auth: 2)
Chain Length:265
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein 3
Chain IDs:C (auth: 3)
Chain Length:272
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein 4
Chain IDs:D (auth: 4)
Chain Length:248
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A1
Chain IDs:E (auth: A)
Chain Length:750
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A2
Chain IDs:F (auth: B)
Chain Length:734
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I iron-sulfur center
Chain IDs:G (auth: C)
Chain Length:81
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit II
Chain IDs:H (auth: D)
Chain Length:190
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IV
Chain IDs:I (auth: E)
Chain Length:151
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit III, chloroplastic
Chain IDs:J (auth: F)
Chain Length:221
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VIII
Chain IDs:K (auth: G)
Chain Length:145
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VI
Chain IDs:L (auth: H)
Chain Length:145
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VIII
Chain IDs:M (auth: I)
Chain Length:36
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IX
Chain IDs:N (auth: J)
Chain Length:44
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit psaK
Chain IDs:O (auth: K)
Chain Length:132
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XI
Chain IDs:P (auth: L)
Chain Length:217
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit N
Chain IDs:Q (auth: N)
Chain Length:173
Number of Molecules:1
Biological Source:Fittonia albivenis
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit O
Chain IDs:R (auth: O)
Chain Length:144
Number of Molecules:1
Biological Source:Fittonia albivenis
Primary Citation
Structure of the red-shifted Fittonia albivenis photosystem I.
Nat Commun 15 6325 6325 (2024)
PMID: 39060282 DOI: 10.1038/s41467-024-50655-9

Abstact

Photosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI-light harvesting complex I (LHCI) supercomplex from F. albivenis at 2.46-Å resolution using cryo-electron microscopy. The supercomplex contains a core complex of 14 subunits and an LHCI belt with four antenna subunits (Lhca1-4) similar to previously reported angiosperm PSI-LHCI structures; however, Lhca3 differs in three regions surrounding a dimer of low-energy chlorophylls (Chls) termed red Chls, which absorb far-red beyond visible light. The unique amino acid sequences within these regions are exclusively shared by plants with strongly red-shifted fluorescence emission, suggesting candidate structural elements for regulating the energy state of red Chls. These results provide a structural basis for unraveling the mechanisms of light harvest and transfer in PSI-LHCI of under canopy plants and for designing Lhc to harness longer-wavelength light in the far-red spectral range.

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