6VPV image
Entry Detail
PDB ID:
6VPV
EMDB ID:
Keywords:
Title:
Trimeric Photosystem I from the High-Light Tolerant Cyanobacteria Cyanobacterium Aponinum
Biological Source:
PDB Version:
Deposition Date:
2020-02-04
Release Date:
2021-08-04
Method Details:
Experimental Method:
Resolution:
2.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A1
Chain IDs:A, L (auth: a), W (auth: 1)
Chain Length:741
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I P700 chlorophyll a apoprotein A2
Chain IDs:B, M (auth: b), X (auth: 2)
Chain Length:737
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I iron-sulfur center
Chain IDs:C, N (auth: c), Y (auth: 3)
Chain Length:80
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit II
Chain IDs:D, O (auth: d), Z (auth: 4)
Chain Length:139
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IV
Chain IDs:E, P (auth: e), AA (auth: 5)
Chain Length:68
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:PSI-F
Chain IDs:F, Q (auth: f), BA (auth: 6)
Chain Length:141
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit VIII
Chain IDs:G (auth: I), R (auth: i), CA (auth: 7)
Chain Length:38
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit IX
Chain IDs:H (auth: J), S (auth: j), DA (auth: 8)
Chain Length:39
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit PsaK
Chain IDs:I (auth: K), T (auth: k), EA (auth: 9)
Chain Length:78
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XI
Chain IDs:J (auth: L), U (auth: l), FA (auth: 0)
Chain Length:160
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Polymer Type:polypeptide(L)
Description:Photosystem I reaction center subunit XII
Chain IDs:K (auth: M), V (auth: m), GA (auth: z)
Chain Length:30
Number of Molecules:3
Biological Source:Cyanobacterium aponinum 0216
Primary Citation
The structure of photosystem I from a high-light tolerant Cyanobacteria.
Elife 10 ? ? (2021)
PMID: 34435952 DOI: 10.7554/eLife.67518

Abstact

Photosynthetic organisms have adapted to survive a myriad of extreme environments from the earth's deserts to its poles, yet the proteins that carry out the light reactions of photosynthesis are highly conserved from the cyanobacteria to modern day crops. To investigate adaptations of the photosynthetic machinery in cyanobacteria to excessive light stress, we isolated a new strain of cyanobacteria, Cyanobacterium aponinum 0216, from the extreme light environment of the Sonoran Desert. Here we report the biochemical characterization and the 2.7 Å resolution structure of trimeric photosystem I from this high-light-tolerant cyanobacterium. The structure shows a new conformation of the PsaL C-terminus that supports trimer formation of cyanobacterial photosystem I. The spectroscopic analysis of this photosystem I revealed a decrease in far-red absorption, which is attributed to a decrease in the number of long- wavelength chlorophylls. Using these findings, we constructed two chimeric PSIs in Synechocystis sp. PCC 6803 demonstrating how unique structural features in photosynthetic complexes can change spectroscopic properties, allowing organisms to thrive under different environmental stresses.

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