8XLP image
Entry Detail
PDB ID:
8XLP
EMDB ID:
Keywords:
Title:
Structure of inactive Photosystem II associated with CAC antenna from Rhodomonas Salina
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-12-26
Release Date:
2024-07-31
Method Details:
Experimental Method:
Resolution:
2.57 Å
Aggregation State:
3D ARRAY
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CAC1
Chain IDs:NA (auth: 1), TA (auth: N)
Chain Length:233
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:CAC2
Chain IDs:HA (auth: 2), OA (auth: O)
Chain Length:217
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:CAC3
Chain IDs:IA (auth: 3), PA (auth: P)
Chain Length:221
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:CAC4
Chain IDs:JA (auth: 4), QA (auth: Q)
Chain Length:216
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:CAC5
Chain IDs:KA (auth: 5), RA (auth: R)
Chain Length:229
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:CAC6
Chain IDs:LA (auth: 6), SA (auth: S)
Chain Length:227
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II protein D1
Chain IDs:A (auth: a), R (auth: A)
Chain Length:328
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II CP47 reaction center protein
Chain IDs:B (auth: b), S (auth: B)
Chain Length:509
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II CP43 reaction center protein
Chain IDs:C (auth: c), T (auth: C)
Chain Length:487
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II D2 protein
Chain IDs:D (auth: d), U (auth: D)
Chain Length:351
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Cytochrome b559 subunit alpha
Chain IDs:E (auth: e), V (auth: E)
Chain Length:84
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Cytochrome b559 subunit beta
Chain IDs:F (auth: f), W (auth: F)
Chain Length:42
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:NCP
Chain IDs:Q (auth: g), MA (auth: G)
Chain Length:284
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein H
Chain IDs:G (auth: h), X (auth: H)
Chain Length:67
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein I
Chain IDs:H (auth: i), Y (auth: I)
Chain Length:38
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein K
Chain IDs:I (auth: k), Z (auth: K)
Chain Length:45
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein L
Chain IDs:J (auth: l), AA (auth: L)
Chain Length:38
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II protein M
Chain IDs:K (auth: m), BA (auth: M)
Chain Length:40
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein T
Chain IDs:L (auth: t), CA (auth: T)
Chain Length:32
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II protein W
Chain IDs:M (auth: w), DA (auth: W)
Chain Length:74
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center X protein
Chain IDs:N (auth: x), EA (auth: X)
Chain Length:39
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein Psb30
Chain IDs:O (auth: y), FA (auth: Y)
Chain Length:34
Number of Molecules:2
Biological Source:Rhodomonas salina
Polymer Type:polypeptide(L)
Description:Photosystem II reaction center protein Z
Chain IDs:P (auth: z), GA (auth: Z)
Chain Length:62
Number of Molecules:2
Biological Source:Rhodomonas salina
Primary Citation
Structural basis for the distinct core-antenna assembly of cryptophyte photosystem II.
Nat Commun 15 6812 6812 (2024)
PMID: 39122741 DOI: 10.1038/s41467-024-51206-y

Abstact

Photosystem II (PSII) catalyzes the light-driven charge separation and water oxidation reactions of photosynthesis. Eukaryotic PSII core is usually associated with membrane-embedded light-harvesting antennae, which greatly increase the absorbance cross-section of the core. The peripheral antennae in different phototrophs vary considerably in protein composition and arrangement. Photosynthetic cryptophytes possess chlorophyll a/c binding proteins (CACs) that serve as their antennae. How these CACs assemble with the PSII core remains unclear. Here, we report the 2.57-Å resolution structure of cryptophyte PSII-CAC purified from cells at nitrogen-limited stationary growth phase. We show that each monomer of the PSII homodimer contains a core complex, six chlorophyll a/c binding proteins (CACs) and a previously unseen chlorophyll-binding protein (termed CAL-II). Six CACs are arranged as a double-layered arc-shaped non-parallel belt, and two such belts attach to the dimeric core from opposite sides. The CAL-II simultaneously interacts with a number of core subunits and five CACs. The distinct organization of CACs and the presence of CAL-II may play a critical role in stabilizing the dimeric PSII-CAC complex under stress conditions. Our study provides mechanistic insights into the assembly and function of the PSII-CAC complex as well as the possible adaptation of cryptophytes in response to environmental stresses.

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