photosynthetic membrane

GO:0034357 · Membrane organelle · Membrane · Proposed

A membrane enriched in complexes formed of reaction centers, accessory pigments and electron carriers, in which photosynthetic reactions take place. [GO:0034357]

UniProt location names: UniProt Consortium, CC BY 4.0. Reference label and route sources.

Components

Component	Type	Part of / acts on	Grounding	Essential	Role
photosynthetic lipid bilayer	Lipid	part of	Reviewed label only (reviewed name; no accession asserted)	ESSENTIAL	Membrane lipid matrix that embeds photosynthetic pigment-protein complexes and separates aqueous phases so light-driven electron flow can build an electrochemical proton gradient. `GO:0034357` GO defines photosynthetic membranes as membranes in which photosynthetic reactions take place. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review the lipid-containing thylakoid membranes of cyanobacteria, algae and plants. `DOI:10.1016/S0006-3495(02)75470-2` Feniouk et al. 2002 assayed light-driven ATP synthesis across sealed Rhodobacter capsulatus chromatophore vesicle membranes.
photosynthetic reaction center complexes	Protein complex	part of	Reviewed label only (reviewed name; no accession asserted)	ESSENTIAL	Pigment-protein complexes that carry the primary photochemistry of photosynthesis by converting excitation energy into charge separation within the membrane. `GO:0034357` GO includes reaction centers in the definition of a photosynthetic membrane. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review photosystem I and photosystem II reaction centers as major thylakoid membrane complexes. `DOI:10.1038/nature02823` Bahatyrova et al. 2004 imaged dimeric reaction-center LH1-PufX core complexes in native purple-bacterial photosynthetic membranes.
accessory antenna pigments	Small molecule	part of	Reviewed label only (reviewed name; no accession asserted)	ESSENTIAL	Light-absorbing cofactors that broaden spectral capture and route excitation energy toward reaction-center complexes. `GO:0034357` GO includes accessory pigments in the definition of a photosynthetic membrane. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review pigment-bearing photosystems and antennae in thylakoid membranes. `DOI:10.1038/nature02823` Bahatyrova et al. 2004 resolved bacteriochlorophyll-rich LH2 antenna complexes interconnecting purple-bacterial reaction-center arrays. `DOI:10.1146/annurev-biophys-062920-063657` Sui 2021 reviewed phycobilin chromophores carried by cyanobacterial phycobilisome light-harvesting complexes.
light-harvesting complex	Protein complex	part of	`GO:0030076`	UNKNOWN	Protein-pigment antenna complexes that bind accessory pigments and deliver excitation energy to photosynthetic reaction centers. `GO:0030076` GO defines light-harvesting complexes as protein-pigment complexes that harvest radiant energy and transfer it to reaction centers. `DOI:10.1146/annurev-biophys-062920-063657` Sui 2021 reviewed membrane-associated cyanobacterial phycobilisome antennae. `DOI:10.1038/nature02823` Bahatyrova et al. 2004 imaged LH2 light-harvesting complexes around reaction-center LH1-PufX cores in native purple-bacterial photosynthetic membranes.
photosynthetic membrane electron carriers	Small molecule	part of	Reviewed label only (reviewed name; no accession asserted)	ESSENTIAL	Membrane-associated quinone pools and carrier cofactors that shuttle redox equivalents between photosynthetic reaction centers and quinol-oxidizing cytochrome complexes. `GO:0034357` GO includes electron carriers in the definition of a photosynthetic membrane. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review plastoquinone-mediated electron transfer between PSII and cytochrome b6f in thylakoid membranes. `DOI:10.1074/jbc.M412088200` Comayras et al. 2005 modeled quinone traffic between reaction centers and cytochrome bc1 in Rhodobacter sphaeroides chromatophore membranes.
photosynthetic quinol:cytochrome complexes	Protein complex	part of	Reviewed label only (reviewed name; no accession asserted)	UNKNOWN	Quinol-oxidizing membrane protein complexes that couple photosynthetic electron flow through quinone carriers to proton translocation and downstream carrier reduction. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 place cytochrome b6f between PSII, plastoquinone and PSI in the thylakoid electron-transport chain. `DOI:10.1074/jbc.M412088200` Comayras et al. 2005 analyzed quinone traffic between reaction centers and cytochrome bc1 in Rhodobacter sphaeroides chromatophore membranes.

Taxonomic distribution

NCBITaxon:1117 Cyanobacteriota — COMMON: Most cyanobacteria use thylakoid photosynthetic membranes for oxygenic light reactions; Gloeobacter-like lineages are the major exception because they photosynthesize at the plasma membrane. [DOI:10.1146/annurev-cellbio-120823-022747]
NCBITaxon:2 Bacteria — VARIABLE: Photosynthetic membranes occur in phototrophic bacterial clades, including cyanobacterial thylakoids and the chromatophore membranes of purple photosynthetic bacteria. [DOI:10.1038/nature02823]

Canonical examples

NCBITaxon:1148 Synechocystis sp. PCC 6803 — Cyanobacterial model whose thylakoid photosynthetic membranes have been used to map native photosystem organization. [DOI:10.1016/j.molp.2017.09.019]
NCBITaxon:1063 Cereibacter sphaeroides — Purple photosynthetic bacterium whose native chromatophore photosynthetic membrane architecture was resolved by atomic force microscopy. [DOI:10.1038/nature02823]

Functions

photosynthetic electron transport chain GO:0009767 — Photosynthetic membranes organize light-harvesting antennae, reaction-center complexes, quinone carriers and quinol-oxidizing cytochrome complexes so illumination drives membrane electron transport and proton-motive-force generation.
- GO:0034357 GO defines photosynthetic membranes as the membrane site where photosynthetic reactions take place.
- DOI:10.1146/annurev-cellbio-120823-022747 Perez-Boerema et al. 2024 review the thylakoid membrane electron-transport chain.
- DOI:10.1074/jbc.M412088200 Comayras et al. 2005 analyzed quinone-linked cyclic electron transport in Rhodobacter chromatophore membranes.
photosynthesis, light reaction GO:0019684 — The membrane-localized pigment and carrier network supports light capture, charge separation and energy conversion during the light reactions of photosynthesis.
- DOI:10.1146/annurev-cellbio-120823-022747 Perez-Boerema et al. 2024 review thylakoid membranes as the site of oxygenic photosynthetic light reactions.
- DOI:10.1038/nature02823 Bahatyrova et al. 2004 resolved the purple-bacterial chromatophore membrane that contains reaction-center and light-harvesting complexes.

Mechanism graphs

Photosynthetic membranes couple light absorption to membrane electron flow (FUNCTION)

Light-harvesting complexes, reaction-center complexes, quinone carriers and quinol-oxidizing cytochrome complexes are embedded in or associated with a photosynthetic lipid bilayer, enabling light reactions that drive photosynthetic electron transport and proton-gradient formation.

Subject	Predicate	Object	Evidence
accessory antenna pigments	are bound by	light-harvesting complex	`GO:0030076` GO defines light-harvesting complexes as protein-pigment complexes. `DOI:10.1146/annurev-biophys-062920-063657` Sui 2021 reviewed phycobilin chromophores attached to phycobiliproteins in phycobilisome antennae.
light-harvesting complex	capture excitation for	photosynthetic reaction center complexes	`GO:0030076` GO defines light-harvesting complexes by radiant-energy harvest and transfer to reaction centers. `DOI:10.1038/nature02823` Bahatyrova et al. 2004 imaged LH2 antennae around purple-bacterial RC-LH1-PufX cores.
photosynthetic reaction center complexes	reside in	photosynthetic membrane	`GO:0034357` GO defines photosynthetic membranes by their enrichment in reaction centers. `DOI:10.1016/j.molp.2017.09.019` Casella et al. 2017 mapped photosystems in native Synechocystis thylakoid membranes.
photosynthetic reaction center complexes	feed electrons to	photosynthetic membrane electron carriers	`DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review plastoquinone reduction by thylakoid PSII. `DOI:10.1074/jbc.M412088200` Comayras et al. 2005 analyzed quinone exchange between RC-LH1-PufX cores and cytochrome bc1.
photosynthetic membrane electron carriers	feed electrons to	photosynthetic quinol:cytochrome complexes	`DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 place cytochrome b6f downstream of plastoquinol in the thylakoid chain. `DOI:10.1074/jbc.M412088200` Comayras et al. 2005 modeled quinone traffic to cytochrome bc1 in Rhodobacter chromatophores.
photosynthetic quinol:cytochrome complexes	contribute to	transmembrane proton motive force	`DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 describe cytochrome b6f as a proton-gradient-generating thylakoid complex. `DOI:10.1016/S0006-3495(02)75470-2` Feniouk et al. 2002 measured proton-motive-force driven ATP synthesis across chromatophore membranes.
photosynthetic membrane	supports	photosynthetic electron transport chain	`GO:0034357` GO defines photosynthetic membranes as the membrane site of photosynthetic reactions. `DOI:10.1146/annurev-cellbio-120823-022747` Perez-Boerema et al. 2024 review thylakoid electron transport.

Discussions

CURATION_TODO (OPEN): Resolve exact source-neutral CURIEs for oxygenic PSI/PSII and anoxygenic reaction-center subclasses before splitting the broad reaction-center component. GO:0034357 spans multiple membrane systems whose photochemical cores are not all instances of the same lower-level complex term.
CURATION_TODO (OPEN): Resolve how far to project membrane parthood for LH2 rings, phycobilisomes and chlorosome baseplates before adding lineage-specific antenna rows under photosynthetic membranes. Purple-bacterial LH2 complexes are integral chromatophore membrane complexes, whereas cyanobacterial phycobilisomes and green-bacterial chlorosome antennae can be peripherally attached to a photosynthetic membrane or baseplate rather than embedded in the bilayer itself.
CURATION_TODO (OPEN): Keep ATP synthases out of this broad photosynthetic-membrane definition unless a child membrane record explicitly includes them as part of the same curated membrane system. Thylakoid and chromatophore membranes both maintain proton motive force for ATP synthesis, but GO:0034357 is defined by reaction centers, accessory pigments and electron carriers rather than by the downstream ATP synthase.

Evidence

GO:0034357 Gene Ontology cellular-component term for a photosynthetic membrane.
GO:0016020 Gene Ontology cellular-component term for the broader membrane class.
GO:0042651 Gene Ontology cellular-component term for the thylakoid membrane child class.
GO:0042717 Gene Ontology cellular-component term for the plasma membrane-derived chromatophore membrane child class.
GO:0030076 Gene Ontology cellular-component term for the light-harvesting protein-pigment complexes associated with photosynthetic membranes.
GO:0009767 Gene Ontology biological-process term for the photosynthetic electron transport chain.
GO:0019684 Gene Ontology biological-process term for photosynthesis, light reaction.
DOI:10.1146/annurev-cellbio-120823-022747 Perez-Boerema et al. 2024, Evolution of Thylakoid Structural Diversity, Annual Review of Cell and Developmental Biology.
DOI:10.1016/j.molp.2017.09.019 Casella et al. 2017, Dissecting the Native Architecture and Dynamics of Cyanobacterial Photosynthetic Machinery, Molecular Plant.
DOI:10.1038/nature02823 Bahatyrova et al. 2004, The native architecture of a photosynthetic membrane, Nature.
DOI:10.1146/annurev-biophys-062920-063657 Sui 2021, Structure of Phycobilisomes, Annual Review of Biophysics.
DOI:10.1074/jbc.M412088200 Comayras, Jungas and Lavergne 2005, Functional Consequences of the Organization of the Photosynthetic Apparatus in Rhodobacter sphaeroides, Journal of Biological Chemistry.
DOI:10.1016/S0006-3495(02)75470-2 Feniouk et al. 2002, Chromatophore vesicles of Rhodobacter capsulatus contain on average one F0F1-ATP synthase each, Biophysical Journal.

Curation history

2026-09-16T02:03:32Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-16T02:05:03Z codex · EXPANDED_RECORD — Added membrane parentage, broad reaction-center, antenna-pigment, electron-carrier and lipid components, cyanobacterial and purple-bacterial scope, photosynthetic light-reaction functions and evidence, a nonmechanistic membrane energy-conversion graph, and component-boundary TODOs.
2026-09-16T02:17:12Z codex · REVIEW_FIXES — Addressed PR #1050 review issues #1051 and #1052 by adding light-harvesting protein-pigment complexes, adding quinol-oxidizing cytochrome complexes, and routing the broad energy-conversion graph through those missing antenna and electron-transfer layers.

Source: data/structures/membrane_organelle/photosynthetic_membrane.yaml