SAXSdb — 2rcr

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1. Protein Identity and Related Structures Protein Identity & Related Structures

PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT)

Rhodobacter sphaeroides

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT) × 1 （P02953） PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT) × 1 （P11846） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 Coenzyme Q10, (2Z,6E,10Z,14E,18E,22E,26Z)-isomer × 2 FE (III) ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RCEL_RHOSH
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain L； PDBConstruct 1–281； UniProt 1–281

PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT)

Rhodobacter sphaeroides

UniProt P02953

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT) × 1 （P02954） PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT) × 1 （P11846） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 Coenzyme Q10, (2Z,6E,10Z,14E,18E,22E,26Z)-isomer × 2 FE (III) ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RCEM_RHOSH
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain M； PDBConstruct 1–307； UniProt 1–307

PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT)

Rhodobacter sphaeroides

UniProt P11846

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT) × 1 （P02954） PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT) × 1 （P02953） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 Coenzyme Q10, (2Z,6E,10Z,14E,18E,22E,26Z)-isomer × 2 FE (III) ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RCEH_RHOSH
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain H； PDBConstruct 1–260； UniProt 1–260

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	2rcr
Deposition date deposition_date	1991-02-04
Structure title title	STRUCTURE OF THE MEMBRANE-BOUND PROTEIN PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES
Keywords keywords	PHOTOSYNTHETIC REACTION CENTER; PHOTOSYNTHETIC REACTION CENTER
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

2rcr__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2rcr__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2rcr__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	30.36 Å
Rg (electron density)	29.01 Å
Total Rg	29.94 Å
Atom count	7049
Residues	838
Excluded volume	128490 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2rcr__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Description description	PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT)
Molecular weight formula_weight	31346.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L
Atom count atom_count	7049

ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063

Entity 2 Entity 2 polymer

Description description	PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT)
Molecular weight formula_weight	34398.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M

AEYQNIFSQVQVRGPADLGMTEDVNLANRSGVGPFSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNHGMAPLN

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063

Entity 3 Entity 3 polymer

Description description	PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT)
Molecular weight formula_weight	28066.3 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H

MVGVTAFGNFDLASLAIYSFWIFLAGLIYYLQTENMREGYPLENEDGTPAANQGPFPLPKPKTFILPHGRGTLTVPGPESEDRPIALARTAVSEGFPHAPTGDPMKDGVGPASWVARRDLPELDGHGHNKIKPMKAAAGFHVSAGKNPIGLPVRGCDLEIAGKVVDIWVDIPEQMARFLEVELKDGSTRLLPMQMVKVQSNRVHVNALSSDLFAGIPTIKSPTEVTLLEEDKICGYVAGGLMYAAPKRKSVVAAMLAEYA

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063

Entity 4 Entity 4 non-polymer

Description description	BACTERIOCHLOROPHYLL A
Molecular weight formula_weight	911.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	BACTERIOPHEOPHYTIN A
Molecular weight formula_weight	889.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 6 Entity 6 non-polymer

Description description	Coenzyme Q10, (2Z,6E,10Z,14E,18E,22E,26Z)-isomer
Molecular weight formula_weight	863.3 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 7 Entity 7 non-polymer

Description description	FE (III) ION
Molecular weight formula_weight	55.8 kDa
Source method src_method	syn
Copy count entity_count	1

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2rcrh1
Class class	b — All beta proteins
Fold Fold fold	b.41 — PRC-barrel domain
Superfamily Superfamily superfamily	b.41.1 — PRC-barrel domain
Family Family family	b.41.1.1 — Photosynthetic reaction centre, H-chain, cytoplasmic domain

Domain ID domain_id	d2rcrh2
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.10 — Photosystem II reaction centre subunit H, transmembrane region
Family Family family	f.23.10.1 — Photosystem II reaction centre subunit H, transmembrane region

Domain ID domain_id	d2rcrl_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.26 — Bacterial photosystem II reaction centre, L and M subunits
Superfamily Superfamily superfamily	f.26.1 — Bacterial photosystem II reaction centre, L and M subunits
Family Family family	f.26.1.1 — Bacterial photosystem II reaction centre, L and M subunits

Domain ID domain_id	d2rcrm_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.26 — Bacterial photosystem II reaction centre, L and M subunits
Superfamily Superfamily superfamily	f.26.1 — Bacterial photosystem II reaction centre, L and M subunits
Family Family family	f.26.1.1 — Bacterial photosystem II reaction centre, L and M subunits

CATH v4.4 (6 domains)

Domain ID domain_id	2rcrH01
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	540 — Photosynthetic Reaction Center; Chain H, domain 1
Homologous superfamily homologous superfamily	10 — Photosynthetic reaction centre, H subunit, N-terminal domain

Domain ID domain_id	2rcrH02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	50 — Photosynthetic Reaction Center; Chain H, domain 2
Homologous superfamily homologous superfamily	10 — Photosynthetic Reaction Center, subunit H, domain 2

Domain ID domain_id	2rcrL01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	85 — Photosynthetic Reaction Center, subunit M; domain 1
Homologous superfamily homologous superfamily	10 — Photosystem II protein D1-like

Domain ID domain_id	2rcrL02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	85 — Photosynthetic Reaction Center, subunit M; domain 1
Homologous superfamily homologous superfamily	10 — Photosystem II protein D1-like

Domain ID domain_id	2rcrM01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	85 — Photosynthetic Reaction Center, subunit M; domain 1
Homologous superfamily homologous superfamily	10 — Photosystem II protein D1-like

Domain ID domain_id	2rcrM02
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	85 — Photosynthetic Reaction Center, subunit M; domain 1
Homologous superfamily homologous superfamily	10 — Photosystem II protein D1-like

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Unit-cell length a length_a	142.200 Å
Unit-cell length b length_b	139.600 Å
Unit-cell length c length_c	78.700 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	3.100 Å
Low-resolution limit resolution_low	— Å
R factor r_factor	0.2200
R_work r_work	—
R_free r_free	—

STRUCTURE OF THE MEMBRANE-BOUND PROTEIN PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES

1. Protein Identity and Related Structures Protein Identity & Related Structures

PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

2rcr__assembly_1__model_1

2rcr__assembly_1__model_1 | I(q)

2rcr__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (4 domains)

CATH v4.4 (6 domains)

7. Citations (2)

STRUCTURE OF THE MEMBRANE-BOUND PROTEIN PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES

1. Protein Identity and Related Structures Protein Identity & Related Structures

PHOTOSYNTHETIC REACTION CENTER (L SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

PHOTOSYNTHETIC REACTION CENTER (M SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

PHOTOSYNTHETIC REACTION CENTER (H SUBUNIT)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

2rcr__assembly_1__model_1

2rcr__assembly_1__model_1 | I(q)

2rcr__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (4 domains)

CATH v4.4 (6 domains)

7. Citations (2)