1z9k

Photosynthetic Reaction Center from Rhodobacter sphaeroides

Method: X-RAY DIFFRACTION

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

Reaction center protein L chain

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	Reaction center protein M chain × 1 （P02953） Reaction center protein H chain × 1 （P11846） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 UBIQUINONE-10 × 2 FE (III) ION × 1 MANGANESE (II) ION × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 6	Reaction center protein M chain × 2 （P02953） Reaction center protein H chain × 2 （P11846） BACTERIOCHLOROPHYLL A × 8 BACTERIOPHEOPHYTIN A × 4 UBIQUINONE-10 × 4 FE (III) ION × 2 MANGANESE (II) ION × 2	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 A； PDBConstruct 1–281； UniProt 1–281

Reaction center protein M chain

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	Reaction center protein L chain × 1 （P02954） Reaction center protein H chain × 1 （P11846） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 UBIQUINONE-10 × 2 FE (III) ION × 1 MANGANESE (II) ION × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 6	Reaction center protein L chain × 2 （P02954） Reaction center protein H chain × 2 （P11846） BACTERIOCHLOROPHYLL A × 8 BACTERIOPHEOPHYTIN A × 4 UBIQUINONE-10 × 4 FE (III) ION × 2 MANGANESE (II) ION × 2	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 B； PDBConstruct 1–307； UniProt 1–307

Reaction center protein H chain

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	Reaction center protein L chain × 1 （P02954） Reaction center protein M chain × 1 （P02953） BACTERIOCHLOROPHYLL A × 4 BACTERIOPHEOPHYTIN A × 2 UBIQUINONE-10 × 2 FE (III) ION × 1 MANGANESE (II) ION × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 6	Reaction center protein L chain × 2 （P02954） Reaction center protein M chain × 2 （P02953） BACTERIOCHLOROPHYLL A × 8 BACTERIOPHEOPHYTIN A × 4 UBIQUINONE-10 × 4 FE (III) ION × 2 MANGANESE (II) ION × 2	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 C； 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	1z9k
Deposition date deposition_date	2005-04-02
Structure title title	Photosynthetic Reaction Center from Rhodobacter sphaeroides
Keywords keywords	ALPHA HELIX, MEMBRANE PROTEIN, PHOTOSYNTHESIS; PHOTOSYNTHESIS
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.

1z9k__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1z9k__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1z9k__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	44.01 Å
Rg (electron density)	44.42 Å
Total Rg	44.32 Å
Atom count	13892
Residues	1642
Excluded volume	253250 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1z9k__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1z9k__assembly_2__model_1`	hexameric （6）	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 (8)

Entity 1 Entity 1 polymer

Description description	Reaction center protein L chain
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	A
Atom count atom_count	6946

ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063
Host organism host_organism	Rhodobacter sphaeroides

Entity 2 Entity 2 polymer

Description description	Reaction center protein M chain
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	B

AEYQNIFSQVQVRGPADLGMTEDVNLANRSGVGPFSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNHGMAPLN

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063
Host organism host_organism	Rhodobacter sphaeroides

Entity 3 Entity 3 polymer

Description description	Reaction center protein H chain
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	C

MVGVTAFGNFDLASLAIYSFWIFLAGLIYYLQTENMREGYPLENEDGTPAANQGPFPLPKPKTFILPHGRGTLTVPGPESEDRPIALARTAVSEGFPHAPTGDPMKDGVGPASWVARRDLPELDGHGHNKIKPMKAAAGFHVSAGKNPIGLPVRGCDLEIAGKVVDIWVDIPEQMARFLEVELKDGSTRLLPMQMVKVQSNRVHVNALSSDLFAGIPTIKSPTEVTLLEEDKICGYVAGGLMYAAPKRKSVVAAMLAEYA

Source Source

Source organism organism	Rhodobacter sphaeroides
NCBI taxonomy ID ncbi_taxonomy_id	1063
Host organism host_organism	Rhodobacter sphaeroides

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	UBIQUINONE-10
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

Entity 8 Entity 8 non-polymer

Description description	MANGANESE (II) ION
Molecular weight formula_weight	54.9 kDa
Source method src_method	syn
Copy count entity_count	1

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1z9ka1
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	d1z9kb1
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

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Unit-cell length a length_a	207.800 Å
Unit-cell length b length_b	207.800 Å
Unit-cell length c length_c	107.500 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	8

Space group space_group	P 42 2 2
Space-group number int_tables_number	93
Crystal system crystal_system	—

Resolution resolution	4.600 Å
Low-resolution limit resolution_low	25.000 Å
R factor r_factor	0.3400
R_work r_work	0.3300
R_free r_free	0.3300

Photosynthetic Reaction Center from Rhodobacter sphaeroides

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

Reaction center protein L chain

State in the Current Structure

Other States of the Same Protein in the Database

Reaction center protein M chain

State in the Current Structure

Other States of the Same Protein in the Database

Reaction center protein H chain

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

1z9k__assembly_2__model_1

1z9k__assembly_2__model_1 | I(q)

1z9k__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (8)

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

Entity 8 Entity 8 non-polymer

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)

Photosynthetic Reaction Center from Rhodobacter sphaeroides

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

Reaction center protein L chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Reaction center protein M chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Reaction center protein H chain

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

1z9k__assembly_2__model_1

1z9k__assembly_2__model_1 | I(q)

1z9k__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (8)

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

Entity 8 Entity 8 non-polymer

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (2 domains)

7. Citations (1)