SAXSdb — 3zpn

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

PHOTOSYSTEM II REACTION CENTER PSB28 PROTEIN

THERMOSYNECHOCOCCUS ELONGATUS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSB28_THEEB
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 19–133； UniProt 2–116 Author chain B； PDBConstruct 19–133； UniProt 2–116 Author chain C； PDBConstruct 19–133； UniProt 2–116 Author chain D； PDBConstruct 19–133； UniProt 2–116

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	3zpn
Deposition date deposition_date	2013-02-28
Structure title title	Structure of Psb28
Keywords keywords	PHOTOSYNTHESIS, PHOTOSYSTEM II ASSEMBLY; 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.

3zpn__assembly_1__model_1

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

Download this curve (.dat)

3zpn__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3zpn__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	19.21 Å
Rg (electron density)	18.18 Å
Total Rg	19.12 Å
Atom count	1717
Residues	215
Excluded volume	30212 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3zpn__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3zpn__assembly_2__model_1`	dimeric （2）	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 (2)

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6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	3zpnA00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	220 — Photosystem II Psb28

Domain ID domain_id	3zpnB00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	220 — Photosystem II Psb28

Domain ID domain_id	3zpnC00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	220 — Photosystem II Psb28

Domain ID domain_id	3zpnD00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	220 — Photosystem II Psb28

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Unit-cell length a length_a	57.060 Å
Unit-cell length b length_b	57.060 Å
Unit-cell length c length_c	183.320 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	16

Space group space_group	P 43
Space-group number int_tables_number	78
Crystal system crystal_system	—

Resolution resolution	2.361 Å
Low-resolution limit resolution_low	57.060 Å
R factor r_factor	0.1945
R_work r_work	0.1925
R_free r_free	0.2342

Description description	PHOTOSYSTEM II REACTION CENTER PSB28 PROTEIN
Molecular weight formula_weight	15085.9 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	3466

Structure of Psb28

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

PHOTOSYSTEM II REACTION CENTER PSB28 PROTEIN

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

3zpn__assembly_1__model_1

3zpn__assembly_1__model_1 | I(q)

3zpn__assembly_1__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	THERMOSYNECHOCOCCUS ELONGATUS
NCBI taxonomy ID ncbi_taxonomy_id	146786
Host organism host_organism	ESCHERICHIA COLI

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	53

Structure of Psb28

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

PHOTOSYSTEM II REACTION CENTER PSB28 PROTEIN

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

3zpn__assembly_1__model_1

3zpn__assembly_1__model_1 | I(q)

3zpn__assembly_1__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)