SAXSdb — 3por

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

PORIN

Rhodobacter capsulatus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 3 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL × 3 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PORI_RHOCA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–301； UniProt 1–301

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	3por
Deposition date deposition_date	1992-11-09
Structure title title	PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION
Keywords keywords	INTEGRAL MEMBRANE PROTEIN PORIN; INTEGRAL MEMBRANE PROTEIN PORIN
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.

3por__assembly_1__model_1

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

Download this curve (.dat)

3por__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3por__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	31.87 Å
Rg (electron density)	31.43 Å
Total Rg	32.06 Å
Atom count	6744
Residues	903
Excluded volume	118670 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3por__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 (4)

Entity 1 Entity 1 polymer

Description description	PORIN
Molecular weight formula_weight	31555.4 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	2325

EVKLSGDARMGVMYNGDDWNFSSRSRVLFTMSGTTDSGLEFGASFKAHESVGAETGEDGTVFLSGAFGKIEMGDALGASEALFGDLYEVGYTDLDDRGGNDIPYLTGDERLTAEDNPVLLYTYSAGAFSVAASMSDGKVGETSEDDAQEMAVAAAYTFGNYTVGLGYEKIDSPDTALMADMEQLELAAIAKFGATNVKAYYADGELDRDFARAVFDLTPVAAAATAVDHKAYGLSVDSTFGATTVGGYVQVLDIDTIDDVTYYGLGASYDLGGGASIVGGIADNDLPNSDMVADLGVKFKF

Source Source

Source organism organism	Rhodobacter capsulatus
NCBI taxonomy ID ncbi_taxonomy_id	1061

Entity 2 Entity 2 non-polymer

Description description	(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
Molecular weight formula_weight	306.4 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
Molecular weight formula_weight	122.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	77

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d3pora_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamily	f.4.3 — Porins
Family Family family	f.4.3.1 — Porin

CATH v4.4 (1 domains)

Domain ID domain_id	3porA00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	160 — Porin
Homologous superfamily homologous superfamily	10 — Porin

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7. Citations (9)

Porin conformation in the absence of calcium. Refined structure at 2.5 A resolution.

J.Mol.Biol. (1993)

PMID: 7685826 · DOI: 10.1006/jmbi.1993.1328 PRIMARY

Structure of Porin Refined at 1.8 Angstroms Resolution

J.Mol.Biol. (1992)

Molecular Architecture and Electrostatic Properties of a Bacterial Porin

Science (1991)

Primary Structure of Porin from Rhodobacter Capsulatus

Eur.J.Biochem. (1991)

The Structure of Porin from Rhodobacter Capsulatus at 1.8 Angstroms Resolution

FEBS Lett. (1991)

Crystals of an Integral Membrane Protein Diffracting to 1.8 Angstroms Resolution

J.Mol.Biol. (1991)

The Three-Dimensional Structure of Porin from Rhodobacter Capsulatus at 3 Angstroms Resolution

FEBS Lett. (1990)

The Structure of Porin from Rhodobacter Capsulatus at 0.6 Nm Resolution

FEBS Lett. (1989)

Crystallization and Preliminary X-Ray Analysis of Porin from Rhodobacter Capsulatus

FEBS Lett. (1989)

Unit-cell length a length_a	95.300 Å
Unit-cell length b length_b	95.300 Å
Unit-cell length c length_c	146.800 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	9

Space group space_group	H 3
Space-group number int_tables_number	146
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	—
R_work r_work	0.1880
R_free r_free	—

PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION

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

PORIN

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

3por__assembly_1__model_1

3por__assembly_1__model_1 | I(q)

3por__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (9)

PORIN CONFORMATION IN THE ABSENCE OF CALCIUM; REFINED STRUCTURE AT 2.5 ANGSTROMS RESOLUTION

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

PORIN

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

3por__assembly_1__model_1

3por__assembly_1__model_1 | I(q)

3por__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (9)