SAXSdb — 3ir8

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

Large stokes shift fluorescent protein

Montipora sp. 20

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q1JV70_9CNID
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 3–221； UniProt 2–222 Author chain B； PDBConstruct 3–221； UniProt 2–222

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	3ir8
Deposition date deposition_date	2009-08-21
Structure title title	Red fluorescent protein mKeima at pH 7.0
Keywords keywords	beta barrel, FLUORESCENT PROTEIN; FLUORESCENT PROTEIN
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.

3ir8__assembly_1__model_1

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

Download this curve (.dat)

3ir8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3ir8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	17.47 Å
Rg (electron density)	16.38 Å
Total Rg	17.41 Å
Atom count	1689
Residues	213
Excluded volume	29877 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3ir8__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3ir8__assembly_2__model_1`	monomeric （1）	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

SCOP 2.08 (2 domains)

Domain ID domain_id	d3ir8a_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.22 — GFP-like
Superfamily Superfamily superfamily	d.22.1 — GFP-like
Family Family family	d.22.1.1 — Fluorescent proteins

Domain ID domain_id	d3ir8b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.22 — GFP-like
Superfamily Superfamily superfamily	d.22.1 — GFP-like
Family Family family	d.22.1.1 — Fluorescent proteins

CATH v4.4 (2 domains)

Domain ID domain_id	3ir8A00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	155 — Green Fluorescent Protein
Homologous superfamily homologous superfamily	10 — Green fluorescent protein

Domain ID domain_id	3ir8B00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	155 — Green Fluorescent Protein
Homologous superfamily homologous superfamily	10 — Green fluorescent protein

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Unit-cell length a length_a	66.959 Å
Unit-cell length b length_b	75.686 Å
Unit-cell length c length_c	85.674 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 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.630 Å
Low-resolution limit resolution_low	31.180 Å
R factor r_factor	0.1950
R_work r_work	0.1930
R_free r_free	0.2350

Description description	Large stokes shift fluorescent protein
Molecular weight formula_weight	25103.3 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3714

Red fluorescent protein mKeima at pH 7.0

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

Large stokes shift fluorescent 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

3ir8__assembly_1__model_1

3ir8__assembly_1__model_1 | I(q)

3ir8__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

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Montipora sp. 20
NCBI taxonomy ID ncbi_taxonomy_id	321802
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	306

Red fluorescent protein mKeima at pH 7.0

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

Large stokes shift fluorescent 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

3ir8__assembly_1__model_1

3ir8__assembly_1__model_1 | I(q)

3ir8__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

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)