SAXSdb — 3mg2

▼

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

Orange carotenoid protein

Synechocystis sp.

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	beta,beta-caroten-4-one × 2 water × 2	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	beta,beta-caroten-4-one × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	beta,beta-caroten-4-one × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	OCP_SYNY3
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–316； UniProt 1–316 Author chain B； PDBConstruct 1–316； UniProt 1–316

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	3mg2
Deposition date deposition_date	2010-04-05
Structure title title	Crystal structure of the orange carotenoid protein Y44S mutant from cyanobacteria synechocystis sp. PCC 6803
Keywords keywords	Carotenoid binding protein, Echinone, Phycobilisome; CAROTENOID BINDING PROTEIN
Experimental Method method	X-RAY DIFFRACTION

▼

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.

3mg2__assembly_1__model_1

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

Download this curve (.dat)

3mg2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3mg2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.94 Å
Rg (electron density)	25.80 Å
Total Rg	26.69 Å
Atom count	4662
Residues	603
Excluded volume	83896 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3mg2__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3mg2__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3mg2__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	Orange carotenoid protein
Molecular weight formula_weight	35379.3 kDa
Mutation mutation	Y44S
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	4812

MPFTIDSARGIFPNTLAADVVPATIARFSQLNAEDQLALIWFASLEMGKTLTIAAPGAASMQLAENALKEIQAMGPLQQTQAMCDLANRADTPLCRTYASWSPNIKLGFWYRLGELMEQGFVAPIPAGYQLSANANAVLATIQGLESGQQITVLRNAVVDMGFTAGKDGKRIAEPVVPPQDTASRTKVSIEGVTNATVLNYMDNLNANDFDTLIELFTSDGALQPPFQRPIVGKENVLRFFREECQNLKLIPERGVTEPAEDGFTQIKVTGKVQTPWFGGNVGMNIAWRFLLNPEGKIFFVAIDLLASPKELLNFAVHHHHHH

Source Source

Source organism organism	Synechocystis sp.
NCBI taxonomy ID ncbi_taxonomy_id	1148
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	beta,beta-caroten-4-one
Molecular weight formula_weight	550.9 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	150

▼

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d3mg2a1
Class class	a — All alpha proteins
Fold Fold fold	a.175 — Orange carotenoid protein, N-terminal domain
Superfamily Superfamily superfamily	a.175.1 — Orange carotenoid protein, N-terminal domain
Family Family family	a.175.1.1 — Orange carotenoid protein, N-terminal domain

Domain ID domain_id	d3mg2a2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.4 — NTF2-like
Family Family family	d.17.4.0 — automated matches

Domain ID domain_id	d3mg2b1
Class class	a — All alpha proteins
Fold Fold fold	a.175 — Orange carotenoid protein, N-terminal domain
Superfamily Superfamily superfamily	a.175.1 — Orange carotenoid protein, N-terminal domain
Family Family family	a.175.1.1 — Orange carotenoid protein, N-terminal domain

Domain ID domain_id	d3mg2b2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.17 — Cystatin-like
Superfamily Superfamily superfamily	d.17.4 — NTF2-like
Family Family family	d.17.4.0 — automated matches

CATH v4.4 (4 domains)

Domain ID domain_id	3mg2A01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	2090 — orange carotenoid protein, domain 2
Homologous superfamily homologous superfamily	10 — Orange carotenoid-binding protein, N-terminal domain

Domain ID domain_id	3mg2A02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	3mg2B01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	2090 — orange carotenoid protein, domain 2
Homologous superfamily homologous superfamily	10 — Orange carotenoid-binding protein, N-terminal domain

Domain ID domain_id	3mg2B02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	450 — Nuclear Transport Factor 2; Chain: A,
Homologous superfamily homologous superfamily	50 —

▶

Unit-cell length a length_a	83.188 Å
Unit-cell length b length_b	83.188 Å
Unit-cell length c length_c	87.974 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	6

Space group space_group	P 32
Space-group number int_tables_number	145
Crystal system crystal_system	—

Resolution resolution	2.653 Å
Low-resolution limit resolution_low	37.542 Å
R factor r_factor	0.1974
R_work r_work	0.1941
R_free r_free	0.2596

Crystal structure of the orange carotenoid protein Y44S mutant from cyanobacteria synechocystis sp. PCC 6803

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

Orange carotenoid 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

3mg2__assembly_1__model_1

3mg2__assembly_1__model_1 | I(q)

3mg2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (2)

Crystal structure of the orange carotenoid protein Y44S mutant from cyanobacteria synechocystis sp. PCC 6803

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

Orange carotenoid 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

3mg2__assembly_1__model_1

3mg2__assembly_1__model_1 | I(q)

3mg2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (2)