SAXSdb — 1b8d

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

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (ALPHA CHAIN))

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 15	PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (BETA CHAIN)) × 6 （O36004） PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (GAMMA CHAIN)) × 3 PHYCOERYTHROBILIN × 24 PHYCOUROBILIN × 6 water × 12	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHEA_GRIMO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–164； UniProt 1–164 Author chain K； PDBConstruct 1–164； UniProt 1–164

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (BETA CHAIN))

OrganismNot specified

UniProt O36004

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 15	PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (ALPHA CHAIN)) × 6 （O36005） PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (GAMMA CHAIN)) × 3 PHYCOERYTHROBILIN × 24 PHYCOUROBILIN × 6 water × 12	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHEB_GRIMO
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–177； UniProt 1–177 Author chain L； PDBConstruct 1–177； UniProt 1–177

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	1b8d
Deposition date deposition_date	1999-01-29
Structure title title	CRYSTAL STRUCTURE OF A PHYCOUROBILIN-CONTAINING PHYCOERYTHRIN
Keywords keywords	LIGHT-HARVESTING COMPLEX, RED ALGAE, PHYCOBILIPROTEIN, 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.

1b8d__assembly_1__model_1

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

Download this curve (.dat)

1b8d__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1b8d__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	41.64 Å
Rg (electron density)	40.97 Å
Total Rg	41.34 Å
Atom count	20205
Residues	2055
Excluded volume	294650 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1b8d__assembly_1__model_1`	pentadecameric （15）	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 (6)

Entity 1 Entity 1 polymer

Description description	PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (ALPHA CHAIN))
Molecular weight formula_weight	17687.8 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,K
Atom count atom_count	7734

MKSVITTTISAADAAGRFPSSSDLESIQGNIQRAAARLEAAQKLSGNHEAVVKEAGDACFAKYSYLKNAGEAGDSPEKINKCYRDIDHYMRLINYSLVVGGTGPVDEWGIAGSREVYRALNLPGSAYIAAFTFTRDRLCVPRDMSSQAGVEFTSALDYVINSLC

Entity 2 Entity 2 polymer

Description description	PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (BETA CHAIN))
Molecular weight formula_weight	18511.9 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,L

MLDAFSRVVVTSDAKAAYVGGSDLQSLKSFINDGNKRLDAVNYIVSNASCIVSDAVSGMICENPGLIAPGGNCYTNRRMAACLRDGEIILRYVSYALLAGDSSVLDDRCLNGLKETYIALGVPTASSSRAVSIMKATATAFITNTASGRKVEVAAGDCQALQAEAASYFDKVGSSID

Entity 3 Entity 3 polymer

Description description	PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (GAMMA CHAIN))
Molecular weight formula_weight	656.7 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	G

GYXXYX

Entity 4 Entity 4 non-polymer

Description description	PHYCOERYTHROBILIN
Molecular weight formula_weight	588.7 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 5 Entity 5 non-polymer

Description description	PHYCOUROBILIN
Molecular weight formula_weight	590.7 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	333

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1b8da_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.3 — Phycocyanin-like phycobilisome proteins

Domain ID domain_id	d1b8db_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.3 — Phycocyanin-like phycobilisome proteins

Domain ID domain_id	d1b8dk_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.3 — Phycocyanin-like phycobilisome proteins

Domain ID domain_id	d1b8dl_
Class class	a — All alpha proteins
Fold Fold fold	a.1 — Globin-like
Superfamily Superfamily superfamily	a.1.1 — Globin-like
Family Family family	a.1.1.3 — Phycocyanin-like phycobilisome proteins

CATH v4.4 (4 domains)

Domain ID domain_id	1b8dA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	20 — Phycocyanins

Domain ID domain_id	1b8dB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	20 — Phycocyanins

Domain ID domain_id	1b8dK00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	20 — Phycocyanins

Domain ID domain_id	1b8dL00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	490 — Globin-like
Homologous superfamily homologous superfamily	20 — Phycocyanins

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Unit-cell length a length_a	187.350 Å
Unit-cell length b length_b	187.350 Å
Unit-cell length c length_c	59.310 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	18

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

Resolution resolution	1.900 Å
Low-resolution limit resolution_low	100.000 Å
R factor r_factor	—
R_work r_work	0.1750
R_free r_free	0.2270

CRYSTAL STRUCTURE OF A PHYCOUROBILIN-CONTAINING PHYCOERYTHRIN

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

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (ALPHA CHAIN))

State in the Current Structure

Other States of the Same Protein in the Database

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (BETA 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

1b8d__assembly_1__model_1

1b8d__assembly_1__model_1 | I(q)

1b8d__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 (6)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF A PHYCOUROBILIN-CONTAINING PHYCOERYTHRIN

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

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (ALPHA 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

PROTEIN (RHODOPHYTAN PHYCOERYTHRIN (BETA 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

1b8d__assembly_1__model_1

1b8d__assembly_1__model_1 | I(q)

1b8d__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 (6)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)