SAXSdb — 1phn

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

PHYCOCYANIN

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	PHYCOCYANIN × 1 （P00311） PHYCOCYANOBILIN × 2 PHYCOERYTHROBILIN × 1 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 12	PHYCOCYANIN × 6 （P00311） PHYCOCYANOBILIN × 12 PHYCOERYTHROBILIN × 6 water × 12	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 6	PHYCOCYANIN × 3 （P00311） PHYCOCYANOBILIN × 6 PHYCOERYTHROBILIN × 3 water × 6	Consistent with protein count
4	Protein heterocomplex	Heteromer	Protein 4	PHYCOCYANIN × 2 （P00311） PHYCOCYANOBILIN × 4 PHYCOERYTHROBILIN × 2 water × 4	Consistent with protein count
5	Protein heterocomplex	Heteromer	Protein 4	PHYCOCYANIN × 2 （P00311） PHYCOCYANOBILIN × 4 PHYCOERYTHROBILIN × 2 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHCA_GALSU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–162； UniProt 1–162

PHYCOCYANIN

OrganismNot specified

UniProt P00311

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	PHYCOCYANIN × 1 （P00306） PHYCOCYANOBILIN × 2 PHYCOERYTHROBILIN × 1 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 12	PHYCOCYANIN × 6 （P00306） PHYCOCYANOBILIN × 12 PHYCOERYTHROBILIN × 6 water × 12	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 6	PHYCOCYANIN × 3 （P00306） PHYCOCYANOBILIN × 6 PHYCOERYTHROBILIN × 3 water × 6	Consistent with protein count
4	Protein heterocomplex	Heteromer	Protein 4	PHYCOCYANIN × 2 （P00306） PHYCOCYANOBILIN × 4 PHYCOERYTHROBILIN × 2 water × 4	Consistent with protein count
5	Protein heterocomplex	Heteromer	Protein 4	PHYCOCYANIN × 2 （P00306） PHYCOCYANOBILIN × 4 PHYCOERYTHROBILIN × 2 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHCB_GALSU
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–172； UniProt 1–172

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	1phn
Deposition date deposition_date	1995-06-21
Structure title title	STRUCTURE OF PHYCOCYANIN FROM CYANIDIUM CALDARIUM AT 1.65A RESOLUTION
Keywords keywords	PHYCOCYANIN, PHYCOBILISOME, ELECTRON TRANSPORT; ELECTRON TRANSPORT
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.

1phn__assembly_5__model_1

Assembly 5 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1phn__assembly_5__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1phn__assembly_5__model_1 | P(r) · Pending

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

Rg（Guinier）	29.23 Å
Rg (electron density)	28.63 Å
Total Rg	29.17 Å
Atom count	5272
Residues	666
Excluded volume	93629 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1phn__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1phn__assembly_2__model_1`	dodecameric （12）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1phn__assembly_3__model_1`	hexameric （6）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`1phn__assembly_4__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`1phn__assembly_5__model_1`	tetrameric （4）	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 (5)

Entity 1 Entity 1 polymer

Description description	PHYCOCYANIN
Molecular weight formula_weight	17519.6 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3208

MKTPITEAIAAADNQGRFLSNTELQAVNGRYQRAAASLEAARSLTSNAERLINGAAQAVYSKFPYTSQMPGPQYASSAVGKAKCARDIGYYLRMVTYCLVVGGTGPMDEYLIAGLEEINRTFDLSPSWYVEALNYIKANHGLSGQAANEANTYIDYAINALS

Entity 2 Entity 2 polymer

Description description	PHYCOCYANIN
Molecular weight formula_weight	18282.7 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MLDAFAKVVAQADARGEFLSNTQLDALSKMVSEGNKRLDVVNRITSNASAIVTNAARALFSEQPQLIQPGGNAYTNRRMAACLRDMEIILRYVSYAIIAGDSSILDDRCLNGLRETYQALGVPGASVAVGIEKMKDSAIAIANDPSGITTGDCSALMAEVGTYFDRAATAVQ

Entity 3 Entity 3 non-polymer

Description description	PHYCOCYANOBILIN
Molecular weight formula_weight	588.7 kDa
Source method src_method	syn
Copy count entity_count	2

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	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	572

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1phna_
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	d1phnb_
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 (2 domains)

Domain ID domain_id	1phnA00
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	1phnB00
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	106.420 Å
Unit-cell length b length_b	106.420 Å
Unit-cell length c length_c	176.180 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 2
Space-group number int_tables_number	155
Crystal system crystal_system	—

Resolution resolution	1.650 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.1830
R_work r_work	0.1830
R_free r_free	0.2720

STRUCTURE OF PHYCOCYANIN FROM CYANIDIUM CALDARIUM AT 1.65A RESOLUTION

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

PHYCOCYANIN

State in the Current Structure

Other States of the Same Protein in the Database

PHYCOCYANIN

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

1phn__assembly_5__model_1

1phn__assembly_5__model_1 | I(q)

1phn__assembly_5__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

STRUCTURE OF PHYCOCYANIN FROM CYANIDIUM CALDARIUM AT 1.65A RESOLUTION

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

PHYCOCYANIN

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

PHYCOCYANIN

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

1phn__assembly_5__model_1

1phn__assembly_5__model_1 | I(q)

1phn__assembly_5__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)