SAXSdb — 4z8k

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

C-phycocyanin 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 6	C-phycocyanin beta chain × 3 （P50033） PHYCOCYANOBILIN × 9 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

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

C-phycocyanin beta chain

OrganismNot specified

UniProt P50033

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 6	C-phycocyanin alpha chain × 3 （P50032） PHYCOCYANOBILIN × 9 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PHCB_THEEB
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	4z8k
Deposition date deposition_date	2015-04-09
Structure title title	Phycocyanin structure from T. elongatus at 2.5-A from XFEL using a viscous delivery medium for serial femtosecond crystallography
Keywords keywords	Phycocyanin, T.elongatus, Phycobiliprotein, SFX, XFEL, Agarose, Viscous delivery medium., 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.

4z8k__assembly_1__model_1

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

Download this curve (.dat)

4z8k__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4z8k__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	39.13 Å
Rg (electron density)	38.56 Å
Total Rg	38.91 Å
Atom count	15669
Residues	999
Excluded volume	140330 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4z8k__assembly_1__model_1`	hexameric （6）	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	C-phycocyanin alpha chain
Molecular weight formula_weight	17470.7 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	5321

MKTPITEAIAAADTQGRFLSNTELQAVDGRFKRAVASMEAARALTNNAQSLIDGAAQAVYQKFPYTTTMQGSQYASTPEGKAKCARDIGYYLRMITYCLVAGGTGPMDEYLIAGLSEINSTFDLSPSWYIEALKYIKANHGLTGQAAVEANAYIDYAINALS

Entity 2 Entity 2 polymer

Description description	C-phycocyanin beta chain
Molecular weight formula_weight	18216.7 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MLDAFAKVVAQADARGEFLTNAQFDALSNLVKEGNKRLDAVNRITSNASTIVANAARALFAEQPQLIQPGGNAYTNRRMAACLRDMEIILRYVTYAILAGDSSVLDDRCLNGLRETYQALGTPGSSVAVAIQKMKDAAIAIANDPNGITPGDCSALMSEIAGYFDRAAAAVA

Entity 3 Entity 3 non-polymer

Description description	PHYCOCYANOBILIN
Molecular weight formula_weight	588.7 kDa
Source method src_method	nat
Copy count entity_count	3

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	98

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d4z8ka_
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	d4z8kb_
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	4z8kA00
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	4z8kB00
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	153.400 Å
Unit-cell length b length_b	153.400 Å
Unit-cell length c length_c	39.640 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 63
Space-group number int_tables_number	173
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	29.500 Å
R factor r_factor	0.1905
R_work r_work	0.1871
R_free r_free	0.2545

Phycocyanin structure from T. elongatus at 2.5-A from XFEL using a viscous delivery medium for serial femtosecond crystallography

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

C-phycocyanin alpha chain

State in the Current Structure

Other States of the Same Protein in the Database

C-phycocyanin 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

4z8k__assembly_1__model_1

4z8k__assembly_1__model_1 | I(q)

4z8k__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Phycocyanin structure from T. elongatus at 2.5-A from XFEL using a viscous delivery medium for serial femtosecond crystallography

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

C-phycocyanin 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

C-phycocyanin 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

4z8k__assembly_1__model_1

4z8k__assembly_1__model_1 | I(q)

4z8k__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)