2x20

Structure of Peridinin-Chlorophyll-Protein reconstituted with Chl-b

Method: X-RAY DIFFRACTION

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

PERIDININ-CHLOROPHYLL A-BINDING PROTEIN, CHLOROPLASTIC

AMPHIDINIUM CARTERAE

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	CHLOROPHYLL B × 2 PERIDININ × 8 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 2 CADMIUM ION × 12 CHLORIDE ION × 6 POTASSIUM ION × 2 SODIUM ION × 2 DI(HYDROXYETHYL)ETHER × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PCP1_AMPCA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain M； PDBConstruct 1–151； UniProt 57–207

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	2x20
Deposition date deposition_date	2010-01-09
Structure title title	Structure of Peridinin-Chlorophyll-Protein reconstituted with Chl-b
Keywords keywords	LIGHT-HARVESTING POLYPEPTIDE, LIGHT HARVESTING PROTEIN, ALPHA HELICAL, PHOTOSYNTHESIS, CHROMOPHORE, CHLOROPLAST, CAROTENOIDS; 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.

2x20__assembly_1__model_1

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

Download this curve (.dat)

2x20__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2x20__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.40 Å
Rg (electron density)	20.34 Å
Total Rg	22.01 Å
Atom count	2908
Residues	302
Excluded volume	54679 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2x20__assembly_1__model_1`	dimeric （2）	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 (10)

Entity 1 Entity 1 polymer

Description description	PERIDININ-CHLOROPHYLL A-BINDING PROTEIN, CHLOROPLASTIC
Molecular weight formula_weight	15954.2 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M
Atom count atom_count	1689

ADEIGDAAKKLGDASYAFAKEVDWNNGIFLQAPGKLQPLEALKAIDKMIVMGAAADPKLLKAAAEAHHKAIGSVSGPNGVTSRADWDSVNAALGRVIASVPENMVMDVYDSVSKITDPKVPAYMKSLVNGADAEKAYEGFLAFKDVVKKSQ

Source Source

Source organism organism	AMPHIDINIUM CARTERAE
NCBI taxonomy ID ncbi_taxonomy_id	2961
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 non-polymer

Description description	CHLOROPHYLL B
Molecular weight formula_weight	907.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	PERIDININ
Molecular weight formula_weight	630.8 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	DIGALACTOSYL DIACYL GLYCEROL (DGDG)
Molecular weight formula_weight	949.3 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 non-polymer

Description description	CADMIUM ION
Molecular weight formula_weight	112.4 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 6 Entity 6 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 7 Entity 7 non-polymer

Description description	POTASSIUM ION
Molecular weight formula_weight	39.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 8 Entity 8 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 9 Entity 9 non-polymer

Description description	DI(HYDROXYETHYL)ETHER
Molecular weight formula_weight	106.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 10 Entity 10 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	196

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6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

Domain ID domain_id	2x20M00
Class class	1 — Mainly Alpha
Architecture architecture	40 — Alpha solenoid
Topology topology	10 — Peridinin-chlorophyll Protein, Chain M
Homologous superfamily homologous superfamily	10 — Peridinin-chlorophyll A binding

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Unit-cell length a length_a	68.570 Å
Unit-cell length b length_b	82.000 Å
Unit-cell length c length_c	75.410 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	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	1.950 Å
Low-resolution limit resolution_low	43.150 Å
R factor r_factor	0.1570
R_work r_work	0.1550
R_free r_free	0.1960

Structure of Peridinin-Chlorophyll-Protein reconstituted with Chl-b

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

PERIDININ-CHLOROPHYLL A-BINDING PROTEIN, CHLOROPLASTIC

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

2x20__assembly_1__model_1

2x20__assembly_1__model_1 | I(q)

2x20__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 (10)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

Entity 10 Entity 10 water

6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

7. Citations (1)

Structure of Peridinin-Chlorophyll-Protein reconstituted with Chl-b

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

PERIDININ-CHLOROPHYLL A-BINDING PROTEIN, CHLOROPLASTIC

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

2x20__assembly_1__model_1

2x20__assembly_1__model_1 | I(q)

2x20__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 (10)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

Entity 10 Entity 10 water

6. Fold Classification (SCOP + CATH) 1 domains

CATH v4.4 (1 domains)

7. Citations (1)