3l2y

The structure of C-reactive protein bound to phosphoethanolamine

Method: X-RAY DIFFRACTION

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

C-reactive protein

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 5	CALCIUM ION × 10 PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5 water × 5	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 5	CALCIUM ION × 10 PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5 water × 5	Consistent with protein count
3	Protein homooligomer	Homooligomer	Protein 5	CALCIUM ION × 10 PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5 water × 5	Consistent with protein count
4	Protein homooligomer	Homooligomer	Protein 5	CALCIUM ION × 10 PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5 water × 5	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CRP_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–206； UniProt 19–224 Author chain B； PDBConstruct 1–206； UniProt 19–224 Author chain C； PDBConstruct 1–206； UniProt 19–224 Author chain D； PDBConstruct 1–206； UniProt 19–224 Author chain E； PDBConstruct 1–206； UniProt 19–224 Author chain F； PDBConstruct 1–206； UniProt 19–224 Author chain G； PDBConstruct 1–206； UniProt 19–224 Author chain H； PDBConstruct 1–206； UniProt 19–224 Author chain I； PDBConstruct 1–206； UniProt 19–224 Author chain J； PDBConstruct 1–206； UniProt 19–224 Author chain K； PDBConstruct 1–206； UniProt 19–224 Author chain L； PDBConstruct 1–206； UniProt 19–224 Author chain M； PDBConstruct 1–206； UniProt 19–224 Author chain N； PDBConstruct 1–206； UniProt 19–224 Author chain O； PDBConstruct 1–206； UniProt 19–224 Author chain P； PDBConstruct 1–206； UniProt 19–224 Author chain Q； PDBConstruct 1–206； UniProt 19–224 Author chain R； PDBConstruct 1–206； UniProt 19–224 Author chain S； PDBConstruct 1–206； UniProt 19–224 Author chain T； PDBConstruct 1–206； UniProt 19–224

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	3l2y
Deposition date deposition_date	2009-12-15
Structure title title	The structure of C-reactive protein bound to phosphoethanolamine
Keywords keywords	;PENTRAXIN, ACUTE PHASE REACTANT, IMMUNE SYSTEM, PHOSPHOETHANOLAMINE, Acute phase, Metal-binding, Pyrrolidone carboxylic acid, Secreted, Calcium-BINDING PROTEIN ;; Calcium-BINDING PROTEIN
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.

3l2y__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3l2y__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3l2y__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	36.10 Å
Rg (electron density)	35.13 Å
Total Rg	35.89 Å
Atom count	8210
Residues	1030
Excluded volume	147020 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3l2y__assembly_1__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3l2y__assembly_2__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3l2y__assembly_3__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`3l2y__assembly_4__model_1`	pentameric （5）	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-reactive protein
Molecular weight formula_weight	23068.0 kDa
Source method src_method	nat
Copy count entity_count	20

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T
Atom count atom_count	32993

QTDMSRKAFVFPKESDTSYVSLKAPLTKPLKAFTVCLHFYTELSSTRGYSIFSYATKRQDNEILIFWSKDIGYSFTVGGSEILFEVPEVTVAPVHICTSWESASGIVEFWVDGKPRVRKSLKKGYTVGAEASIILGQEQDSFGGNFEGSQSLVGDIGNVNMWDFVLSPDEINTIYLGGPFSPNVLNWRALKYEVQGEVFTKPQLWP

Entity 2 Entity 2 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	40

Entity 3 Entity 3 non-polymer

Description description	PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER
Molecular weight formula_weight	141.1 kDa
Source method src_method	syn
Copy count entity_count	20

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	153

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6. Fold Classification (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

Domain ID domain_id	d3l2ya_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yb_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yc_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yd_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2ye_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yf_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yg_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yh_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yi_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yj_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yk_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yl_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2ym_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yn_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yo_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yp_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yq_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yr_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2ys_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

Domain ID domain_id	d3l2yt_
Class class	b — All beta proteins
Fold Fold fold	b.29 — Concanavalin A-like lectins/glucanases
Superfamily Superfamily superfamily	b.29.1 — Concanavalin A-like lectins/glucanases
Family Family family	b.29.1.5 — Pentraxin (pentaxin)

CATH v4.4 (20 domains)

Domain ID domain_id	3l2yA00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yB00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yC00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yD00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yE00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yF00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yG00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yH00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yI00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yJ00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yK00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yL00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yM00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yN00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yO00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yP00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yQ00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yR00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yS00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

Domain ID domain_id	3l2yT00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	200 —

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Unit-cell length a length_a	278.448 Å
Unit-cell length b length_b	278.448 Å
Unit-cell length c length_c	92.111 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	80

Space group space_group	P 41
Space-group number int_tables_number	76
Crystal system crystal_system	—

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	124.526 Å
R factor r_factor	0.2247
R_work r_work	0.2236
R_free r_free	0.2462

The structure of C-reactive protein bound to phosphoethanolamine

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

C-reactive 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

3l2y__assembly_2__model_1

3l2y__assembly_2__model_1 | I(q)

3l2y__assembly_2__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 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

CATH v4.4 (20 domains)

7. Citations (1)

The structure of C-reactive protein bound to phosphoethanolamine

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

C-reactive 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

3l2y__assembly_2__model_1

3l2y__assembly_2__model_1 | I(q)

3l2y__assembly_2__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 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 40 domains

SCOP 2.08 (20 domains)

CATH v4.4 (20 domains)

7. Citations (1)