4cp9

Crystal structure OF lecA lectin complexed with a divalent galactoside at 1.65 angstrom

Method: X-RAY DIFFRACTION

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

PA-I GALACTOPHILIC LECTIN

PSEUDOMONAS AERUGINOSA

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	CALCIUM ION × 4 beta-D-galactopyranose × 4 (4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide × 4 PENTAETHYLENE GLYCOL × 4 SULFATE ION × 2 1,2-ETHANEDIOL × 2 water × 4	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	CALCIUM ION × 1 beta-D-galactopyranose × 1 (4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide × 1 PENTAETHYLENE GLYCOL × 1 SULFATE ION × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	CALCIUM ION × 1 beta-D-galactopyranose × 1 (4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide × 1 PENTAETHYLENE GLYCOL × 1 1,2-ETHANEDIOL × 2 water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	CALCIUM ION × 1 beta-D-galactopyranose × 1 (4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide × 1 PENTAETHYLENE GLYCOL × 1 water × 1	Consistent with protein count
5	Protein monomer	Monomer	Protein 1	CALCIUM ION × 1 beta-D-galactopyranose × 1 (4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide × 1 PENTAETHYLENE GLYCOL × 1 SULFATE ION × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PA1L_PSEAE
Isoform	—
PDB entities	1, 2
Chains and sequence ranges	Author chain A； PDBConstruct 1–121； UniProt 2–122 Author chain B； PDBConstruct 1–121； UniProt 2–122 Author chain C； PDBConstruct 1–121； UniProt 2–122 Author chain D； PDBConstruct 1–121； UniProt 2–122

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	4cp9
Deposition date deposition_date	2014-02-04
Structure title title	Crystal structure OF lecA lectin complexed with a divalent galactoside at 1.65 angstrom
Keywords keywords	SUGAR BINDING PROTEIN, GALACTOSE BINDING, SUGAR BASED INHIBITOR; SUGAR 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.

4cp9__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4cp9__assembly_3__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4cp9__assembly_3__model_1 | P(r) · Pending

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

Rg（Guinier）	15.37 Å
Rg (electron density)	14.15 Å
Total Rg	15.23 Å
Atom count	956
Residues	120
Excluded volume	16875 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4cp9__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4cp9__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`4cp9__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`4cp9__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`4cp9__assembly_5__model_1`	monomeric （1）	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 (9)

Entity 1 Entity 1 polymer

Description description	PA-I GALACTOPHILIC LECTIN
Molecular weight formula_weight	12834.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	4294

AWKGEVLANNEAGQVTSIIYNPGDVITIVAAGWASYGPTQKWGPQGDREHPDQGLICHDAFCGALVMKIGNSGTIPVNTGLFRWVAPNNVQGAITLIYNDVPGTYGNNSGSFSVNIGKDQS

Source Source

Source organism organism	PSEUDOMONAS AERUGINOSA
NCBI taxonomy ID ncbi_taxonomy_id	208964
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 polymer

Description description	PA-I GALACTOPHILIC LECTIN
Molecular weight formula_weight	12818.1 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

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

AWKGEVLANNEAGQVTSIIYNPGDVITIVAAGWASYGPTQKWGPQGDREHPDQGLICHDAFCGALVMKIGNSGTIPVNTGLFRWVAPNNVQGAITLIYNDVPGTYGNNSGSFSVNIGKDQS

Source Source

Source organism organism	PSEUDOMONAS AERUGINOSA
NCBI taxonomy ID ncbi_taxonomy_id	208964
Host organism host_organism	ESCHERICHIA COLI

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	beta-D-galactopyranose
Molecular weight formula_weight	180.2 kDa
Source method src_method	man
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	(4S)-N-ethyl-4-{[N-methyl-3-(1-{2-[(4-sulfanylbenzoyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)-L-alanyl]amino}-L-prolinamide
Molecular weight formula_weight	488.6 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 6 Entity 6 non-polymer

Description description	PENTAETHYLENE GLYCOL
Molecular weight formula_weight	238.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 7 Entity 7 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 8 Entity 8 non-polymer

Description description	1,2-ETHANEDIOL
Molecular weight formula_weight	62.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 9 Entity 9 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	418

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d4cp9a_
Class class	b — All beta proteins
Fold Fold fold	b.18 — Galactose-binding domain-like
Superfamily Superfamily superfamily	b.18.1 — Galactose-binding domain-like
Family Family family	b.18.1.16 — PA-IL, galactose-binding lectin 1

Domain ID domain_id	d4cp9b_
Class class	b — All beta proteins
Fold Fold fold	b.18 — Galactose-binding domain-like
Superfamily Superfamily superfamily	b.18.1 — Galactose-binding domain-like
Family Family family	b.18.1.16 — PA-IL, galactose-binding lectin 1

Domain ID domain_id	d4cp9c_
Class class	b — All beta proteins
Fold Fold fold	b.18 — Galactose-binding domain-like
Superfamily Superfamily superfamily	b.18.1 — Galactose-binding domain-like
Family Family family	b.18.1.16 — PA-IL, galactose-binding lectin 1

Domain ID domain_id	d4cp9d_
Class class	b — All beta proteins
Fold Fold fold	b.18 — Galactose-binding domain-like
Superfamily Superfamily superfamily	b.18.1 — Galactose-binding domain-like
Family Family family	b.18.1.16 — PA-IL, galactose-binding lectin 1

CATH v4.4 (4 domains)

Domain ID domain_id	4cp9A00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	430 — Galactose-binding lectin

Domain ID domain_id	4cp9B00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	430 — Galactose-binding lectin

Domain ID domain_id	4cp9C00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	430 — Galactose-binding lectin

Domain ID domain_id	4cp9D00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	430 — Galactose-binding lectin

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Unit-cell length a length_a	50.876 Å
Unit-cell length b length_b	66.259 Å
Unit-cell length c length_c	159.427 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	12

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.650 Å
Low-resolution limit resolution_low	48.470 Å
R factor r_factor	0.1567
R_work r_work	0.1552
R_free r_free	0.1836

Crystal structure OF lecA lectin complexed with a divalent galactoside at 1.65 angstrom

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

PA-I GALACTOPHILIC LECTIN

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

4cp9__assembly_3__model_1

4cp9__assembly_3__model_1 | I(q)

4cp9__assembly_3__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 (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

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 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Crystal structure OF lecA lectin complexed with a divalent galactoside at 1.65 angstrom

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

PA-I GALACTOPHILIC LECTIN

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

4cp9__assembly_3__model_1

4cp9__assembly_3__model_1 | I(q)

4cp9__assembly_3__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 (9)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

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 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)