SAXSdb — 1xxw

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

Phospholipase A2 isoform 1

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	Phospholipase A2 isoform 2 × 1 （P60044） ZINC ION × 1 ACETIC ACID × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PA21B_NAJSG
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–118； UniProt 8–126

Phospholipase A2 isoform 2

OrganismNot specified

UniProt P60044

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Phospholipase A2 isoform 1 × 1 （P60043） ZINC ION × 1 ACETIC ACID × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PA22_NAJSG
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–118； UniProt 8–126

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	1xxw
Deposition date deposition_date	2004-11-09
Structure title title	Structure of zinc induced heterodimer of two calcium free isoforms of phospholipase A2 from Naja naja sagittifera at 2.7A resolution
Keywords keywords	venom, esterolytic activity, zinc induced, dimer, HYDROLASE; HYDROLASE
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.

1xxw__assembly_1__model_1

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

Download this curve (.dat)

1xxw__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xxw__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.98 Å
Rg (electron density)	18.24 Å
Total Rg	19.09 Å
Atom count	1846
Residues	238
Excluded volume	31796 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xxw__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 (5)

Entity 1 Entity 1 polymer

Description description	Phospholipase A2 isoform 1
Molecular weight formula_weight	13220.7 kDa
EC 编号 ec_number	3.1.1.4
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	2040

NTYQFKNMIQCTVPKRSWWDFADYGCYCGRGGSGTPIDDLDRCCQVHDNCYNSAREQGGCRPKQKTYSYECKAGTLSCSGSNNSCAATVCDCDRLAAICFAGAPYNDNNYNIDLKARCQ

Entity 2 Entity 2 polymer

Description description	Phospholipase A2 isoform 2
Molecular weight formula_weight	13288.7 kDa
EC 编号 ec_number	3.1.1.4
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

NRWQFKNMISCTVPSRSWWDFADYGCYCGRGGSGTPVDDLDRCCQVHDNCYNEAEKISGCNPRFRTYSYECTAGTLTCTGRNNACAASVCDCDRLAAICFAGAPYNDNNYNIDLQARCN

Entity 3 Entity 3 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	ACETIC ACID
Molecular weight formula_weight	60.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	194

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1xxwa_
Class class	a — All alpha proteins
Fold Fold fold	a.133 — Phospholipase A2, PLA2
Superfamily Superfamily superfamily	a.133.1 — Phospholipase A2, PLA2
Family Family family	a.133.1.2 — Vertebrate phospholipase A2

Domain ID domain_id	d1xxwb_
Class class	a — All alpha proteins
Fold Fold fold	a.133 — Phospholipase A2, PLA2
Superfamily Superfamily superfamily	a.133.1 — Phospholipase A2, PLA2
Family Family family	a.133.1.2 — Vertebrate phospholipase A2

CATH v4.4 (2 domains)

Domain ID domain_id	1xxwA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	90 — Phospholipase A2
Homologous superfamily homologous superfamily	10 — Phospholipase A2 domain

Domain ID domain_id	1xxwB00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	90 — Phospholipase A2
Homologous superfamily homologous superfamily	10 — Phospholipase A2 domain

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Unit-cell length a length_a	65.467 Å
Unit-cell length b length_b	65.467 Å
Unit-cell length c length_c	58.427 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	4

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	19.510 Å
R factor r_factor	0.1880
R_work r_work	0.1880
R_free r_free	0.2320

Structure of zinc induced heterodimer of two calcium free isoforms of phospholipase A2 from Naja naja sagittifera at 2.7A resolution

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

Phospholipase A2 isoform 1

State in the Current Structure

Other States of the Same Protein in the Database

Phospholipase A2 isoform 2

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

1xxw__assembly_1__model_1

1xxw__assembly_1__model_1 | I(q)

1xxw__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 (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 zinc induced heterodimer of two calcium free isoforms of phospholipase A2 from Naja naja sagittifera at 2.7A resolution

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

Phospholipase A2 isoform 1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Phospholipase A2 isoform 2

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

1xxw__assembly_1__model_1

1xxw__assembly_1__model_1 | I(q)

1xxw__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 (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)