SAXSdb — 2iwl

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

PHOSPHATIDYLINOSITOL-4-PHOSPHATE 3-KINASE C2 DOMAIN-CONTAINING ALPHA POLYPEPTIDE

HOMO SAPIENS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	SULFATE ION × 12 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	P3C2A_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain X； PDBConstruct 1–140； UniProt 1405–1544

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	2iwl
Deposition date deposition_date	2006-07-01
Structure title title	Structure of the PX Domain of Phosphoinositide 3-Kinase-C2alpha
Keywords keywords	PI3K, KINASE, PX DOMAIN, TRANSFERASE, PHOSPHOINOSITIDE 3-KINASE, PHOSPHORYLATION, NUCLEAR PROTEIN, PHOSPHOINOSITIDE; TRANSFERASE
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.

2iwl__assembly_1__model_1

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

Download this curve (.dat)

2iwl__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2iwl__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.65 Å
Rg (electron density)	25.46 Å
Total Rg	26.43 Å
Atom count	4124
Residues	484
Excluded volume	73616 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2iwl__assembly_1__model_1`	tetrameric （4）	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 (3)

Entity 1 Entity 1 polymer

Description description	PHOSPHATIDYLINOSITOL-4-PHOSPHATE 3-KINASE C2 DOMAIN-CONTAINING ALPHA POLYPEPTIDE
Molecular weight formula_weight	16466.0 kDa
EC 编号 ec_number	2.7.1.154, 2.7.1.137
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	X
Atom count atom_count	1069

DEPILSFSPKTYSFRQDGRIKEVSVFTYHKKYNPDKHYIYVVRILREGQIEPSFVFRTFDEFQELHNKLSIIFPLWKLPGFPNRMVLGRTHIKDVAAKRKIELNSYLQSLMNASTDVAECDLVCTFFHPLLRDEKAEGIA

Source Source

Source organism organism	HOMO SAPIENS
Common name common_name	HUMAN
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	ESCHERICHIA COLI BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	9

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d2iwlx_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.189 — PX domain
Superfamily Superfamily superfamily	d.189.1 — PX domain
Family Family family	d.189.1.0 — automated matches

CATH v4.4 (1 domains)

Domain ID domain_id	2iwlX00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1520 — PX Domain
Homologous superfamily homologous superfamily	10 — Phox-like domain

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Unit-cell length a length_a	115.933 Å
Unit-cell length b length_b	115.933 Å
Unit-cell length c length_c	115.933 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	24

Space group space_group	P 4 3 2
Space-group number int_tables_number	207
Crystal system crystal_system	—

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	67.000 Å
R factor r_factor	0.2520
R_work r_work	0.2470
R_free r_free	0.2900

Structure of the PX Domain of Phosphoinositide 3-Kinase-C2alpha

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

PHOSPHATIDYLINOSITOL-4-PHOSPHATE 3-KINASE C2 DOMAIN-CONTAINING ALPHA POLYPEPTIDE

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

2iwl__assembly_1__model_1

2iwl__assembly_1__model_1 | I(q)

2iwl__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)

Structure of the PX Domain of Phosphoinositide 3-Kinase-C2alpha

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

PHOSPHATIDYLINOSITOL-4-PHOSPHATE 3-KINASE C2 DOMAIN-CONTAINING ALPHA POLYPEPTIDE

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

2iwl__assembly_1__model_1

2iwl__assembly_1__model_1 | I(q)

2iwl__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)