SAXSdb — 2iaz

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

Hypothetical protein SP1372

Streptococcus pneumoniae

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Y1372_STRPN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–113； UniProt 1–112 Author chain B； PDBConstruct 2–113； UniProt 1–112 Author chain C； PDBConstruct 2–113； UniProt 1–112 Author chain D； PDBConstruct 2–113； UniProt 1–112

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	2iaz
Deposition date deposition_date	2006-09-08
Structure title title	Crystal structure of a Conserved Protein of Unknown Function SP1372 from Streptococcus pneumoniae
Keywords keywords	;Structural genomics, Streptococcus pneumoniae, PSI-2, Protein Structure Initiative, Midwest Center for Structural Genomics, MCSG, UNKNOWN FUNCTION ;; STRUCTURAL GENOMICS, UNKNOWN FUNCTION
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.

2iaz__assembly_1__model_1

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

Download this curve (.dat)

2iaz__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2iaz__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.55 Å
Rg (electron density)	25.45 Å
Total Rg	26.25 Å
Atom count	3438
Residues	430
Excluded volume	61695 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2iaz__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 (2)

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6. Fold Classification (SCOP + CATH) 11 domains

SCOP 2.08 (7 domains)

Domain ID domain_id	d2iaza1
Class class	a — All alpha proteins
Fold Fold fold	a.281 — YheA-like
Superfamily Superfamily superfamily	a.281.1 — YheA/YmcA-like
Family Family family	a.281.1.2 — YheA-like

Domain ID domain_id	d2iaza2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d2iazb2
Class class	a — All alpha proteins
Fold Fold fold	a.281 — YheA-like
Superfamily Superfamily superfamily	a.281.1 — YheA/YmcA-like
Family Family family	a.281.1.2 — YheA-like

Domain ID domain_id	d2iazb3
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d2iazc_
Class class	a — All alpha proteins
Fold Fold fold	a.281 — YheA-like
Superfamily Superfamily superfamily	a.281.1 — YheA/YmcA-like
Family Family family	a.281.1.2 — YheA-like

Domain ID domain_id	d2iazd2
Class class	a — All alpha proteins
Fold Fold fold	a.281 — YheA-like
Superfamily Superfamily superfamily	a.281.1 — YheA/YmcA-like
Family Family family	a.281.1.2 — YheA-like

Domain ID domain_id	d2iazd3
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (4 domains)

Domain ID domain_id	2iazA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1500 — YheA-like fold
Homologous superfamily homologous superfamily	10 — YheA/YmcA-like

Domain ID domain_id	2iazB00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1500 — YheA-like fold
Homologous superfamily homologous superfamily	10 — YheA/YmcA-like

Domain ID domain_id	2iazC00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1500 — YheA-like fold
Homologous superfamily homologous superfamily	10 — YheA/YmcA-like

Domain ID domain_id	2iazD00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1500 — YheA-like fold
Homologous superfamily homologous superfamily	10 — YheA/YmcA-like

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Unit-cell length a length_a	64.808 Å
Unit-cell length b length_b	86.715 Å
Unit-cell length c length_c	93.881 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	16

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

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	33.630 Å
R factor r_factor	0.2319
R_work r_work	0.2287
R_free r_free	0.2890

Description description	Hypothetical protein SP1372
Molecular weight formula_weight	12666.8 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	3543

Crystal structure of a Conserved Protein of Unknown Function SP1372 from Streptococcus pneumoniae

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

Hypothetical protein SP1372

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

2iaz__assembly_1__model_1

2iaz__assembly_1__model_1 | I(q)

2iaz__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 11 domains

SCOP 2.08 (7 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Streptococcus pneumoniae
NCBI taxonomy ID ncbi_taxonomy_id	170187
Host organism host_organism	Escherichia coli BL21

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	105

Crystal structure of a Conserved Protein of Unknown Function SP1372 from Streptococcus pneumoniae

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

Hypothetical protein SP1372

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

2iaz__assembly_1__model_1

2iaz__assembly_1__model_1 | I(q)

2iaz__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 11 domains

SCOP 2.08 (7 domains)

CATH v4.4 (4 domains)

7. Citations (1)