SAXSdb — 1k2f

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

siah-1A protein

Mus musculus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 6 BETA-MERCAPTOETHANOL × 4 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 6 BETA-MERCAPTOETHANOL × 4 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SIA1A_MOUSE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–190； UniProt 93–282 Author chain B； PDBConstruct 1–190； UniProt 93–282

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	1k2f
Deposition date deposition_date	2001-09-26
Structure title title	siah, Seven In Absentia Homolog
Keywords keywords	beta-sandwich, LIGASE, PROTEIN BINDING; LIGASE, PROTEIN BINDING
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.

1k2f__assembly_2__model_1

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

Download this curve (.dat)

1k2f__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1k2f__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	25.97 Å
Rg (electron density)	25.51 Å
Total Rg	26.06 Å
Atom count	3018
Residues	380
Excluded volume	53753 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1k2f__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1k2f__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Description description	siah-1A protein
Molecular weight formula_weight	21423.5 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3083

SVLFPCKYASSGCEITLPHTEKAEHEELCEFRPYSCPCPGASCKWQGSLDAVMPHLMHQHKSITTLQGEDIVFLATDINLPGAVDWVMMQSCFGFHFMLVLEKQEKYDGHQQFFAIVQLIGTRKQAENFAYRLELNGHRRRLTWEATPRSIHEGIATAIMNSDCLVFDTSIAQLFAENGNLGINVTISMC

Source Source

Source organism organism	Mus musculus
Common name common_name	house mouse
NCBI taxonomy ID ncbi_taxonomy_id	10090
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 3 Entity 3 non-polymer

Description description	BETA-MERCAPTOETHANOL
Molecular weight formula_weight	78.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	65

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1k2fa_
Class class	b — All beta proteins
Fold Fold fold	b.8 — TRAF domain-like
Superfamily Superfamily superfamily	b.8.1 — TRAF domain-like
Family Family family	b.8.1.2 — SIAH, seven in absentia homolog

Domain ID domain_id	d1k2fb_
Class class	b — All beta proteins
Fold Fold fold	b.8 — TRAF domain-like
Superfamily Superfamily superfamily	b.8.1 — TRAF domain-like
Family Family family	b.8.1.2 — SIAH, seven in absentia homolog

CATH v4.4 (4 domains)

Domain ID domain_id	1k2fA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	210 — Apoptosis, Tumor Necrosis Factor Receptor Associated Protein 2; Chain A
Homologous superfamily homologous superfamily	10 — Apoptosis, Tumor Necrosis Factor Receptor Associated Protein 2; Chain A

Domain ID domain_id	1k2fA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	40 — Herpes Virus-1
Homologous superfamily homologous superfamily	10 — Zinc/RING finger domain, C3HC4 (zinc finger)

Domain ID domain_id	1k2fB01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	210 — Apoptosis, Tumor Necrosis Factor Receptor Associated Protein 2; Chain A
Homologous superfamily homologous superfamily	10 — Apoptosis, Tumor Necrosis Factor Receptor Associated Protein 2; Chain A

Domain ID domain_id	1k2fB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	40 — Herpes Virus-1
Homologous superfamily homologous superfamily	10 — Zinc/RING finger domain, C3HC4 (zinc finger)

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Unit-cell length a length_a	66.474 Å
Unit-cell length b length_b	73.966 Å
Unit-cell length c length_c	80.554 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	8

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

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2265
R_work r_work	0.2199
R_free r_free	0.2770

siah, Seven In Absentia Homolog

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

siah-1A 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

1k2f__assembly_2__model_1

1k2f__assembly_2__model_1 | I(q)

1k2f__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (2)

siah, Seven In Absentia Homolog

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

siah-1A 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

1k2f__assembly_2__model_1

1k2f__assembly_2__model_1 | I(q)

1k2f__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (2)