SAXSdb — 3siq

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

Apoptosis 1 inhibitor

Drosophila melanogaster

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	ZINC ION × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	ZINC ION × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	ZINC ION × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	ZINC ION × 1	Consistent with protein count
5	Protein monomer	Monomer	Protein 1	ZINC ION × 1	Consistent with protein count
6	Protein monomer	Monomer	Protein 1	ZINC ION × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	IAP1_DROME
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–128； UniProt 1–135 Author chain B； PDBConstruct 1–128； UniProt 1–135 Author chain C； PDBConstruct 1–128； UniProt 1–135 Author chain D； PDBConstruct 1–128； UniProt 1–135 Author chain E； PDBConstruct 1–128； UniProt 1–135 Author chain F； PDBConstruct 1–128； UniProt 1–135

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	3siq
Deposition date deposition_date	2011-06-20
Structure title title	Crystal Structure of autoinhibited dIAP1-BIR1 domain
Keywords keywords	dIAP1-BIR1 domain, LIGASE; LIGASE
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.

3siq__assembly_4__model_1

Assembly 4 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3siq__assembly_4__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3siq__assembly_4__model_1 | P(r) · Pending

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

Rg（Guinier）	13.89 Å
Rg (electron density)	12.51 Å
Total Rg	13.79 Å
Atom count	797
Residues	97
Excluded volume	14067 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3siq__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3siq__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3siq__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`3siq__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`3siq__assembly_5__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`3siq__assembly_6__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 (3)

Entity 1 Entity 1 polymer

Description description	Apoptosis 1 inhibitor
Molecular weight formula_weight	15996.9 kDa
EC 编号 ec_number	6.3.2.-
Mutation mutation	C89S
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	4806

MASVVPIAFDQVDNNTNATQLFKNNINKTRMNDLNREETRLKTFTDWPLDWLDKRQLAQTGMYFTHAGDKVKCFFCGVEIGSWEQEDQPVPEHQRWSPNCPLLRRRTTNNVPINAEALDRILPPISYDLEHHHHHH

Source Source

Source organism organism	Drosophila melanogaster
Common name common_name	Fruit fly
NCBI taxonomy ID ncbi_taxonomy_id	7227
Host organism host_organism	Escherichia coli

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 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	4

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6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id	3siqA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

Domain ID domain_id	3siqB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

Domain ID domain_id	3siqC00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

Domain ID domain_id	3siqD00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

Domain ID domain_id	3siqE00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

Domain ID domain_id	3siqF00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1170 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A
Homologous superfamily homologous superfamily	10 — Inhibitor Of Apoptosis Protein (2mihbC-IAP-1); Chain A

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Unit-cell length a length_a	99.782 Å
Unit-cell length b length_b	99.782 Å
Unit-cell length c length_c	71.344 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	18

Space group space_group	P 31
Space-group number int_tables_number	144
Crystal system crystal_system	—

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	32.980 Å
R factor r_factor	0.1496
R_work r_work	0.1457
R_free r_free	0.2171

Crystal Structure of autoinhibited dIAP1-BIR1 domain

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

Apoptosis 1 inhibitor

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

3siq__assembly_4__model_1

3siq__assembly_4__model_1 | I(q)

3siq__assembly_4__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)

Crystal Structure of autoinhibited dIAP1-BIR1 domain

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

Apoptosis 1 inhibitor

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

3siq__assembly_4__model_1

3siq__assembly_4__model_1 | I(q)

3siq__assembly_4__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)