SAXSdb — 1xu8

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

Maspin

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	SULFATE ION × 2 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MASP_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 6–380； UniProt 1–375 Author chain B； PDBConstruct 6–380； UniProt 1–375

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	1xu8
Deposition date deposition_date	2004-10-25
Structure title title	The 2.8 A structure of a tumour suppressing serpin
Keywords keywords	maspin, serpin, tumor suppressor, SERPINB5, SIGNALING PROTEIN; SIGNALING PROTEIN
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.

1xu8__assembly_1__model_1

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

Download this curve (.dat)

1xu8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xu8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.47 Å
Rg (electron density)	21.08 Å
Total Rg	22.05 Å
Atom count	2890
Residues	365
Excluded volume	51778 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xu8__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1xu8__assembly_2__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	Maspin
Molecular weight formula_weight	42693.8 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	5948

MGQNSMDALQLANSAFAVDLFKQLCEKEPLGNVLFSPICLSTSLSLAQVGAKGDTANEIGQVLHFENVKDVPFGFQTVTSDVNKLSSFYSLKLIKRLYVDKSLNLSTEFISSTKRPYAKELETVDFKDKLEETKGQINNSIKDLTDGHFENILADNSVNDQTKILVVNAAYFVGKWMKKFPESETKECPFRLNKTDTKPVQMMNMEATFCMGNIDSINCKIIELPFQNKHLSMFILLPKDVEDESTGLEKIEKQLNSESLSQWTNPSTMANAKVKLSIPKFKVEKMIDPKACLENLGLKHIFSEDTSDFSGMSETKGVALSNVIHKVCLEITEDGGDSIEVPGARILQHKDELNADHPFIYIIRHNKTRNIIFFGKFCSP

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

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	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	123

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1xu8a1
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.1 — Serpins
Superfamily Superfamily superfamily	e.1.1 — Serpins
Family Family family	e.1.1.1 — Serpins

Domain ID domain_id	d1xu8a2
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	d1xu8b1
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.1 — Serpins
Superfamily Superfamily superfamily	e.1.1 — Serpins
Family Family family	e.1.1.1 — Serpins

Domain ID domain_id	d1xu8b2
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	1xu8A01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	497 — Antithrombin; Chain I, domain 2
Homologous superfamily homologous superfamily	10 — Antithrombin, subunit I, domain 2

Domain ID domain_id	1xu8A02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	39 — Alpha-1-antitrypsin; domain 1
Homologous superfamily homologous superfamily	10 — Alpha-1-antitrypsin, domain 1

Domain ID domain_id	1xu8B01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	497 — Antithrombin; Chain I, domain 2
Homologous superfamily homologous superfamily	10 — Antithrombin, subunit I, domain 2

Domain ID domain_id	1xu8B02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	39 — Alpha-1-antitrypsin; domain 1
Homologous superfamily homologous superfamily	10 — Alpha-1-antitrypsin, domain 1

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Unit-cell length a length_a	53.540 Å
Unit-cell length b length_b	100.480 Å
Unit-cell length c length_c	136.610 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	2.800 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2241
R_work r_work	0.2207
R_free r_free	0.2857

The 2.8 A structure of a tumour suppressing serpin

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

Maspin

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

1xu8__assembly_1__model_1

1xu8__assembly_1__model_1 | I(q)

1xu8__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

The 2.8 A structure of a tumour suppressing serpin

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

Maspin

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

1xu8__assembly_1__model_1

1xu8__assembly_1__model_1 | I(q)

1xu8__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)