SAXSdb — 5ku6

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

Carbonic anhydrase 4

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	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide × 1 ZINC ION × 1 SULFATE ION × 2 GLYCEROL × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide × 1 ZINC ION × 1 SULFATE ION × 2 GLYCEROL × 2 ACETATE ION × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide × 1 ZINC ION × 1 SULFATE ION × 2 GLYCEROL × 2 ACETATE ION × 1 water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide × 1 ZINC ION × 1 SULFATE ION × 2 ACETATE ION × 1 water × 1	Consistent with protein count
5	Protein homooligomer	Homooligomer	Protein 4	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide × 4 ZINC ION × 4 SULFATE ION × 8 GLYCEROL × 5 ACETATE ION × 3 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CAH4_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–266； UniProt 19–284 Author chain B； PDBConstruct 1–266； UniProt 19–284 Author chain C； PDBConstruct 1–266； UniProt 19–284 Author chain D； PDBConstruct 1–266； UniProt 19–284

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	5ku6
Deposition date deposition_date	2016-07-12
Structure title title	Crystal structure for the complex of human carbonic anhydrase IV and methazolamide
Keywords keywords	Carbonic anhydrase, Intrinsic thermodynamics, lyase, inhibitor, lyase-lyase inhibitor complex; lyase/lyase inhibitor
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.

5ku6__assembly_5__model_1

Assembly 5 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

5ku6__assembly_5__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

5ku6__assembly_5__model_1 | P(r) · Pending

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

Rg（Guinier）	33.20 Å
Rg (electron density)	32.30 Å
Total Rg	33.01 Å
Atom count	8502
Residues	1041
Excluded volume	150780 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`5ku6__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`5ku6__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`5ku6__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`5ku6__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`5ku6__assembly_5__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 (7)

Entity 1 Entity 1 polymer

Description description	Carbonic anhydrase 4
Molecular weight formula_weight	30364.5 kDa
EC 编号 ec_number	4.2.1.1
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	9433

AESHWCYEVQAESSNYPCLVPVKWGGNCQKDRQSPINIVTTKAKVDKKLGRFFFSGYDKKQTWTVQNNGHSVMMLLENKASISGGGLPAPYQAKQLHLHWSDLPYKGSEHSLDGEHFAMEMHIVHEKEKGTSRNVKEAQDPEDEIAVLAFLVEAGTQVNEGFQPLVEALSNIPKPEMSTTMAESSLLDLLPKEEKLRHYFRYLGSLTTPTCDEKVVWTVFREPIQLHREQILAFSQKLYYDKEQTVSMKDNVRPLQQLGQRTVIKS

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Cricetulus griseus

Entity 2 Entity 2 non-polymer

Description description	N-(3-methyl-5-sulfamoyl-1,3,4-thiadiazol-2(3H)-ylidene)acetamide
Molecular weight formula_weight	236.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 5 Entity 5 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 6 Entity 6 non-polymer

Description description	ACETATE ION
Molecular weight formula_weight	59.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	915

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d5ku6a_
Class class	b — All beta proteins
Fold Fold fold	b.74 — Carbonic anhydrase
Superfamily Superfamily superfamily	b.74.1 — Carbonic anhydrase
Family Family family	b.74.1.1 — Carbonic anhydrase

Domain ID domain_id	d5ku6b_
Class class	b — All beta proteins
Fold Fold fold	b.74 — Carbonic anhydrase
Superfamily Superfamily superfamily	b.74.1 — Carbonic anhydrase
Family Family family	b.74.1.1 — Carbonic anhydrase

Domain ID domain_id	d5ku6c_
Class class	b — All beta proteins
Fold Fold fold	b.74 — Carbonic anhydrase
Superfamily Superfamily superfamily	b.74.1 — Carbonic anhydrase
Family Family family	b.74.1.1 — Carbonic anhydrase

Domain ID domain_id	d5ku6d_
Class class	b — All beta proteins
Fold Fold fold	b.74 — Carbonic anhydrase
Superfamily Superfamily superfamily	b.74.1 — Carbonic anhydrase
Family Family family	b.74.1.1 — Carbonic anhydrase

CATH v4.4 (4 domains)

Domain ID domain_id	5ku6A00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	200 — Carbonic Anhydrase II
Homologous superfamily homologous superfamily	10 — Alpha carbonic anhydrase

Domain ID domain_id	5ku6B00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	200 — Carbonic Anhydrase II
Homologous superfamily homologous superfamily	10 — Alpha carbonic anhydrase

Domain ID domain_id	5ku6C00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	200 — Carbonic Anhydrase II
Homologous superfamily homologous superfamily	10 — Alpha carbonic anhydrase

Domain ID domain_id	5ku6D00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	200 — Carbonic Anhydrase II
Homologous superfamily homologous superfamily	10 — Alpha carbonic anhydrase

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Unit-cell length a length_a	64.965 Å
Unit-cell length b length_b	123.698 Å
Unit-cell length c length_c	151.367 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	1.800 Å
Low-resolution limit resolution_low	95.780 Å
R factor r_factor	0.1857
R_work r_work	0.1842
R_free r_free	0.2158

Crystal structure for the complex of human carbonic anhydrase IV and methazolamide

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

Carbonic anhydrase 4

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

5ku6__assembly_5__model_1

5ku6__assembly_5__model_1 | I(q)

5ku6__assembly_5__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 (7)

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 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (2)

Crystal structure for the complex of human carbonic anhydrase IV and methazolamide

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

Carbonic anhydrase 4

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

5ku6__assembly_5__model_1

5ku6__assembly_5__model_1 | I(q)

5ku6__assembly_5__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 (7)

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 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (2)