SAXSdb — 2nqa

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

Calpain-8

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Leupeptin Inhibitor × 2 CALCIUM ION × 5 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CAN8_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 3–326； UniProt 23–346 Author chain B； PDBConstruct 3–326； UniProt 23–346

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	2nqa
Deposition date deposition_date	2006-10-30
Structure title title	Catalytic Domain of Human Calpain 8
Keywords keywords	;CALPAIN; CALCIUM-DEPENDENT CYTOPLASMIC CYSTEINE PROTEINASES; PAPAIN-LIKE; EF-HAND; STRUCTURAL GENOMICS; STRUCTURAL GENOMICS CONSORTIUM; SGC, HYDROLASE-HYDROLASE INHIBITOR COMPLEX ;; HYDROLASE/HYDROLASE 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.

2nqa__assembly_1__model_1

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

Download this curve (.dat)

2nqa__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2nqa__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.54 Å
Rg (electron density)	26.36 Å
Total Rg	27.12 Å
Atom count	5078
Residues	622
Excluded volume	90157 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2nqa__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 (4)

Entity 1 Entity 1 polymer

Description description	Calpain-8
Molecular weight formula_weight	36680.0 kDa
EC 编号 ec_number	3.4.22.53
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	5413

GSNALKYLGQDFKTLRQQCLDSGVLFKDPEFPACPSALGYKDLGPGSPQTQGIIWKRPTELCPSPQFIVGGATRTDICQGGLGDCWLLAAIASLTLNEELLYRVVPRDQDFQENYAGIFHFQFWQYGEWVEVVIDDRLPTKNGQLLFLHSEQGNEFWSALLEKAYAKLNGCYEALAGGSTVEGFEDFTGGISEFYDLKKPPANLYQIIRKALCAGSLLGCSIDVYSAAEAEAITSQKLVKSHAYSVTGVEEVNFQGHPEKLIRLRNPWGEVEWSGAWSDDAPEWNHIDPRRKEELDKKVEDGEFWMSLSDFVRQFSRLEICNLSPD

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(DE3)

Entity 2 Entity 2 polymer

Description description	Leupeptin Inhibitor
Molecular weight formula_weight	429.6 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,E

XLLR

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	308

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6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

Domain ID domain_id	2nqaA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	70 — Cathepsin B; Chain A
Homologous superfamily homologous superfamily	10 — Cysteine proteinases

Domain ID domain_id	2nqaB02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	70 — Cathepsin B; Chain A
Homologous superfamily homologous superfamily	10 — Cysteine proteinases

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Unit-cell length a length_a	91.794 Å
Unit-cell length b length_b	91.794 Å
Unit-cell length c length_c	194.592 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	12

Space group space_group	P 61
Space-group number int_tables_number	169
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	38.954 Å
R factor r_factor	0.2048
R_work r_work	0.2048
R_free r_free	0.2678

Catalytic Domain of Human Calpain 8

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

Calpain-8

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

2nqa__assembly_1__model_1

2nqa__assembly_1__model_1 | I(q)

2nqa__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)

Catalytic Domain of Human Calpain 8

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

Calpain-8

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

2nqa__assembly_1__model_1

2nqa__assembly_1__model_1 | I(q)

2nqa__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)