SAXSdb — 1k26

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

NUDIX HOMOLOG

Pyrobaculum aerophilum

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 2 IRIDIUM (III) ION × 4 NICKEL (II) ION × 2 GLYCEROL × 3 ACETIC ACID × 5 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8ZTD8_PYRAE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–142； UniProt 6–146 Author chain B； PDBConstruct 2–142； UniProt 6–146

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	1k26
Deposition date deposition_date	2001-09-26
Structure title title	Structure of a Nudix Protein from Pyrobaculum aerophilum Solved by the Single Wavelength Anomolous Scattering Method
Keywords keywords	NUDIX/MUTT-LIKE FOLD, MIXED ALPHA/BETA, DIMER, PUTATIVE NUDIX HYDROLASE, STRUCTURAL GENOMICS, UNKNOWN FUNCTION; STRUCTURAL GENOMICS, UNKNOWN FUNCTION
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.

1k26__assembly_1__model_1

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

Download this curve (.dat)

1k26__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1k26__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	21.84 Å
Rg (electron density)	20.53 Å
Total Rg	21.63 Å
Atom count	2426
Residues	297
Excluded volume	43987 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1k26__assembly_1__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 (7)

Entity 1 Entity 1 polymer

Description description	NUDIX HOMOLOG
Molecular weight formula_weight	17813.6 kDa
Mutation mutation	M16L
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	2575

MIVTSGVLVENGKVLLVKHKRLGVYIYPGGHVEHNETPIEAVKREFEEETGIVVEPIGFTYGIIDENAVERPMPLVILEEVVKYPEETHIHFDLIYLVKRVGGDLKNGEWIDVREIDRIETFPNVRKVVSLALSTLYRLGKISKLAAALEHHHHHH

Source Source

Source organism organism	Pyrobaculum aerophilum
NCBI taxonomy ID ncbi_taxonomy_id	13773
Host organism host_organism	Escherichia coli BL21(DE3)

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 non-polymer

Description description	IRIDIUM (III) ION
Molecular weight formula_weight	192.2 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	NICKEL (II) ION
Molecular weight formula_weight	58.7 kDa
Source method src_method	syn
Copy count entity_count	2

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	3

Entity 6 Entity 6 non-polymer

Description description	ACETIC ACID
Molecular weight formula_weight	60.1 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	149

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1k26a1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.113 — Nudix
Superfamily Superfamily superfamily	d.113.1 — Nudix
Family Family family	d.113.1.1 — MutT-like

Domain ID domain_id	d1k26a2
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	d1k26b1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.113 — Nudix
Superfamily Superfamily superfamily	d.113.1 — Nudix
Family Family family	d.113.1.1 — MutT-like

Domain ID domain_id	d1k26b2
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 (2 domains)

Domain ID domain_id	1k26A00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	79 — Nucleoside Triphosphate Pyrophosphohydrolase
Homologous superfamily homologous superfamily	10 — Nucleoside Triphosphate Pyrophosphohydrolase

Domain ID domain_id	1k26B00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	79 — Nucleoside Triphosphate Pyrophosphohydrolase
Homologous superfamily homologous superfamily	10 — Nucleoside Triphosphate Pyrophosphohydrolase

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Unit-cell length a length_a	52.424 Å
Unit-cell length b length_b	71.655 Å
Unit-cell length c length_c	85.762 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	1.850 Å
Low-resolution limit resolution_low	19.850 Å
R factor r_factor	—
R_work r_work	0.1830
R_free r_free	0.2190

Structure of a Nudix Protein from Pyrobaculum aerophilum Solved by the Single Wavelength Anomolous Scattering Method

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

NUDIX HOMOLOG

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

1k26__assembly_1__model_1

1k26__assembly_1__model_1 | I(q)

1k26__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 (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) 6 domains

SCOP 2.08 (4 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Structure of a Nudix Protein from Pyrobaculum aerophilum Solved by the Single Wavelength Anomolous Scattering Method

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

NUDIX HOMOLOG

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

1k26__assembly_1__model_1

1k26__assembly_1__model_1 | I(q)

1k26__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 (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) 6 domains

SCOP 2.08 (4 domains)

CATH v4.4 (2 domains)

7. Citations (1)