SAXSdb — 1knc

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

AhpD protein

Mycobacterium tuberculosis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	SULFATE ION × 17 water × 3	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 6	SULFATE ION × 34 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	AHPD_MYCTU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–177； UniProt 1–177 Author chain B； PDBConstruct 1–177； UniProt 1–177 Author chain C； PDBConstruct 1–177； UniProt 1–177

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	1knc
Deposition date deposition_date	2001-12-18
Structure title title	Structure of AhpD from Mycobacterium tuberculosis, a novel enzyme with thioredoxin-like activity.
Keywords keywords	AhpD, thioredoxin, disulfide, peroxiredoxin, lpd, redox, ELECTRON TRANSPORT; ELECTRON TRANSPORT
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.

1knc__assembly_1__model_1

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

Download this curve (.dat)

1knc__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1knc__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.20 Å
Rg (electron density)	21.87 Å
Total Rg	22.80 Å
Atom count	3973
Residues	521
Excluded volume	70214 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1knc__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1knc__assembly_2__model_1`	hexameric （6）	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	AhpD protein
Molecular weight formula_weight	18801.5 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	4311

MSIEKLKAALPEYAKDIKLNLSSITRSSVLDQEQLWGTLLASAAATRNPQVLADIGAEATDHLSAAARHAALGAAAIMGMNNVFYRGRGFLEGRYDDLRPGLRMNIIANPGIPKANFELWSFAVSAINGCSHCLVAHEHTLRTVGVDREAIFEALKAAAIVSGVAQALATIEALSPS

Source Source

Source organism organism	Mycobacterium tuberculosis
NCBI taxonomy ID ncbi_taxonomy_id	1773
Host organism host_organism	Escherichia coli

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	17

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	338

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1knca_
Class class	a — All alpha proteins
Fold Fold fold	a.152 — AhpD-like
Superfamily Superfamily superfamily	a.152.1 — AhpD-like
Family Family family	a.152.1.1 — AhpD

Domain ID domain_id	d1kncb_
Class class	a — All alpha proteins
Fold Fold fold	a.152 — AhpD-like
Superfamily Superfamily superfamily	a.152.1 — AhpD-like
Family Family family	a.152.1.1 — AhpD

Domain ID domain_id	d1kncc_
Class class	a — All alpha proteins
Fold Fold fold	a.152 — AhpD-like
Superfamily Superfamily superfamily	a.152.1 — AhpD-like
Family Family family	a.152.1.1 — AhpD

CATH v4.4 (3 domains)

Domain ID domain_id	1kncA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1290 — AhpD-like
Homologous superfamily homologous superfamily	10 — AhpD-like

Domain ID domain_id	1kncB00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1290 — AhpD-like
Homologous superfamily homologous superfamily	10 — AhpD-like

Domain ID domain_id	1kncC00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1290 — AhpD-like
Homologous superfamily homologous superfamily	10 — AhpD-like

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Unit-cell length a length_a	108.318 Å
Unit-cell length b length_b	108.318 Å
Unit-cell length c length_c	233.582 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	36

Space group space_group	P 65 2 2
Space-group number int_tables_number	179
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	—
R_work r_work	0.2160
R_free r_free	0.2430

Structure of AhpD from Mycobacterium tuberculosis, a novel enzyme with thioredoxin-like activity.

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

AhpD protein

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

1knc__assembly_1__model_1

1knc__assembly_1__model_1 | I(q)

1knc__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)

Structure of AhpD from Mycobacterium tuberculosis, a novel enzyme with thioredoxin-like activity.

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

AhpD protein

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

1knc__assembly_1__model_1

1knc__assembly_1__model_1 | I(q)

1knc__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)