SAXSdb — 3lah

▼

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

Methyl-accepting chemotaxis protein

Thermoanaerobacter tengcongensis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 IMIDAZOLE × 2 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 IMIDAZOLE × 2 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8RBX6_THETN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–188； UniProt 1–188 Author chain B； PDBConstruct 1–188； UniProt 1–188

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	3lah
Deposition date deposition_date	2010-01-06
Structure title title	Structural insights into the molecular mechanism of H-NOX activation
Keywords keywords	Signaling Protein; SIGNALING PROTEIN
Experimental Method method	X-RAY DIFFRACTION

▼

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.

3lah__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3lah__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3lah__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	18.47 Å
Rg (electron density)	17.28 Å
Total Rg	18.40 Å
Atom count	1598
Residues	188
Excluded volume	28781 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3lah__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3lah__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	Methyl-accepting chemotaxis protein
Molecular weight formula_weight	21966.4 kDa
Mutation mutation	H102G
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	3343

MKGTIVGTWIKTLRDLYGNDVVDESLKSVGWEPDRVITPLEDIDDDEVRRIFAKVSEKTGKNVNEIWREVGRQNIKTFSEWFPSYFAGRRLVNFLMMMDEVGLQLTKMIKGATPPRLIAKPVAKDAIEMEYVSKRKMYDYFLGLIEGSSKFFKEEISVEEVERGEKDGFSRLKVRIKFKNPVFEYKKN

Source Source

Source organism organism	Thermoanaerobacter tengcongensis
NCBI taxonomy ID ncbi_taxonomy_id	119072
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	IMIDAZOLE
Molecular weight formula_weight	69.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	147

▼

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3laha_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.278 — Ligand-binding domain in the NO signalling and Golgi transport
Superfamily Superfamily superfamily	d.278.1 — Ligand-binding domain in the NO signalling and Golgi transport
Family Family family	d.278.1.1 — H-NOX domain

Domain ID domain_id	d3lahb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.278 — Ligand-binding domain in the NO signalling and Golgi transport
Superfamily Superfamily superfamily	d.278.1 — Ligand-binding domain in the NO signalling and Golgi transport
Family Family family	d.278.1.1 — H-NOX domain

CATH v4.4 (2 domains)

Domain ID domain_id	3lahA00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1520 — H-NOX domain
Homologous superfamily homologous superfamily	10 — H-NOX domain

Domain ID domain_id	3lahB00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1520 — H-NOX domain
Homologous superfamily homologous superfamily	10 — H-NOX domain

▶

Unit-cell length a length_a	61.353 Å
Unit-cell length b length_b	88.713 Å
Unit-cell length c length_c	89.207 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	2.000 Å
Low-resolution limit resolution_low	44.600 Å
R factor r_factor	0.2170
R_work r_work	0.2151
R_free r_free	0.2513

Structural insights into the molecular mechanism of H-NOX activation

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

Methyl-accepting chemotaxis 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

3lah__assembly_2__model_1

3lah__assembly_2__model_1 | I(q)

3lah__assembly_2__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 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Structural insights into the molecular mechanism of H-NOX activation

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

Methyl-accepting chemotaxis 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

3lah__assembly_2__model_1

3lah__assembly_2__model_1 | I(q)

3lah__assembly_2__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 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)