SAXSdb — 3brc

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

Conserved protein of unknown function

Methanothermobacter thermautotrophicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	PHOSPHATE ION × 3 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 4	PHOSPHATE ION × 6 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	O27213_METTH
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–156； UniProt 1–156 Author chain B； PDBConstruct 1–156； UniProt 1–156

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	3brc
Deposition date deposition_date	2007-12-21
Structure title title	Crystal structure of a conserved protein of unknown function from Methanobacterium thermoautotrophicum
Keywords keywords	;Conserved protein, Methanobacterium thermoautotrophicum, Structural genomics, MCSG, PSI-2, Protein Structure Initiative, Midwest Center for 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.

3brc__assembly_2__model_1

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

Download this curve (.dat)

3brc__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3brc__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	24.57 Å
Rg (electron density)	23.34 Å
Total Rg	23.91 Å
Atom count	4904
Residues	594
Excluded volume	86898 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3brc__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3brc__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Description description	Conserved protein of unknown function
Molecular weight formula_weight	17893.5 kDa
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	2678

MLEDLIGKAYLESAEDRRRGDRSEEVEAIRKYIRSARRTVVPNWNAEKVDAINDVLRSFNLREAEHLQFNTNWADLTRMPAVTKALMALDISGADLVIARGRLGVPGSGSLLVIMDSRGRLLSAAMSPPHVIHSMEVREAVRSEMTHALERIGFKR

Source Source

Source organism organism	Methanothermobacter thermautotrophicus
NCBI taxonomy ID ncbi_taxonomy_id	187420
Host organism host_organism	Escherichia coli BL21

Entity 2 Entity 2 non-polymer

Description description	PHOSPHATE ION
Molecular weight formula_weight	95.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	226

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6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	3brcA01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	470 — Helix hairpin bin

Domain ID domain_id	3brcA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	10150 — B12-dependent dehydatase associated subunit

Domain ID domain_id	3brcB01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	470 — Helix hairpin bin

Domain ID domain_id	3brcB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	10150 — B12-dependent dehydatase associated subunit

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Unit-cell length a length_a	106.894 Å
Unit-cell length b length_b	48.916 Å
Unit-cell length c length_c	63.868 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	118.54 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	1.600 Å
Low-resolution limit resolution_low	56.080 Å
R factor r_factor	0.1859
R_work r_work	0.1832
R_free r_free	0.2367

Crystal structure of a conserved protein of unknown function from Methanobacterium thermoautotrophicum

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

Conserved protein of unknown function

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

3brc__assembly_2__model_1

3brc__assembly_2__model_1 | I(q)

3brc__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 (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) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)

Crystal structure of a conserved protein of unknown function from Methanobacterium thermoautotrophicum

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

Conserved protein of unknown function

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

3brc__assembly_2__model_1

3brc__assembly_2__model_1 | I(q)

3brc__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 (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) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)