3udc

Crystal structure of a membrane protein

Method: X-RAY DIFFRACTION

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

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Homooligomer	Protein 7	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MSCS_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 271–285； UniProt 272–286 Author chain B； PDBConstruct 271–285； UniProt 272–286 Author chain C； PDBConstruct 271–285； UniProt 272–286 Author chain D； PDBConstruct 271–285； UniProt 272–286 Author chain E； PDBConstruct 271–285； UniProt 272–286 Author chain F； PDBConstruct 271–285； UniProt 272–286 Author chain G； PDBConstruct 271–285； UniProt 272–286

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

Escherichia coli

UniProt Q8R6L9

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Homooligomer	Protein 7	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8R6L9_THETN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–270； UniProt 1–270 Author chain B； PDBConstruct 1–270； UniProt 1–270 Author chain C； PDBConstruct 1–270； UniProt 1–270 Author chain D； PDBConstruct 1–270； UniProt 1–270 Author chain E； PDBConstruct 1–270； UniProt 1–270 Author chain F； PDBConstruct 1–270； UniProt 1–270 Author chain G； PDBConstruct 1–270； UniProt 1–270

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	3udc
Deposition date deposition_date	2011-10-28
Structure title title	Crystal structure of a membrane protein
Keywords keywords	membrane protein, channel, Mechanosensitive; MEMBRANE PROTEIN
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.

3udc__assembly_1__model_1

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

Download this curve (.dat)

3udc__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3udc__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	40.46 Å
Rg (electron density)	40.43 Å
Total Rg	40.86 Å
Atom count	14903
Residues	1869
Excluded volume	272590 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3udc__assembly_1__model_1`	heptameric （7）	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 (1)

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6. Fold Classification (SCOP + CATH) 21 domains

CATH v4.4 (21 domains)

Domain ID domain_id	3udcA01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcA02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcA03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcB01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcB02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcB03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcC01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcC02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcC03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcD01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcD02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcD03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcE01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcE02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcE03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcF01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcF02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcF03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

Domain ID domain_id	3udcG01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	1260 —

Domain ID domain_id	3udcG02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	3udcG03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	100 —

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Unit-cell length a length_a	96.046 Å
Unit-cell length b length_b	139.468 Å
Unit-cell length c length_c	224.113 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	28

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	3.355 Å
Low-resolution limit resolution_low	42.083 Å
R factor r_factor	0.2490
R_work r_work	0.2477
R_free r_free	0.2735

Description description	Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel
Molecular weight formula_weight	32462.2 kDa
Source method src_method	man
Copy count entity_count	7

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G
Atom count atom_count	14903

Crystal structure of a membrane protein

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

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

State in the Current Structure

Other States of the Same Protein in the Database

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

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

3udc__assembly_1__model_1

3udc__assembly_1__model_1 | I(q)

3udc__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 21 domains

CATH v4.4 (21 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli

Crystal structure of a membrane protein

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

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Small-conductance mechanosensitive channel, C-terminal peptide from Small-conductance mechanosensitive channel

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

3udc__assembly_1__model_1

3udc__assembly_1__model_1 | I(q)

3udc__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 21 domains

CATH v4.4 (21 domains)

7. Citations (1)