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4j7c

KtrAB potassium transporter from Bacillus subtilis

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Ktr system potassium uptake protein A

Bacillus subtilis

UniProt O32080

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 10 Ktr system potassium uptake protein B × 2 （O32081） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 2 Consistent with protein count
2 Protein heterocomplex Heteromer Protein 10 Ktr system potassium uptake protein B × 2 （O32081） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 2 Consistent with protein count
3 Protein heterocomplex Heteromer Protein 12 Ktr system potassium uptake protein B × 4 （O32081） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 4 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
1lsu 1lsu

2 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers
2hms 2hmt 2hmu 2hmv 2hmw 4j90 4j91 6s2j 6s5b 6s5c 6s5d 6s5e

21 assemblies; showing the first 12

Heteromeric or nucleic-acid complex
4j7c 4j7c 4j7c 5but 8k1s 8k1t 8k1u 8poo 8poo 8xmh 8xmi

11 assemblies

View Construct and Data Evidence
UniProt name KTRA_BACSU
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–222； UniProt 1–222 Author chain B； PDBConstruct 1–222； UniProt 1–222 Author chain C； PDBConstruct 1–222； UniProt 1–222 Author chain D； PDBConstruct 1–222； UniProt 1–222 Author chain E； PDBConstruct 1–222； UniProt 1–222 Author chain F； PDBConstruct 1–222； UniProt 1–222 Author chain G； PDBConstruct 1–222； UniProt 1–222 Author chain H； PDBConstruct 1–222； UniProt 1–222

Ktr system potassium uptake protein B

Bacillus subtilis

UniProt O32081

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 10 Ktr system potassium uptake protein A × 8 （O32080） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 2 Consistent with protein count
2 Protein heterocomplex Heteromer Protein 10 Ktr system potassium uptake protein A × 8 （O32080） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 2 Consistent with protein count
3 Protein heterocomplex Heteromer Protein 12 Ktr system potassium uptake protein A × 8 （O32080） ADENOSINE-5'-TRIPHOSPHATE × 8 POTASSIUM ION × 4 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer
5but

1 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
4j7c 4j7c 4j7c 5but 8k1s 8k1t 8k1u 8poo 8poo 8xmh 8xmi

11 assemblies

View Construct and Data Evidence
UniProt name KTRB_BACSU
Isoform —
PDB entities 2
Chains and sequence ranges Author chain I； PDBConstruct 21–465； UniProt 1–445 Author chain J； PDBConstruct 21–465； UniProt 1–445 Author chain K； PDBConstruct 21–465； UniProt 1–445 Author chain L； PDBConstruct 21–465； UniProt 1–445

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_id4j7c
Deposition date deposition_date2013-02-13
Structure title titleKtrAB potassium transporter from Bacillus subtilis
Keywords keywords;KtrB pore-forming membrane protein, KtrA regulatory cytosolic ring, Potassium ion transport, Potassium, cell membrane, cytosol, TRANSPORT PROTEIN ;; TRANSPORT PROTEIN
Experimental Method methodX-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.

4j7c__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4j7c__assembly_3__model_1 | I(q)

10-2 10-1 106 107 108 109 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

4j7c__assembly_3__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）51.64 Å
Rg (electron density)51.85 Å
Total Rg51.91 Å
Atom count26996
Residues3448
Excluded volume490310 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 4j7c__assembly_1__model_1 decameric （10） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 4j7c__assembly_2__model_1 decameric （10） Success 4.1.3-1-20251215 (887e7ef) View Download
3 1 4j7c__assembly_3__model_1 dodecameric （12） 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 (4)

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6. Fold Classification (SCOP + CATH) 16 domains

CATH v4.4 (16 domains)

Domain ID domain_id4j7cA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cA02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cB01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cB02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cC01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cC02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cD01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cD02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cE01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cE02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cF01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cF02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cG01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cG02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
Domain ID domain_id4j7cH01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily720 — NAD(P)-binding Rossmann-like Domain
Domain ID domain_id4j7cH02
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily1450 — Regulator of K+ conductance, C-terminal domain
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7. Citations (1)