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1b3l

OLIGO-PEPTIDE BINDING PROTEIN (OPPA) COMPLEXED WITH KGK

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

PROTEIN (OLIGO-PEPTIDE BINDING PROTEIN)

Salmonella typhimurium

UniProt P06202

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 2 PROTEIN (LYS-GLY-LYS) × 1 water × 2 Consistent with protein count
2 Protein heterocomplex Heteromer Protein 2 PROTEIN (LYS-GLY-LYS) × 1 URANYL (VI) ION × 1 water × 2 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
1rkm 2rkm

2 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1b05 1b1h 1b2h 1b32 1b3f 1b3g 1b3h 1b3l 1b3l 1b40 1b46 1b4z

29 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name OPPA_SALTY
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–517； UniProt 26–542 Author chain C； PDBConstruct 1–517； UniProt 26–542

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_id1b3l
Deposition date deposition_date1998-12-14
Structure title titleOLIGO-PEPTIDE BINDING PROTEIN (OPPA) COMPLEXED WITH KGK
Keywords keywordsCOMPLEX (PEPTIDE TRANSPORT-PEPTIDE), PEPTIDE TRANSPORT, PEPTIDE BINDING PROTEIN; PEPTIDE BINDING 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.

1b3l__assembly_2__model_1

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

Download this curve (.dat)

1b3l__assembly_2__model_1 | I(q)

10-2 10-1 105 106 107 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

1b3l__assembly_2__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）24.20 Å
Rg (electron density)23.22 Å
Total Rg24.25 Å
Atom count4189
Residues520
Excluded volume74477 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1b3l__assembly_1__model_1 dimeric （2） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 1b3l__assembly_2__model_1 dimeric （2） 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) 8 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1b3la_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.94 — Periplasmic binding protein-like II
Superfamily Superfamily superfamilyc.94.1 — Periplasmic binding protein-like II
Family Family familyc.94.1.1 — Phosphate binding protein-like
Domain ID domain_idd1b3lc_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.94 — Periplasmic binding protein-like II
Superfamily Superfamily superfamilyc.94.1 — Periplasmic binding protein-like II
Family Family familyc.94.1.1 — Phosphate binding protein-like

CATH v4.4 (6 domains)

Domain ID domain_id1b3lA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id1b3lA02
Class class3 — Alpha Beta
Architecture architecture90 — Alpha-Beta Complex
Topology topology76 — Dipeptide-binding Protein; domain 1
Homologous superfamily homologous superfamily10 — Dipeptide-binding Protein; Domain 1
Domain ID domain_id1b3lA03
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology105 — Dipeptide-binding Protein; domain 3
Homologous superfamily homologous superfamily10 — Dipeptide-binding Protein; Domain 3
Domain ID domain_id1b3lC01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily10 — Periplasmic binding protein-like II
Domain ID domain_id1b3lC02
Class class3 — Alpha Beta
Architecture architecture90 — Alpha-Beta Complex
Topology topology76 — Dipeptide-binding Protein; domain 1
Homologous superfamily homologous superfamily10 — Dipeptide-binding Protein; Domain 1
Domain ID domain_id1b3lC03
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology105 — Dipeptide-binding Protein; domain 3
Homologous superfamily homologous superfamily10 — Dipeptide-binding Protein; Domain 3
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7. Citations (5)