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2r1j

Crystal Structure of the P22 c2 Repressor protein in complex with the synthetic operator 9T

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

Repressor protein C2

Enterobacteria phage P22

UniProt P69202

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–DNA Homooligomer Protein 2 DNA 2 5'-D(*DCP*DAP*DTP*DTP*DTP*DAP*DAP*DGP*DAP*DTP*DAP*DTP*DCP*DTP*DTP*DAP*DAP*DAP*DTP*DA)-3' × 1 5'-D(*DTP*DAP*DTP*DTP*DTP*DAP*DAP*DGP*DAP*DTP*DAP*DTP*DCP*DTP*DTP*DAP*DAP*DAP*DTP*DG)-3' × 1 water × 4 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer
1adr

1 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
2r1j 3jxb 3jxc 3jxd

4 assemblies

View Construct and Data Evidence
UniProt name RPC2_BPP22
Isoform —
PDB entities 3
Chains and sequence ranges Author chain L； PDBConstruct 1–68； UniProt 1–68 Author chain R； PDBConstruct 1–68； UniProt 1–68

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_id2r1j
Deposition date deposition_date2007-08-22
Structure title titleCrystal Structure of the P22 c2 Repressor protein in complex with the synthetic operator 9T
Keywords keywordsProtein-DNA complex, Helix-turn-helix, DNA-binding, Repressor, Transcription, Transcription regulation, TRANSCRIPTION-DNA COMPLEX; TRANSCRIPTION/DNA
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.

2r1j__assembly_1__model_1

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

Download this curve (.dat)

2r1j__assembly_1__model_1 | I(q)

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

2r1j__assembly_1__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）20.43 Å
Rg (electron density)19.56 Å
Total Rg20.34 Å
Atom count1844
Residues172
Excluded volume30453 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2r1j__assembly_1__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 (4)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2r1jl_
Class classa — All alpha proteins
Fold Fold folda.35 — lambda repressor-like DNA-binding domains
Superfamily Superfamily superfamilya.35.1 — lambda repressor-like DNA-binding domains
Family Family familya.35.1.2 — Phage repressors
Domain ID domain_idd2r1jr_
Class classa — All alpha proteins
Fold Fold folda.35 — lambda repressor-like DNA-binding domains
Superfamily Superfamily superfamilya.35.1 — lambda repressor-like DNA-binding domains
Family Family familya.35.1.2 — Phage repressors

CATH v4.4 (2 domains)

Domain ID domain_id2r1jL00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology260 — 434 Repressor (Amino-terminal Domain)
Homologous superfamily homologous superfamily40 — lambda repressor-like DNA-binding domains
Domain ID domain_id2r1jR00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology260 — 434 Repressor (Amino-terminal Domain)
Homologous superfamily homologous superfamily40 — lambda repressor-like DNA-binding domains
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7. Citations (1)