← Back to search
1ckq

PRE-TRANSITION STATE ECO RI ENDONUCLEASE/COGNATE DNA (TCGCGAATTCGCG) COMPLEX

Method: X-RAY DIFFRACTION
▼

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

PROTEIN (ENDONUCLEASE)

OrganismNot specified

UniProt P00642

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 ;DNA (5'-D(*TP*CP*GP*CP*GP*AP*AP*TP*TP*CP*GP*CP*G)-3') ; × 2 water × 4 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer

None

Homodimer
1qc9 1qc9

2 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1ckq 1cl8 1eri 1qps 1qrh 1qri 2oxv

7 assemblies

View Construct and Data Evidence
UniProt name T2E1_ECOLI
Isoform —
PDB entities 2
Chains and sequence ranges Author chain A； PDBConstruct 1–276； UniProt 1–276

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id1ckq
Deposition date deposition_date1999-04-22
Structure title titlePRE-TRANSITION STATE ECO RI ENDONUCLEASE/COGNATE DNA (TCGCGAATTCGCG) COMPLEX
Keywords keywordsSEQUENCE-SPECIFIC DNA-PROTEIN COMPLEX, PROTEIN-DNA COMPLEX; PROTEIN/DNA
Experimental Method methodX-RAY DIFFRACTION
▼

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.

1ckq__assembly_1__model_1

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

Download this curve (.dat)

1ckq__assembly_1__model_1 | I(q)

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

1ckq__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）25.46 Å
Rg (electron density)24.75 Å
Total Rg25.51 Å
Atom count4628
Residues548
Excluded volume80753 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1ckq__assembly_1__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (3)

▼

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_idd1ckqa_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.52 — Restriction endonuclease-like
Superfamily Superfamily superfamilyc.52.1 — Restriction endonuclease-like
Family Family familyc.52.1.1 — Restriction endonuclease EcoRI

CATH v4.4 (1 domains)

Domain ID domain_id1ckqA00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology580 — ECO RI Endonuclease; Chain A
Homologous superfamily homologous superfamily10 — Eco RI Endonuclease, subunit A
▶

7. Citations (1)