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1cma

MET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE

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

PROTEIN (MET REPRESSOR)

OrganismNot specified

UniProt P0A8U6

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–DNA Homooligomer Protein 4 DNA 4 ;DNA (5'-D(*TP*TP*AP*GP*AP*CP*GP*TP*CP*T)-3') ; × 2 ;DNA (5'-D(*AP*GP*AP*CP*GP*TP*CP*TP*A)-3') ; × 2 S-ADENOSYLMETHIONINE × 4 water × 8 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer

None

Homodimer
1cmb 1cmc 1mjk 1mjl

4 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1cma 1mj2 1mjm 1mjo 1mjp 1mjq 1mjq

7 assemblies

View Construct and Data Evidence
UniProt name METJ_ECOLI
Isoform —
PDB entities 3
Chains and sequence ranges Author chain A； PDBConstruct 1–104； UniProt 1–104 Author chain B； PDBConstruct 1–104； UniProt 1–104

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_id1cma
Deposition date deposition_date1992-08-24
Structure title titleMET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE
Keywords keywordsPROTEIN-DNA COMPLEX, DOUBLE HELIX, 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.

1cma__assembly_1__model_1

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

Download this curve (.dat)

1cma__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.

1cma__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）29.69 Å
Rg (electron density)29.61 Å
Total Rg30.07 Å
Atom count4260
Residues454
Excluded volume72866 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1cma__assembly_1__model_1 octameric （8） 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 (5)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1cmaa_
Class classa — All alpha proteins
Fold Fold folda.43 — Ribbon-helix-helix
Superfamily Superfamily superfamilya.43.1 — Ribbon-helix-helix
Family Family familya.43.1.5 — Met repressor, MetJ (MetR)
Domain ID domain_idd1cmab_
Class classa — All alpha proteins
Fold Fold folda.43 — Ribbon-helix-helix
Superfamily Superfamily superfamilya.43.1 — Ribbon-helix-helix
Family Family familya.43.1.5 — Met repressor, MetJ (MetR)

CATH v4.4 (2 domains)

Domain ID domain_id1cmaA00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology140 — MET Apo-Repressor, subunit A
Homologous superfamily homologous superfamily10 — MET Apo-Repressor, subunit A
Domain ID domain_id1cmaB00
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology140 — MET Apo-Repressor, subunit A
Homologous superfamily homologous superfamily10 — MET Apo-Repressor, subunit A
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7. Citations (2)