SAXSdb — 1lmb

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

PROTEIN (LAMBDA REPRESSOR)

OrganismNot specified

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(APAPTPAPCPCPAPCPTPGPGPCPGPGPTPGPA PTPAPT)-3') ; × 1 ;DNA (5'-D(TPAPTPAPTPCPAPCPCPGPCPCPAPGPTPGPG PTPAPT)-3') ; × 1 water × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPC1_LAMBD
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain 3； PDBConstruct 1–92； UniProt 1–92 Author chain 4； PDBConstruct 1–92； UniProt 1–92

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_id	1lmb
Deposition date deposition_date	1991-11-05
Structure title title	REFINED 1.8 ANGSTROM CRYSTAL STRUCTURE OF THE LAMBDA REPRESSOR-OPERATOR COMPLEX
Keywords keywords	PROTEIN-DNA COMPLEX, DOUBLE HELIX, TRANSCRIPTION-DNA COMPLEX; TRANSCRIPTION/DNA
Experimental Method method	X-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.

1lmb__assembly_1__model_1

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

Download this curve (.dat)

1lmb__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1lmb__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	22.17 Å
Rg (electron density)	21.29 Å
Total Rg	22.05 Å
Atom count	2194
Residues	219
Excluded volume	36680 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1lmb__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)

Entity 1 Entity 1 polymer

Description description	;DNA (5'-D(APAPTPAPCPCPAPCPTPGPGPCPGPGPTPGPA PTPAPT)-3') ;
Molecular weight formula_weight	6158.0 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	1
Atom count atom_count	2334

AATACCACTGGCGGTGATAT

Entity 2 Entity 2 polymer

Description description	;DNA (5'-D(TPAPTPAPTPCPAPCPCPGPCPCPAPGPTPGPG PTPAPT)-3') ;
Molecular weight formula_weight	6109.0 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	2

TATATCACCGCCAGTGGTAT

Entity 3 Entity 3 polymer

Description description	PROTEIN (LAMBDA REPRESSOR)
Molecular weight formula_weight	10136.6 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	3,4

STKKKPLTQEQLEDARRLKAIYEKKKNELGLSQESVADKMGMGQSGVGALFNGINALNAYNAALLAKILKVSVEEFSPSIAREIYEMYEAVS

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	140

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1lmb3_
Class class	a — All alpha proteins
Fold Fold fold	a.35 — lambda repressor-like DNA-binding domains
Superfamily Superfamily superfamily	a.35.1 — lambda repressor-like DNA-binding domains
Family Family family	a.35.1.2 — Phage repressors

Domain ID domain_id	d1lmb4_
Class class	a — All alpha proteins
Fold Fold fold	a.35 — lambda repressor-like DNA-binding domains
Superfamily Superfamily superfamily	a.35.1 — lambda repressor-like DNA-binding domains
Family Family family	a.35.1.2 — Phage repressors

CATH v4.4 (2 domains)

Domain ID domain_id	1lmb300
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	260 — 434 Repressor (Amino-terminal Domain)
Homologous superfamily homologous superfamily	40 — lambda repressor-like DNA-binding domains

Domain ID domain_id	1lmb400
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	260 — 434 Repressor (Amino-terminal Domain)
Homologous superfamily homologous superfamily	40 — lambda repressor-like DNA-binding domains

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7. Citations (8)

Refined 1.8 A crystal structure of the lambda repressor-operator complex.

J.Mol.Biol. (1992)

PMID: 1387915 · DOI: 10.1016/0022-2836(92)90690-L PRIMARY

The DNA Binding Arm of a Lambda Repressor: Critical Contacts from a Flexible Region

Science (1991)

Conserved Residues Make Similar Contacts in Two Repressor-Operator Complexes

Science (1990)

Comparison of the Structures of Cro and Lambda Repressor Proteins from Bacteriophage Lambda

J.Mol.Biol. (1983)

Structure of the Operator-Binding Domain of Bacteriophage Lambda Repressor. Implications for DNA Recognition and Gene Regulation

Cold Spring Harbor Symp.Quant.Biol. (1983)

Homology Among DNA-Binding Proteins Suggests Use of a Conserved Super-Secondary Structure

Nature (1982)

The Operator-Binding Domain of Lambda Repressor. Structure and DNA Recognition

Nature (1982)

The N-Terminal Arms of Lambda Repressor Wrap Around the Operator DNA

Nature (1982)

Unit-cell length a length_a	37.220 Å
Unit-cell length b length_b	68.720 Å
Unit-cell length c length_c	57.030 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	92.20 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.1890
R_work r_work	0.1890
R_free r_free	—

REFINED 1.8 ANGSTROM CRYSTAL STRUCTURE OF THE LAMBDA REPRESSOR-OPERATOR COMPLEX

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

PROTEIN (LAMBDA REPRESSOR)

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1lmb__assembly_1__model_1

1lmb__assembly_1__model_1 | I(q)

1lmb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (8)

REFINED 1.8 ANGSTROM CRYSTAL STRUCTURE OF THE LAMBDA REPRESSOR-OPERATOR COMPLEX

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

PROTEIN (LAMBDA REPRESSOR)

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1lmb__assembly_1__model_1

1lmb__assembly_1__model_1 | I(q)

1lmb__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (8)