SAXSdb — 3g85

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

Transcriptional regulator (LacI family)

Clostridium acetobutylicum ATCC 824

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	GLYCEROL × 1 water × 1	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	GLYCEROL × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q97DC5_CLOAB
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–281； UniProt 58–335

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	3g85
Deposition date deposition_date	2009-02-11
Structure title title	Crystal structure of LacI family transcription regulator from Clostridium acetobutylicum
Keywords keywords	;Transcription regulator, PSI-II, 11230o, Structural Genomics, Protein Structure Initiative, New York SGX Research Center for Structural Genomics, NYSGXRC, New York Structural GenomiX Research Consortium, DNA-binding, Transcription, Transcription regulation ;; TRANSCRIPTION REGULATOR
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.

3g85__assembly_1__model_1

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

Download this curve (.dat)

3g85__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3g85__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.71 Å
Rg (electron density)	20.02 Å
Total Rg	20.76 Å
Atom count	2117
Residues	265
Excluded volume	38190 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3g85__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3g85__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 (3)

Entity 1 Entity 1 polymer

Description description	Transcriptional regulator (LacI family)
Molecular weight formula_weight	32616.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	2331

MSLRSKNSQSKPTIALYWSSDISVNIISRFLRGLQSKLAKQNYNYNVVICPYKTDCLHLEKGISKENSFDAAIIANISNYDLEYLNKASLTLPIILFNRLSNKYSSVNVDNYKMGEKASLLFAKKRYKSAAAILTESLNDAMDNRNKGFIETCHKNGIKISENHIIAAENSIHGGVDAAKKLMKLKNTPKALFCNSDSIALGVISVLNKRQISIPDDIEIVAIGMNDREYTEFSTPPVTIVDIPIEEMAGTCISLVEKLINRDIENPTSILFDGPLILRNSEGHHHHHH

Source Source

Source organism organism	Clostridium acetobutylicum ATCC 824
NCBI taxonomy ID ncbi_taxonomy_id	272562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	214

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6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d3g85a_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.93 — Periplasmic binding protein-like I
Superfamily Superfamily superfamily	c.93.1 — Periplasmic binding protein-like I
Family Family family	c.93.1.0 — automated matches

CATH v4.4 (2 domains)

Domain ID domain_id	3g85A01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

Domain ID domain_id	3g85A02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

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Unit-cell length a length_a	70.024 Å
Unit-cell length b length_b	96.058 Å
Unit-cell length c length_c	99.976 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	1.840 Å
Low-resolution limit resolution_low	28.300 Å
R factor r_factor	0.1862
R_work r_work	0.1839
R_free r_free	0.2303

Crystal structure of LacI family transcription regulator from Clostridium acetobutylicum

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

Transcriptional regulator (LacI family)

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

3g85__assembly_1__model_1

3g85__assembly_1__model_1 | I(q)

3g85__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal structure of LacI family transcription regulator from Clostridium acetobutylicum

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

Transcriptional regulator (LacI family)

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

3g85__assembly_1__model_1

3g85__assembly_1__model_1 | I(q)

3g85__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

CATH v4.4 (2 domains)

7. Citations (1)