SAXSdb — 1qca

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

TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE

Shigella flexneri

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	COBALT (II) ION × 6 FUSIDIC ACID × 3 water × 3	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 6	COBALT (II) ION × 12 FUSIDIC ACID × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CAT3_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–213； UniProt 1–213

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	1qca
Deposition date deposition_date	1995-08-03
Structure title title	QUADRUPLE MUTANT Q92C, N146F, Y168F, I172V TYPE III CAT COMPLEXED WITH FUSIDIC ACID. CRYSTALS GROWN AT PH 6.3. X-RAY DATA COLLECTED AT ROOM TEMPERATURE
Keywords keywords	CHLORAMPHENICOL, FUSIDATE, STEROID, TRANSFERASE (ACYLTRANSFERASE); TRANSFERASE (ACYLTRANSFERASE)
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.

1qca__assembly_1__model_1

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

Download this curve (.dat)

1qca__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1qca__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.34 Å
Rg (electron density)	24.90 Å
Total Rg	25.91 Å
Atom count	5175
Residues	633
Excluded volume	93158 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1qca__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1qca__assembly_2__model_1`	hexameric （6）	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	TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE
Molecular weight formula_weight	24999.6 kDa
EC 编号 ec_number	2.3.1.28
Mutation mutation	Q92C, N146F, Y168F, I172V
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	1869

MNYTKFDVKNWVRREHFEFYRHRLPCGFSLTSKIDITTLKKSLDDSAYKFYPVMIYLIAQAVNQFDELRMAIKDDELIVWDSVDPCFTVFHQETETFSALSCPYSSDIDQFMVNYLSVMERYKSDTKLFPQGVTPENHLFISALPWVNFDSFNLNVANFTDFFAPVITMAKYQQEGDRLLLPLSVQVHHAVCDGFHVARFINRLQELCNSKLK

Source Source

Source organism organism	Shigella flexneri
NCBI taxonomy ID ncbi_taxonomy_id	623
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	COBALT (II) ION
Molecular weight formula_weight	58.9 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	FUSIDIC ACID
Molecular weight formula_weight	516.7 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	144

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1qcaa_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.43 — CoA-dependent acyltransferases
Superfamily Superfamily superfamily	c.43.1 — CoA-dependent acyltransferases
Family Family family	c.43.1.1 — CAT-like

CATH v4.4 (1 domains)

Domain ID domain_id	1qcaA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	559 — Chloramphenicol Acetyltransferase
Homologous superfamily homologous superfamily	10 — Chloramphenicol acetyltransferase-like domain

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Unit-cell length a length_a	107.810 Å
Unit-cell length b length_b	107.810 Å
Unit-cell length c length_c	124.130 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	18

Space group space_group	H 3 2
Space-group number int_tables_number	155
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	6.000 Å
R factor r_factor	0.1740
R_work r_work	—
R_free r_free	—

QUADRUPLE MUTANT Q92C, N146F, Y168F, I172V TYPE III CAT COMPLEXED WITH FUSIDIC ACID. CRYSTALS GROWN AT PH 6.3. X-RAY DATA COLLECTED AT ROOM TEMPERATURE

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

TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE

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

1qca__assembly_1__model_1

1qca__assembly_1__model_1 | I(q)

1qca__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (4)

QUADRUPLE MUTANT Q92C, N146F, Y168F, I172V TYPE III CAT COMPLEXED WITH FUSIDIC ACID. CRYSTALS GROWN AT PH 6.3. X-RAY DATA COLLECTED AT ROOM TEMPERATURE

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

TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE

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

1qca__assembly_1__model_1

1qca__assembly_1__model_1 | I(q)

1qca__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (4)