1ted

Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis

Method: X-RAY DIFFRACTION

▼

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

pks18

Mycobacterium tuberculosis

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q7D8I1_MYCTU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–393； UniProt 1–393 Author chain B； PDBConstruct 1–393； UniProt 1–393 Author chain C； PDBConstruct 1–393； UniProt 1–393 Author chain D； PDBConstruct 1–393； UniProt 1–393

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_id	1ted
Deposition date deposition_date	2004-05-25
Structure title title	Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis
Keywords keywords	thiolase fold, substrate binding tunnel, TRANSFERASE; TRANSFERASE
Experimental Method method	X-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.

1ted__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1ted__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ted__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	26.65 Å
Rg (electron density)	25.30 Å
Total Rg	26.13 Å
Atom count	5460
Residues	727
Excluded volume	98092 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ted__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1ted__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	pks18
Molecular weight formula_weight	42073.3 kDa
EC 编号 ec_number	2.3.1.74
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	12026

MNVSAESGAPRRAGQRHEVGLAQLPPAPPTTVAVIEGLATGTPRRVVNQSDAADRVAELFLDPGQRERIPRVYQKSRITTRRMAVDPLDAKFDVFRREPATIRDRMHLFYEHAVPLAVDVSKRALAGLPYRAAEIGLLVLATSTGFIAPGVDVAIVKELGLSPSISRVVVNFMGCAAAMNALGTATNYVRAHPAMKALVVCIELCSVNAVFADDINDVVIHSLFGDGCAALVIGASQVQEKLEPGKVVVRSSFSQLLDNTEDGIVLGVNHNGITCELSENLPGYIFSGVAPVVTEMLWDNGLQISDIDLWAIHPGGPKIIEQSVRSLGISAELAAQSWDVLARFGNMLSVSLIFVLETMVQQAESAKAISTGVAFAFGPGVTVEGMLFDIIRR

Source Source

Source organism organism	Mycobacterium tuberculosis
NCBI taxonomy ID ncbi_taxonomy_id	83332
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	MYRISTIC ACID
Molecular weight formula_weight	228.4 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	1106

▼

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1teda1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1teda2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedb1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedc1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedc2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedd1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

Domain ID domain_id	d1tedd2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.95 — Thiolase-like
Superfamily Superfamily superfamily	c.95.1 — Thiolase-like
Family Family family	c.95.1.2 — Chalcone synthase-like

CATH v4.4 (8 domains)

Domain ID domain_id	1tedA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedC01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedC02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedD01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

Domain ID domain_id	1tedD02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	47 — Peroxisomal Thiolase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Thiolase/Chalcone synthase

▶

Unit-cell length a length_a	59.914 Å
Unit-cell length b length_b	80.654 Å
Unit-cell length c length_c	99.612 Å
Unit-cell angle α angle_alpha	108.23 °
Unit-cell angle β angle_beta	92.97 °
Unit-cell angle γ angle_gamma	103.69 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	2.250 Å
Low-resolution limit resolution_low	24.870 Å
R factor r_factor	0.2050
R_work r_work	0.2050
R_free r_free	0.2650

Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis

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

pks18

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

1ted__assembly_2__model_1

1ted__assembly_2__model_1 | I(q)

1ted__assembly_2__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) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (2)

Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis

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

pks18

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

1ted__assembly_2__model_1

1ted__assembly_2__model_1 | I(q)

1ted__assembly_2__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) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (2)