SAXSdb — 1j3n

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

3-oxoacyl-(acyl-carrier protein) synthase II

Thermus thermophilus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	CITRIC ACID × 1 MAGNESIUM ION × 1 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 4	CITRIC ACID × 2 MAGNESIUM ION × 2 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q7SIC5_THETH
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–408； UniProt 1–408 Author chain B； PDBConstruct 1–408； UniProt 1–408

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	1j3n
Deposition date deposition_date	2003-02-10
Structure title title	Crystal Structure of 3-oxoacyl-(acyl-carrier protein) Synthase II from Thermus thermophilus HB8
Keywords keywords	;Condensing Enzymes, Fatty acid elongation, Acyl-carrier protein (ACP), Beta-keto-ACP synthase (KAS), Homodimer, Structural genomics, RIKEN Structural Genomics/Proteomics Initiative, RSGI, TRANSFERASE ;; TRANSFERASE
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.

1j3n__assembly_2__model_1

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

Download this curve (.dat)

1j3n__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1j3n__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	37.37 Å
Rg (electron density)	37.00 Å
Total Rg	37.35 Å
Atom count	12184
Residues	1632
Excluded volume	216930 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1j3n__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1j3n__assembly_2__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	3-oxoacyl-(acyl-carrier protein) synthase II
Molecular weight formula_weight	43262.5 kDa
EC 编号 ec_number	2.3.1.41
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	6556

MRRVVVTGLGALTPIGVGQEAFHKAQLAGKSGVRPITRFDASALPVRIAAEVDVDPGAYLDRKELRRLDRFVQYALIAAQLALEDAGLKPEDLDPERVGTLVGTGIGGMETWEAQSRVFLERGPNRISPFFIPMMIANMASAHIAMRYGFTGPSSTVVTACATGADALGSALRMIQLGEADLVLAGGTEAAITPMAIGAFAVMRALSTRNEEPEKASRPFTLSRDGFVMGEGAGVLVLEAYEHAKKRGARIYAELVGFGRSADAHHITEPHPEGKGAALAMARALKDAGIAPEQVGYINAHGTSTPVGDRAEVLAIKRVFGDHAKRLMVSSTKSMIGHLLGAAGAVEAIATVQALYHGVIPPTINLEDPDPELDLDFVPEPREAKVDYALSNSFAFGGHNAVLAFKRV

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	274
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	CITRIC ACID
Molecular weight formula_weight	192.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 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	462

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1j3na1
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.95.1.1 — Thiolase-related

Domain ID domain_id	d1j3na2
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.95.1.1 — Thiolase-related

Domain ID domain_id	d1j3nb1
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.95.1.1 — Thiolase-related

Domain ID domain_id	d1j3nb2
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.95.1.1 — Thiolase-related

CATH v4.4 (4 domains)

Domain ID domain_id	1j3nA01
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	1j3nA02
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	1j3nB01
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	1j3nB02
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

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Unit-cell length a length_a	72.067 Å
Unit-cell length b length_b	185.573 Å
Unit-cell length c length_c	62.517 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	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	—
R_work r_work	0.2100
R_free r_free	0.2576

Crystal Structure of 3-oxoacyl-(acyl-carrier protein) Synthase II from Thermus thermophilus HB8

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

3-oxoacyl-(acyl-carrier protein) synthase II

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

1j3n__assembly_2__model_1

1j3n__assembly_2__model_1 | I(q)

1j3n__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 (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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Crystal Structure of 3-oxoacyl-(acyl-carrier protein) Synthase II from Thermus thermophilus HB8

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

3-oxoacyl-(acyl-carrier protein) synthase II

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

1j3n__assembly_2__model_1

1j3n__assembly_2__model_1 | I(q)

1j3n__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 (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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)