SAXSdb — 1hqk

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

6,7-DIMETHYL-8-RIBITYLLUMAZINE SYNTHASE

Aquifex aeolicus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 60	water × 60	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RISB_AQUAE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–154； UniProt 1–154 Author chain B； PDBConstruct 1–154； UniProt 1–154 Author chain C； PDBConstruct 1–154； UniProt 1–154 Author chain D； PDBConstruct 1–154； UniProt 1–154 Author chain E； PDBConstruct 1–154； UniProt 1–154

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	1hqk
Deposition date deposition_date	2000-12-18
Structure title title	CRYSTAL STRUCTURE ANALYSIS OF LUMAZINE SYNTHASE FROM AQUIFEX AEOLICUS
Keywords keywords	LUMAZINE SYNTHASE, AQUIFEX AEOLICUS, X-RAY STRUCTURE ANALYSIS, ENZYME STABILITY, VITAMIN BIOSYNTHESIS, 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.

1hqk__assembly_1__model_1

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

Download this curve (.dat)

1hqk__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1hqk__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	64.58 Å
Rg (electron density)	63.24 Å
Total Rg	63.59 Å
Atom count	70620
Residues	9240
Excluded volume	1262700 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1hqk__assembly_1__model_1`	60-meric （60）	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 (2)

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (5 domains)

Domain ID domain_id	d1hqka_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.16 — Lumazine synthase
Superfamily Superfamily superfamily	c.16.1 — Lumazine synthase
Family Family family	c.16.1.1 — Lumazine synthase

Domain ID domain_id	d1hqkb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.16 — Lumazine synthase
Superfamily Superfamily superfamily	c.16.1 — Lumazine synthase
Family Family family	c.16.1.1 — Lumazine synthase

Domain ID domain_id	d1hqkc_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.16 — Lumazine synthase
Superfamily Superfamily superfamily	c.16.1 — Lumazine synthase
Family Family family	c.16.1.1 — Lumazine synthase

Domain ID domain_id	d1hqkd_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.16 — Lumazine synthase
Superfamily Superfamily superfamily	c.16.1 — Lumazine synthase
Family Family family	c.16.1.1 — Lumazine synthase

Domain ID domain_id	d1hqke_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.16 — Lumazine synthase
Superfamily Superfamily superfamily	c.16.1 — Lumazine synthase
Family Family family	c.16.1.1 — Lumazine synthase

CATH v4.4 (5 domains)

Domain ID domain_id	1hqkA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	960 — Lumazine/riboflavin synthase

Domain ID domain_id	1hqkB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	960 — Lumazine/riboflavin synthase

Domain ID domain_id	1hqkC00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	960 — Lumazine/riboflavin synthase

Domain ID domain_id	1hqkD00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	960 — Lumazine/riboflavin synthase

Domain ID domain_id	1hqkE00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	960 — Lumazine/riboflavin synthase

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Unit-cell length a length_a	180.820 Å
Unit-cell length b length_b	180.820 Å
Unit-cell length c length_c	180.820 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	120

Space group space_group	I 2 3
Space-group number int_tables_number	197
Crystal system crystal_system	—

Resolution resolution	1.600 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	—
R_work r_work	0.2160
R_free r_free	0.2360

Description description	6,7-DIMETHYL-8-RIBITYLLUMAZINE SYNTHASE
Molecular weight formula_weight	16727.2 kDa
EC 编号 ec_number	2.5.1.78
Source method src_method	man
Copy count entity_count	5

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E
Atom count atom_count	6685

CRYSTAL STRUCTURE ANALYSIS OF LUMAZINE SYNTHASE FROM AQUIFEX AEOLICUS

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

6,7-DIMETHYL-8-RIBITYLLUMAZINE SYNTHASE

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

1hqk__assembly_1__model_1

1hqk__assembly_1__model_1 | I(q)

1hqk__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (5 domains)

CATH v4.4 (5 domains)

7. Citations (1)

Source organism organism	Aquifex aeolicus
NCBI taxonomy ID ncbi_taxonomy_id	63363
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	800

CRYSTAL STRUCTURE ANALYSIS OF LUMAZINE SYNTHASE FROM AQUIFEX AEOLICUS

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

6,7-DIMETHYL-8-RIBITYLLUMAZINE SYNTHASE

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

1hqk__assembly_1__model_1

1hqk__assembly_1__model_1 | I(q)

1hqk__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (5 domains)

CATH v4.4 (5 domains)

7. Citations (1)