SAXSdb — 1q6a

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

Circadian clock protein KaiA homolog

Thermosynechococcus elongatus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8RR35
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–107； UniProt 180–283 Author chain B； PDBConstruct 4–107； UniProt 180–283

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	1q6a
Deposition date deposition_date	2003-08-13
Structure title title	Solution Structure of the C-terminal Domain of Thermosynechococcus elongatus KaiA (ThKaiA180C); Averaged Minimized Structure
Keywords keywords	All alpha-helix protein, Homodimer, Circadian Clock Protein; CIRCADIAN CLOCK PROTEIN
Experimental Method method	SOLUTION NMR

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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.

1q6a__assembly_1__model_1

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

Download this curve (.dat)

1q6a__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1q6a__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.63 Å
Rg (electron density)	19.36 Å
Total Rg	20.51 Å
Atom count	3576
Residues	214
Excluded volume	31763 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1q6a__assembly_1__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 (1)

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1q6aa1
Class class	a — All alpha proteins
Fold Fold fold	a.186 — KaiA/RbsU domain
Superfamily Superfamily superfamily	a.186.1 — KaiA/RbsU domain
Family Family family	a.186.1.1 — Circadian clock protein KaiA, C-terminal domain

Domain ID domain_id	d1q6aa2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1q6ab1
Class class	a — All alpha proteins
Fold Fold fold	a.186 — KaiA/RbsU domain
Superfamily Superfamily superfamily	a.186.1 — KaiA/RbsU domain
Family Family family	a.186.1.1 — Circadian clock protein KaiA, C-terminal domain

Domain ID domain_id	d1q6ab2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (2 domains)

Domain ID domain_id	1q6aA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1240 — Methyltransferase, Methionine Synthase (B12-binding Domains); Chain A, domain 1
Homologous superfamily homologous superfamily	30 — KaiA/RbsU domain

Domain ID domain_id	1q6aB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1240 — Methyltransferase, Methionine Synthase (B12-binding Domains); Chain A, domain 1
Homologous superfamily homologous superfamily	30 — KaiA/RbsU domain

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Description description	Circadian clock protein KaiA homolog
Molecular weight formula_weight	12601.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3576

Source organism organism	Thermosynechococcus elongatus
NCBI taxonomy ID ncbi_taxonomy_id	197221
Host organism host_organism	Escherichia coli BL21(DE3)

Solution Structure of the C-terminal Domain of Thermosynechococcus elongatus KaiA (ThKaiA180C); Averaged Minimized Structure

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

Circadian clock protein KaiA homolog

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

1q6a__assembly_1__model_1

1q6a__assembly_1__model_1 | I(q)

1q6a__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Solution Structure of the C-terminal Domain of Thermosynechococcus elongatus KaiA (ThKaiA180C); Averaged Minimized Structure

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

Circadian clock protein KaiA homolog

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

1q6a__assembly_1__model_1

1q6a__assembly_1__model_1 | I(q)

1q6a__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (4 domains)

CATH v4.4 (2 domains)

7. Citations (1)