SAXSdb — 6x61

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

Circadian clock protein kinase KaiC

Thermosynechococcus elongatus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count
4	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count
5	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count
6	Protein heterocomplex	Heteromer	Protein 2	Adaptive-response sensory-kinase SasA × 1 （Q8DMT2） PHOSPHATE ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KAIC_THEEB
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 9–239； UniProt 17–247 Author chain C； PDBConstruct 9–239； UniProt 17–247 Author chain E； PDBConstruct 9–239； UniProt 17–247 Author chain G； PDBConstruct 9–239； UniProt 17–247 Author chain I； PDBConstruct 9–239； UniProt 17–247 Author chain K； PDBConstruct 9–239； UniProt 17–247

Adaptive-response sensory-kinase SasA

Thermosynechococcus elongatus

UniProt Q8DMT2

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count
4	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count
5	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count
6	Protein heterocomplex	Heteromer	Protein 2	Circadian clock protein kinase KaiC × 1 （Q79V60） PHOSPHATE ION × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SASA_THEEB
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 9–100； UniProt 16–107 Author chain D； PDBConstruct 9–100； UniProt 16–107 Author chain F； PDBConstruct 9–100； UniProt 16–107 Author chain H； PDBConstruct 9–100； UniProt 16–107 Author chain J； PDBConstruct 9–100； UniProt 16–107 Author chain L； PDBConstruct 9–100； UniProt 16–107

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	6x61
Deposition date deposition_date	2020-05-27
Structure title title	Crystal structure of the N-terminal thioredoxin domain of SasA in complex with the N-terminal CI domain of KaiC from Thermosynchococcus elongatus
Keywords keywords	Transcription regulator, complex, circadian clock, TRANSCRIPTION, TRANSCRIPTION-TRANSFERASE complex; TRANSCRIPTION/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.

6x61__assembly_4__model_1

Assembly 4 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

6x61__assembly_4__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6x61__assembly_4__model_1 | P(r) · Pending

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

Rg（Guinier）	22.92 Å
Rg (electron density)	21.97 Å
Total Rg	22.73 Å
Atom count	2597
Residues	325
Excluded volume	46493 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6x61__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`6x61__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`6x61__assembly_3__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`6x61__assembly_4__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`6x61__assembly_5__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`6x61__assembly_6__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 (3)

Entity 1 Entity 1 polymer

Description description	Circadian clock protein kinase KaiC
Molecular weight formula_weight	27738.2 kDa
EC 编号 ec_number	2.7.11.1
Mutation mutation	R41A, K173A
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C,E,G,I,K
Atom count atom_count	15499

DYKDDDDKAEVKKIPTMIEGFDDISHGGLPQGATTLVSGTSGTGKTLFAVQFLYNGITIFNEPGIFVTFEESPQDIIKNALSFGWNLQSLIDQGKLFILDASPDPDGQEVAGDFDLSALIERIQYAIRKYKATRVSIDSVTAVFQQYDAASVVRREIFRLAFRLAQLGVTTIMTTERVDEYGPVARFGVEEFVSDNVVILRNVLEGERRRRTVEILKLRGTTHMKGEYPFTINNGINIFDYKDDDDK

Source Source

Source organism organism	Thermosynechococcus elongatus
NCBI taxonomy ID ncbi_taxonomy_id	197221
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Adaptive-response sensory-kinase SasA
Molecular weight formula_weight	12629.2 kDa
EC 编号 ec_number	2.7.13.3
Mutation mutation	P16A
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,D,F,H,J,L

DYKDDDDKALSLLLFVANRPGDEEETAAIQAHIQQLPSNFSFELKVVPIGEQPYLLEEYKLVATPALIKVRPEPRQTLAGRKLLQKVDYWWPRWQREVALDYKDDDDK

Source Source

Source organism organism	Thermosynechococcus elongatus
NCBI taxonomy ID ncbi_taxonomy_id	197221
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 non-polymer

Description description	PHOSPHATE ION
Molecular weight formula_weight	95.0 kDa
Source method src_method	syn
Copy count entity_count	6

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Unit-cell length a length_a	107.600 Å
Unit-cell length b length_b	121.580 Å
Unit-cell length c length_c	133.590 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	108.78 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	3.200 Å
Low-resolution limit resolution_low	49.049 Å
R factor r_factor	0.2239
R_work r_work	0.2217
R_free r_free	0.2653

Crystal structure of the N-terminal thioredoxin domain of SasA in complex with the N-terminal CI domain of KaiC from Thermosynchococcus elongatus

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

Circadian clock protein kinase KaiC

State in the Current Structure

Other States of the Same Protein in the Database

Adaptive-response sensory-kinase SasA

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

6x61__assembly_4__model_1

6x61__assembly_4__model_1 | I(q)

6x61__assembly_4__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

7. Citations (1)

Crystal structure of the N-terminal thioredoxin domain of SasA in complex with the N-terminal CI domain of KaiC from Thermosynchococcus elongatus

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

Circadian clock protein kinase KaiC

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Adaptive-response sensory-kinase SasA

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

6x61__assembly_4__model_1

6x61__assembly_4__model_1 | I(q)

6x61__assembly_4__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

7. Citations (1)