SAXSdb — 6s1k

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

Chemotaxis protein CheA

Escherichia coli str. K-12 substr. MG1655star

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	CheW × 2 Methyl-accepting chemotaxis protein I × 12 （P02942）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CHEA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–654； UniProt 1–654 Author chain B； PDBConstruct 1–654； UniProt 1–654

Methyl-accepting chemotaxis protein I

Escherichia coli str. K-12 substr. MG1655star

UniProt P02942

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 16	Chemotaxis protein CheA × 2 （P07363） CheW × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MCP1_ECOLI
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain E； PDBConstruct 1–551； UniProt 1–551 Author chain F； PDBConstruct 1–551； UniProt 1–551 Author chain G； PDBConstruct 1–551； UniProt 1–551 Author chain H； PDBConstruct 1–551； UniProt 1–551 Author chain I； PDBConstruct 1–551； UniProt 1–551 Author chain J； PDBConstruct 1–551； UniProt 1–551 Author chain K； PDBConstruct 1–551； UniProt 1–551 Author chain L； PDBConstruct 1–551； UniProt 1–551 Author chain M； PDBConstruct 1–551； UniProt 1–551 Author chain N； PDBConstruct 1–551； UniProt 1–551 Author chain O； PDBConstruct 1–551； UniProt 1–551 Author chain P； PDBConstruct 1–551； UniProt 1–551

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	6s1k
Deposition date deposition_date	2019-06-18
Structure title title	E. coli Core Signaling Unit, carrying QQQQ receptor mutation
Keywords keywords	chemotaxis, methyl-accepting chemotaxis protein, histidine kinase, SIGNALING PROTEIN; SIGNALING PROTEIN
Experimental Method method	ELECTRON MICROSCOPY

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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.

6s1k__assembly_1__model_1

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

Download this curve (.dat)

6s1k__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6s1k__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	47.95 Å
Rg (electron density)	47.15 Å
Total Rg	47.42 Å
Atom count	16884
Residues	2280
Excluded volume	300700 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6s1k__assembly_1__model_1`	hexadecameric （16）	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	Chemotaxis protein CheA
Molecular weight formula_weight	71454.2 kDa
EC 编号 ec_number	2.7.13.3
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	16884

MSMDISDFYQTFFDEADELLADMEQHLLVLQPEAPDAEQLNAIFRAAHSIKGGAGTFGFSVLQETTHLMENLLDEARRGEMQLNTDIINLFLETKDIMQEQLDAYKQSQEPDAASFDYICQALRQLALEAKGETPSAVTRLSVVAKSEPQDEQSRSQSPRRIILSRLKAGEVDLLEEELGHLTTLTDVVKGADSLSAILPGDIAEDDITAVLCFVIEADQITFETVEVSPKISTPPVLKLAAEQAPTGRVEREKTTRSNESTSIRVAVEKVDQLINLVGELVITQSMLAQRSSELDPVNHGDLITSMGQLQRNARDLQESVMSIRMMPMEYVFSRYPRLVRDLAGKLGKQVELTLVGSSTELDKSLIERIIDPLTHLVRNSLDHGIELPEKRLAAGKNSVGNLILSAEHQGGNICIEVTDDGAGLNRERILAKAASQGLTVSENMSDDEVAMLIFAPGFSTAEQVTDVSGRGVGMDVVKRNIQKMGGHVEIQSKQGTGTTIRILLPLTLAILDGMSVRVADEVFILPLNAVMESLQPREADLHPLAGGERVLEVRGEYLPIVELWKVFNVAGAKTEATQGIVVILQSGGRRYALLVDQLIGQHQVVVKNLESNYRKVPGISAATILGDGSVALIVDVSALQAINREQRMANTAA

Source Source

Source organism organism	Escherichia coli str. K-12 substr. MG1655star
NCBI taxonomy ID ncbi_taxonomy_id	879462
Host organism host_organism	Escherichia coli str. K-12 substr. MG1655star

Entity 2 Entity 2 polymer

Description description	CheW
Molecular weight formula_weight	18095.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,D

MTGMTNVTKLASEPSGQEFLVFTLGDEEYGIDILKVQEIRGYDQVTRIANTPAFIKGVTNLRGVIVPIVDLRIKFSQVDVDYNDNTVVIVLNLGQRVVGIVVDGVSDVLSLTAEQIRPAPEFAVTLSTEYLTGLGALGDRMLILVNIEKLLNSEEMALLDSAASEVA

Source Source

Source organism organism	Escherichia coli str. K-12 substr. MG1655star
NCBI taxonomy ID ncbi_taxonomy_id	879462
Host organism host_organism	Escherichia coli str. K-12 substr. MG1655star

Entity 3 Entity 3 polymer

Description description	Methyl-accepting chemotaxis protein I
Molecular weight formula_weight	59495.8 kDa
Source method src_method	man
Copy count entity_count	12

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,F,G,H,I,J,K,L,M,N,O,P

MLKRIKIVTSLLLVLAVFGLLQLTSGGLFFNALKNDKENFTVLQTIRQQQSTLNGSWVALLQTRNTLNRAGIRYMMDQNNIGSGSTVAELMESASISLKQAEKNWADYEALPRDPRQSTAAAAEIKRNYDIYHNALAELIQLLGAGKINEFFDQPTQGYQDGFEKQYVAYMEQNDRLHDIAVSDNNASYSQAMWILVGVMIVVLAVIFAVWFGIKASLVAPMNRLIDSIRHIAGGDLVKPIEVDGSNEMGQLAESLRHMQGELMRTVGDVRNGANAIYSGASEIATGNNDLSSRTEQQAASLEETAASMEQLTATVKQNAENARQASHLALSASETAQRGGKVVDNVVQTMRDISTSSQKIADIISVIDGIAFQTNILALNAAVEAARAGEQGRGFAVVAGEVRNLAQRSAQAAREIKSLIEDSVGKVDVGSTLVESAGETMAEIVSAVTRVTDIMGEIASASDEQSRGIDQVGLAVAEMDRVTQQNAALVEESAAAAAALEEQASRLTEAVAVFRIQQQQRETSAVVKTVTPAAPRKMAVADSEENWETF

Source Source

Source organism organism	Escherichia coli str. K-12 substr. MG1655star
NCBI taxonomy ID ncbi_taxonomy_id	879462
Host organism host_organism	Escherichia coli str. K-12 substr. MG1655star

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	1

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

Resolution resolution	8.38 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	91636

E. coli Core Signaling Unit, carrying QQQQ receptor mutation

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

Chemotaxis protein CheA

State in the Current Structure

Other States of the Same Protein in the Database

Methyl-accepting chemotaxis protein I

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

6s1k__assembly_1__model_1

6s1k__assembly_1__model_1 | I(q)

6s1k__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

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 polymer

Polymer Polymer

Source Source

7. Citations (1)

E. coli Core Signaling Unit, carrying QQQQ receptor mutation

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

Chemotaxis protein CheA

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Methyl-accepting chemotaxis protein I

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

6s1k__assembly_1__model_1

6s1k__assembly_1__model_1 | I(q)

6s1k__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

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 polymer

Polymer Polymer

Source Source

7. Citations (1)