2fed

Structure of the E203Q mutant of the Cl-/H+ exchanger CLC-ec1 from E.Coli

Method: X-RAY DIFFRACTION

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

H(+)/Cl(-) exchange transporter clcA

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 6	Fab fragment, heavy chain × 2 Fab fragment, light chain × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CLCA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–465； UniProt 1–465 Author chain B； PDBConstruct 1–465； UniProt 1–465

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	2fed
Deposition date deposition_date	2005-12-15
Structure title title	Structure of the E203Q mutant of the Cl-/H+ exchanger CLC-ec1 from E.Coli
Keywords keywords	CLC-ec1; CLCA_ECOLI; Chloride/Proton exchange transporter, PROTON TRANSPORT, MEMBRANE PROTEIN; PROTON TRANSPORT,MEMBRANE PROTEIN
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.

2fed__assembly_1__model_1

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

Download this curve (.dat)

2fed__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2fed__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	43.07 Å
Rg (electron density)	42.30 Å
Total Rg	42.65 Å
Atom count	13223
Residues	1749
Excluded volume	238290 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2fed__assembly_1__model_1`	hexameric （6）	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	H(+)/Cl(-) exchange transporter clcA
Molecular weight formula_weight	49657.7 kDa
Mutation mutation	E203Q
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	13223

MKTDTPSLETPQAARLRRRQLIRQLLERDKTPLAILFMAAVVGTLVGLAAVAFDKGVAWLQNQRMGALVHTADNYPLLLTVAFLCSAVLAMFGYFLVRKYAPEAGGSGIPEIEGALEDQRPVRWWRVLPVKFFGGLGTLGGGMVLGREGPTVQIGGNIGRMVLDIFRLKGDEARHTLLATGAAAGLAAAFNAPLAGILFIIEQMRPQFRYTLISIKAVFIGVIMSTIMYRIFNHEVALIDVGKLSDAPLNTLWLYLILGIIFGIFGPIFNKWVLGMQDLLHRVHGGNITKWVLMGGAIGGLCGLLGFVAPATSGGGFNLIPIATAGNFSMGMLVFIFVARVITTLLCFSSGAPGGIFAPMLALGTVLGTAFGMVAVELFPQYHLEAGTFAIAGMGALLAASIRAPLTGIILVLEMTDNYQLILPMIITGLGATLLAQFTGGKPLYSAILARTLAKQEAEQLARSK

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 polymer

Description description	Fab fragment, heavy chain
Molecular weight formula_weight	23823.0 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

EVRLLESGGGLVQPGGSLKLSCAASGFDYSRYWMSWVRQAPGKGLKWIGEINPVSSTINYTPSLKDKFIISRDNAKDTLYLQISKVRSEDTALYYCARLYYGYGYWYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAAAASMVTLGCLVKGYFPEPVTVTWNSGSLAAGVHTFPAVLQAALYTLSSSVTVPSSSWPSETVTCNVAHPASSTKVDKKIVPRA

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Mus musculus

Entity 3 Entity 3 polymer

Description description	Fab fragment, light chain
Molecular weight formula_weight	23088.4 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

DIVLTQSPAIMSAAPGDKVTMTCSASSSVSYIHWYQQKSGTSPKRWIYDTSKLTSGVPVRFSGSGSGTSYSLTINTMEAEDAATYYCQQWSSHPQTFGGGTKLEILRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRA

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Mus musculus

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6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d2feda1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.20 — Clc chloride channel
Superfamily Superfamily superfamily	f.20.1 — Clc chloride channel
Family Family family	f.20.1.1 — Clc chloride channel

Domain ID domain_id	d2fedb1
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.20 — Clc chloride channel
Superfamily Superfamily superfamily	f.20.1 — Clc chloride channel
Family Family family	f.20.1.1 — Clc chloride channel

Domain ID domain_id	d2fedd1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.1 — V set domains (antibody variable domain-like)

Domain ID domain_id	d2fedd2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d2fedf1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.1 — V set domains (antibody variable domain-like)

Domain ID domain_id	d2fedf2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

CATH v4.4 (10 domains)

Domain ID domain_id	2fedA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3080 — Clc chloride channel
Homologous superfamily homologous superfamily	10 — Clc chloride channel

Domain ID domain_id	2fedB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3080 — Clc chloride channel
Homologous superfamily homologous superfamily	10 — Clc chloride channel

Domain ID domain_id	2fedC01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedC02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedD01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedD02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedE01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedE02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedF01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	2fedF02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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Unit-cell length a length_a	232.274 Å
Unit-cell length b length_b	98.226 Å
Unit-cell length c length_c	170.364 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	131.73 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	3.317 Å
Low-resolution limit resolution_low	49.810 Å
R factor r_factor	0.2498
R_work r_work	0.2478
R_free r_free	0.2866

Structure of the E203Q mutant of the Cl-/H+ exchanger CLC-ec1 from E.Coli

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

H(+)/Cl(-) exchange transporter clcA

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

2fed__assembly_1__model_1

2fed__assembly_1__model_1 | I(q)

2fed__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 (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

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (6 domains)

CATH v4.4 (10 domains)

7. Citations (2)

Structure of the E203Q mutant of the Cl-/H+ exchanger CLC-ec1 from E.Coli

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

H(+)/Cl(-) exchange transporter clcA

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

2fed__assembly_1__model_1

2fed__assembly_1__model_1 | I(q)

2fed__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 (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

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (6 domains)

CATH v4.4 (10 domains)

7. Citations (2)