2drd

Crystal structure of a multidrug transporter reveal a functionally rotating mechanism

Method: X-RAY DIFFRACTION

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

ACRB

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	(4S,4AS,5AR,12AS)-4,7-BIS(DIMETHYLAMINO)-3,10,12,12A-TETRAHYDROXY-1,11-DIOXO-1,4,4A,5,5A,6,11,12A-OCTAHYDROTETRACENE-2- CARBOXAMIDE × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	ACRB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–1049； UniProt 1–1049 Author chain B； PDBConstruct 1–1049； UniProt 1–1049 Author chain C； PDBConstruct 1–1049； UniProt 1–1049

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	2drd
Deposition date deposition_date	2006-06-08
Structure title title	Crystal structure of a multidrug transporter reveal a functionally rotating mechanism
Keywords keywords	membrane transporter, membrane protein, multidrug efflux, drug resistance, transporter, exporter, antiporter; 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.

2drd__assembly_1__model_1

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

Download this curve (.dat)

2drd__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2drd__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	45.45 Å
Rg (electron density)	44.88 Å
Total Rg	45.21 Å
Atom count	23355
Residues	3066
Excluded volume	422080 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2drd__assembly_1__model_1`	trimeric （3）	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)

Entity 1 Entity 1 polymer

Description description	ACRB
Molecular weight formula_weight	114217.7 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	23355

MPNFFIDRPIFAWVIAIIIMLAGGLAILKLPVAQYPTIAPPAVTISASYPGADAKTVQDTVTQVIEQNMNGIDNLMYMSSNSDSTGTVQITLTFESGTDADIAQVQVQNKLQLAMPLLPQEVQQQGVSVEKSSSSFLMVVGVINTDGTMTQEDISDYVAANMKDAISRTSGVGDVQLFGSQYAMRIWMNPNELNKFQLTPVDVITAIKAQNAQVAAGQLGGTPPVKGQQLNASIIAQTRLTSTEEFGKILLKVNQDGSRVLLRDVAKIELGGENYDIIAEFNGQPASGLGIKLATGANALDTAAAIRAELAKMEPFFPSGLKIVYPYDTTPFVKISIHEVVKTLVEAIILVFLVMYLFLQNFRATLIPTIAVPVVLLGTFAVLAAFGFSINTLTMFGMVLAIGLLVDDAIVVVENVERVMAEEGLPPKEATRKSMGQIQGALVGIAMVLSAVFVPMAFFGGSTGAIYRQFSITIVSAMALSVLVALILTPALCATMLKPIAKGDHGEGKKGFFGWFNRMFEKSTHHYTDSVGGILRSTGRYLVLYLIIVVGMAYLFVRLPSSFLPDEDQGVFMTMVQLPAGATQERTQKVLNEVTHYYLTKEKNNVESVFAVNGFGFAGRGQNTGIAFVSLKDWADRPGEENKVEAITMRATRAFSQIKDAMVFAFNLPAIVELGTATGFDFELIDQAGLGHEKLTQARNQLLAEAAKHPDMLTSVRPNGLEDTPQFKIDIDQEKAQALGVSINDINTTLGAAWGGSYVNDFIDRGRVKKVYVMSEAKYRMLPDDIGDWYVRAADGQMVPFSAFSSSRWEYGSPRLERYNGLPSMEILGQAAPGKSTGEAMELMEQLASKLPTGVGYDWTGMSYQERLSGNQAPSLYAISLIVVFLCLAALYESWSIPFSVMLVVPLGVIGALLAATFRGLTNDVYFQVGLLTTIGLSAKNAILIVEFAKDLMDKEGKGLIEATLDAVRMRLRPILMTSLAFILGVMPLVISTGAGSGAQNAVGTGVMGGMVTATVLAIFFVPVFFVVVRRRFSRKNEDIEHSHTVDHHHHHH

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli K12

Entity 2 Entity 2 non-polymer

Description description	(4S,4AS,5AR,12AS)-4,7-BIS(DIMETHYLAMINO)-3,10,12,12A-TETRAHYDROXY-1,11-DIOXO-1,4,4A,5,5A,6,11,12A-OCTAHYDROTETRACENE-2- CARBOXAMIDE
Molecular weight formula_weight	457.5 kDa
Source method src_method	syn
Copy count entity_count	1

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6. Fold Classification (SCOP + CATH) 24 domains

CATH v4.4 (24 domains)

Domain ID domain_id	2drdA01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdA03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1320 — Multidrug efflux transporter AcrB pore domain like

Domain ID domain_id	2drdA04
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

Domain ID domain_id	2drdA05
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdA06
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdA07
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1440 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdA08
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

Domain ID domain_id	2drdB01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdB03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1320 — Multidrug efflux transporter AcrB pore domain like

Domain ID domain_id	2drdB04
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

Domain ID domain_id	2drdB05
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdB06
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdB07
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1440 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdB08
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

Domain ID domain_id	2drdC01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdC02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdC03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1320 — Multidrug efflux transporter AcrB pore domain like

Domain ID domain_id	2drdC04
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

Domain ID domain_id	2drdC05
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1640 — Multidrug efflux transporter AcrB transmembrane fold
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB transmembrane domain

Domain ID domain_id	2drdC06
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1430 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdC07
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1440 — Multidrug efflux transporter AcrB pore domain

Domain ID domain_id	2drdC08
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2090 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains
Homologous superfamily homologous superfamily	10 — Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains

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Unit-cell length a length_a	225.801 Å
Unit-cell length b length_b	134.466 Å
Unit-cell length c length_c	162.115 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	98.17 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

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

Resolution resolution	3.100 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2570
R_work r_work	0.2550
R_free r_free	0.3100

Crystal structure of a multidrug transporter reveal a functionally rotating mechanism

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

ACRB

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

2drd__assembly_1__model_1

2drd__assembly_1__model_1 | I(q)

2drd__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 non-polymer

6. Fold Classification (SCOP + CATH) 24 domains

CATH v4.4 (24 domains)

7. Citations (1)

Crystal structure of a multidrug transporter reveal a functionally rotating mechanism

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

ACRB

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

2drd__assembly_1__model_1

2drd__assembly_1__model_1 | I(q)

2drd__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 non-polymer

6. Fold Classification (SCOP + CATH) 24 domains

CATH v4.4 (24 domains)

7. Citations (1)