2v50

The Missing Part of the Bacterial MexAB-OprM System: Structural determination of the Multidrug Exporter MexB

Method: X-RAY DIFFRACTION

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

MULTIDRUG RESISTANCE PROTEIN MEXB

PSEUDOMONAS AERUGINOSA PA01

UniProt P52002

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	DODECYL-BETA-D-MALTOSIDE × 4	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 3	DODECYL-BETA-D-MALTOSIDE × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MEXB_PSEAE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–1046； UniProt 1–1046 Author chain B； PDBConstruct 1–1046； UniProt 1–1046 Author chain C； PDBConstruct 1–1046； UniProt 1–1046 Author chain D； PDBConstruct 1–1046； UniProt 1–1046 Author chain E； PDBConstruct 1–1046； UniProt 1–1046 Author chain F； PDBConstruct 1–1046； UniProt 1–1046

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	2v50
Deposition date deposition_date	2008-10-01
Structure title title	The Missing Part of the Bacterial MexAB-OprM System: Structural determination of the Multidrug Exporter MexB
Keywords keywords	;MULTIDRUG RESISTANCE PROTEIN, DDM, RND, MEMBRANE, DETERGENT, TRANSPORT, CELL MEMBRANE, TRANSMEMBRANE, MEMBRANE PROTEIN, CELL INNER MEMBRANE, ANTIBIOTIC RESISTANCE, DRUG-EFFLUX PUMP, TRANSPORT PROTEIN ;; 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.

2v50__assembly_1__model_1

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

Download this curve (.dat)

2v50__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2v50__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	45.47 Å
Rg (electron density)	44.78 Å
Total Rg	45.10 Å
Atom count	23398
Residues	3065
Excluded volume	422620 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2v50__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2v50__assembly_2__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	MULTIDRUG RESISTANCE PROTEIN MEXB
Molecular weight formula_weight	113706.0 kDa
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	46628

MSKFFIDRPIFAWVIALVIMLAGGLSILSLPVNQYPAIAPPAIAVQVSYPGASAETVQDTVVQVIEQQMNGIDNLRYISSESNSDGSMTITVTFEQGTDPDIAQVQVQNKLQLATPLLPQEVQRQGIRVTKAVKNFLMVVGVVSTDGSMTKEDLSNYIVSNIQDPLSRTKGVGDFQVFGSQYSMRIWLDPAKLNSYQLTPGDVSSAIQAQNVQISSGQLGGLPAVKGQQLNATIIGKTRLQTAEQFENILLKVNPDGSQVRLKDVADVGLGGQDYSINAQFNGSPASGIAIKLATGANALDTAKAIRQTIANLEPFMPQGMKVVYPYDTTPVVSASIHEVVKTLGEAILLVFLVMYLFLQNFRATLIPTIAVPVVLLGTFGVLAAFGFSINTLTMFGMVLAIGLLVDDAIVVVENVERVMAEEGLSPREAARKSMGQIQGALVGIAMVLSAVFLPMAFFGGSTGVIYRQFSITIVSAMALSVIVALILTPALCATMLKPIEKGDHGEHKGGFFGWFNRMFLSTTHGYERGVASILKHRAPYLLIYVVIVAGMIWMFTRIPTAFLPDEDQGVLFAQVQTPPGSSAERTQVVVDSMREYLLEKESSSVSSVFTVTGFNFAGRGQSSGMAFIMLKPWEERPGGENSVFELAKRAQMHFFSFKDAMVFAFAPPSVLELGNATGFDLFLQDQAGVGHEVLLQARNKFLMLAAQNPALQRVRPNGMSDEPQYKLEIDDEKASALGVSLADINSTVSIAWGSSYVNDFIDRGRVKRVYLQGRPDARMNPDDLSKWYVRNDKGEMVPFNAFATGKWEYGSPKLERYNGVPAMEILGEPAPGLSSGDAMAAVEEIVKQLPKGVGYSWTGLSYEERLSGSQAPALYALSLLVVFLCLAALYESWSIPFSVMLVVPLGVIGALLATSMRGLSNDVFFQVGLLTTIGLSAKNAILIVEFAKELHEQGKGIVEAAIEACRMRLRPIVMTSLAFILGVVPLAISTGAGSGSQHAIGTGVIGGMVTATVLAIFWVPLFYVAVSTLFKDEASKQQASVEKGQHHHHHH

Source Source

Source organism organism	PSEUDOMONAS AERUGINOSA PA01
NCBI taxonomy ID ncbi_taxonomy_id	208964
Host organism host_organism	ESCHERICHIA COLI BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	DODECYL-BETA-D-MALTOSIDE
Molecular weight formula_weight	510.6 kDa
Source method src_method	syn
Copy count entity_count	8

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6. Fold Classification (SCOP + CATH) 48 domains

CATH v4.4 (48 domains)

Domain ID domain_id	2v50A01
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	2v50A02
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	2v50A03
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	2v50A04
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	2v50A05
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	2v50A06
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	2v50A07
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	2v50A08
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	2v50B01
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	2v50B02
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	2v50B03
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	2v50B04
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	2v50B05
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	2v50B06
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	2v50B07
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	2v50B08
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	2v50C01
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	2v50C02
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	2v50C03
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	2v50C04
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	2v50C05
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	2v50C06
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	2v50C07
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	2v50C08
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	2v50D01
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	2v50D02
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	2v50D03
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	2v50D04
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	2v50D05
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	2v50D06
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	2v50D07
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	2v50D08
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	2v50E01
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	2v50E02
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	2v50E03
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	2v50E04
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	2v50E05
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	2v50E06
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	2v50E07
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	2v50E08
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	2v50F01
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	2v50F02
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	2v50F03
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	2v50F04
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	2v50F05
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	2v50F06
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	2v50F07
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	2v50F08
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	125.050 Å
Unit-cell length b length_b	134.580 Å
Unit-cell length c length_c	151.020 Å
Unit-cell angle α angle_alpha	86.99 °
Unit-cell angle β angle_beta	69.70 °
Unit-cell angle γ angle_gamma	88.16 °
Molecules per unit cell Z z_pdb	6

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

Resolution resolution	3.000 Å
Low-resolution limit resolution_low	49.760 Å
R factor r_factor	0.2430
R_work r_work	0.2420
R_free r_free	0.2870

The Missing Part of the Bacterial MexAB-OprM System: Structural determination of the Multidrug Exporter MexB

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

MULTIDRUG RESISTANCE PROTEIN MEXB

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

2v50__assembly_1__model_1

2v50__assembly_1__model_1 | I(q)

2v50__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) 48 domains

CATH v4.4 (48 domains)

7. Citations (1)

The Missing Part of the Bacterial MexAB-OprM System: Structural determination of the Multidrug Exporter MexB

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

MULTIDRUG RESISTANCE PROTEIN MEXB

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

2v50__assembly_1__model_1

2v50__assembly_1__model_1 | I(q)

2v50__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) 48 domains

CATH v4.4 (48 domains)

7. Citations (1)