6IOK | pdb_00006iok

Cryo-EM structure of multidrug efflux pump MexAB-OprM (0 degree state)

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
AMR Gene: CARD Annotation
AMR Gene Family: CARD Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth I]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
A [auth I]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
A [auth I]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
A [auth I]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
A [auth I]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
B [auth J]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
B [auth J]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
B [auth J]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
B [auth J]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
B [auth J]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
C [auth K]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
C [auth K]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
C [auth K]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
C [auth K]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
C [auth K]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
D [auth L]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
D [auth L]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
D [auth L]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
D [auth L]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
D [auth L]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
E [auth M]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
E [auth M]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
E [auth M]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
E [auth M]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
E [auth M]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
F [auth N]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
F [auth N]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
F [auth N]	SCOP2B Superfamily	HlyD C-terminal domain-like	8092210	3002572	SCOP2B (2022-06-29)
F [auth N]	SCOP2B Superfamily	HlyD beta-barrel domain-like	8041312	3002000	SCOP2B (2022-06-29)
F [auth N]	SCOP2B Superfamily	Single hybrid motif	8055550	3001880	SCOP2B (2022-06-29)
G [auth A]	SCOP2B Superfamily	Outer membrane efflux proteins (OEP)	8043654	3000246	SCOP2B (2022-06-29)
H [auth B]	SCOP2B Superfamily	Outer membrane efflux proteins (OEP)	8043654	3000246	SCOP2B (2022-06-29)
I [auth C]	SCOP2B Superfamily	Outer membrane efflux proteins (OEP)	8043654	3000246	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth I]	PRK15030_2nd	e6iokI3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
A [auth I]	HlyD_D23_C_1	e6iokI4	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
A [auth I]	PRK15030_1st	e6iokI1	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
A [auth I]	HlyD_1st	e6iokI2	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
B [auth J]	PRK15030_2nd	e6iokJ1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
B [auth J]	HlyD_D23_C_1	e6iokJ2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
B [auth J]	PRK15030_1st	e6iokJ3	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
B [auth J]	HlyD_1st	e6iokJ4	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
C [auth K]	PRK15030_2nd	e6iokK1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
C [auth K]	HlyD_D23_C_1	e6iokK3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
C [auth K]	PRK15030_1st	e6iokK4	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
C [auth K]	HlyD_1st	e6iokK2	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
D [auth L]	PRK15030_2nd	e6iokL4	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
D [auth L]	HlyD_D23_C_1	e6iokL2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
D [auth L]	PRK15030_1st	e6iokL1	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
D [auth L]	HlyD_1st	e6iokL3	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
E [auth M]	PRK15030_2nd	e6iokM1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
E [auth M]	HlyD_D23_C_1	e6iokM4	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
E [auth M]	PRK15030_1st	e6iokM3	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
E [auth M]	HlyD_1st	e6iokM2	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
F [auth N]	PRK15030_2nd	e6iokN1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: PRK15030_2nd	ECOD (1.6)
F [auth N]	HlyD_D23_C_1	e6iokN2	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: HlyD_D23_C_1	ECOD (1.6)
F [auth N]	PRK15030_1st	e6iokN3	A: alpha bundles	X: helical hairpin of HlyD-like secretion proteins (From Topology)	H: helical hairpin of HlyD-like secretion proteins (From Topology)	T: helical hairpin of HlyD-like secretion proteins	F: PRK15030_1st	ECOD (1.6)
F [auth N]	HlyD_1st	e6iokN4	A: a+b complex topology	X: alpha/beta-Hammerhead/Barrel-sandwich hybrid	H: alpha/beta-Hammerhead/Barrel-sandwich hybrid	T: Single hybrid motif	F: HlyD_1st	ECOD (1.6)
G [auth A]	OEP	e6iokA1	A: a+b duplicates or obligate multimers	X: Outer membrane efflux proteins (OEP) (From Topology)	H: Outer membrane efflux proteins (OEP) (From Topology)	T: Outer membrane efflux proteins (OEP)	F: OEP	ECOD (1.6)
H [auth B]	OEP	e6iokB1	A: a+b duplicates or obligate multimers	X: Outer membrane efflux proteins (OEP) (From Topology)	H: Outer membrane efflux proteins (OEP) (From Topology)	T: Outer membrane efflux proteins (OEP)	F: OEP	ECOD (1.6)
I [auth C]	OEP	e6iokC1	A: a+b duplicates or obligate multimers	X: Outer membrane efflux proteins (OEP) (From Topology)	H: Outer membrane efflux proteins (OEP) (From Topology)	T: Outer membrane efflux proteins (OEP)	F: OEP	ECOD (1.6)
J [auth F]	ACR_tran_4th	e6iokF4	A: alpha bundles	X: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	H: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	T: Multidrug efflux transporter AcrB transmembrane domain	F: ACR_tran_4th	ECOD (1.6)
J [auth F]	ACR_tran_1st	e6iokF3	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_1st	ECOD (1.6)
J [auth F]	ACR_tran_5th	e6iokF8	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_5th	ECOD (1.6)
J [auth F]	ACR_tran_3rd	e6iokF5	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_3rd	ECOD (1.6)
J [auth F]	ACR_tran_6th	e6iokF6	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_6th	ECOD (1.6)
J [auth F]	ACR_tran_2nd	e6iokF2	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_2nd	ECOD (1.6)
J [auth F]	ACR_tran_6th_1	e6iokF7	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_6th_1	ECOD (1.6)
K [auth G]	ACR_tran_4th	e6iokG7	A: alpha bundles	X: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	H: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	T: Multidrug efflux transporter AcrB transmembrane domain	F: ACR_tran_4th	ECOD (1.6)
K [auth G]	ACR_tran_1st	e6iokG1	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_1st	ECOD (1.6)
K [auth G]	ACR_tran_5th	e6iokG4	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_5th	ECOD (1.6)
K [auth G]	ACR_tran_3rd	e6iokG2	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_3rd	ECOD (1.6)
K [auth G]	ACR_tran_6th	e6iokG6	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_6th	ECOD (1.6)
K [auth G]	ACR_tran_2nd	e6iokG5	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_2nd	ECOD (1.6)
K [auth G]	ACR_tran_6th_1	e6iokG3	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_6th_1	ECOD (1.6)
L [auth E]	ACR_tran_4th	e6iokE6	A: alpha bundles	X: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	H: Multidrug efflux transporter AcrB transmembrane domain (From Topology)	T: Multidrug efflux transporter AcrB transmembrane domain	F: ACR_tran_4th	ECOD (1.6)
L [auth E]	ACR_tran_1st	e6iokE7	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_1st	ECOD (1.6)
L [auth E]	ACR_tran_5th	e6iokE8	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_5th	ECOD (1.6)
L [auth E]	ACR_tran_3rd	e6iokE1	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_3rd	ECOD (1.6)
L [auth E]	ACR_tran_6th	e6iokE5	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB pore domain	F: ACR_tran_6th	ECOD (1.6)
L [auth E]	ACR_tran_2nd	e6iokE4	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_2nd	ECOD (1.6)
L [auth E]	ACR_tran_6th_1	e6iokE2	A: a+b two layers	X: Alpha-beta plaits	H: Ferredoxin domains in multidrug efflux transporter	T: Multidrug efflux transporter AcrB TolC docking domain	F: ACR_tran_6th_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
G [auth A]	1.20.1600.10	Mainly Alpha	Up-down Bundle	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)
G [auth A]	2.20.200.10	Mainly Beta	Single Sheet	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)
H [auth B]	1.20.1600.10	Mainly Alpha	Up-down Bundle	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)
H [auth B]	2.20.200.10	Mainly Beta	Single Sheet	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)
I [auth C]	1.20.1600.10	Mainly Alpha	Up-down Bundle	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)
I [auth C]	2.20.200.10	Mainly Beta	Single Sheet	Outer membrane efflux proteins (OEP)	Outer membrane efflux proteins (OEP)	CATH (utative)

AMR Gene: CARD Annotation CARD Database Homepage

Chains	Accession	Short Name	Description	Provenance Source (Version)
G [auth A], H [auth B], I [auth C]	ARO:3000379	OprM	OprM is an outer membrane factor protein found in Pseudomonas aeruginosa and Burkholderia vietnamiensis. It is part of the MexAB-OprM, MexVW-OprM, MexXY-OprM and the AmrAB-OprM complex.	CARD (4.0.1)

AMR Gene Family: CARD Annotation CARD Database Homepage

Chains	Accession	Gene Family	Drug Class	Resistance Machanism	Provenance Source (Version)
G [auth A], H [auth B], I [auth C]	ARO:0010004	resistance-nodulation-cell division (RND) antibiotic efflux pump	macrolide antibiotic, fluoroquinolone antibiotic, aminoglycoside antibiotic, carbapenem, cephalosporin, penicillin beta-lactam, tetracycline antibiotic, phenicol antibiotic, disinfecting agents and antiseptics	antibiotic efflux	CARD (4.0.1)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	PF25876	RND MFP, alpha-helical hairpin domain (HH_MFP_RND)	RND MFP, alpha-helical hairpin domain	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the ...	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the outer membrane factor TolC and the resistance- nodulation-division-type efflux transporter AcrB, which is a major multidrug efflux pump in Escherichia coli [1]. The alpha -helical hairpin domain of AcrA shows conformational flexibility, which has potential mechanistic significance in coupling between AcrA conformations and TolC channel opening [1].	Domain
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	PF25917	RND MFP, barrel-sandwich hybrid domain (BSH_RND)	RND MFP, barrel-sandwich hybrid domain	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the ...	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the outer membrane factor TolC and the resistance-nodulation-division-type efflux transporter AcrB, which is a major multidrug efflux pump in Escherichia coli [1]. The barrel-sandwich hybrid domain is an important structural feature found in membrane fusion proteins. This domain plays a crucial role in the assembly and function of tripartite drug efflux systems [2]. It is involved in interactions with the other components of the RND pumps.	Domain
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	PF25967	RND MFPs, C-terminal permuted SH3 domain (RND-MFP_C)	RND MFPs, C-terminal permuted SH3 domain	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the ...	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the outer membrane factor TolC and the resistance- nodulation-division-type efflux transporter AcrB, which is a major multidrug efflux pump in Escherichia coli [1]. Another member MexA, a Pseudomonas aeruginosa homolog of AcrA, is a component of the tripartite multidrug efflux system MexAB-OprM which is a major factor for antibiotic resistance by exporting a large variety of antimicrobial compounds [2]. The domain represented by this entry folds into an open barrel with a circularly permuted topology of SH3-like barrels. This domain is involved in interactions with efflux pump membrane transporter.	Domain
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	PF25944	RND MFPs, beta-barrel domain (Beta-barrel_RND)	RND MFPs, beta-barrel domain	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the ...	This domain is found in the periplasmic membrane fusion proteins (MFPs) that are components of the RND tripartite drug efflux pumps. MFPs bridge the outer membrane factor and an inner membrane transporter. The most characterized MFP AcrA connects the outer membrane factor TolC and the resistance- nodulation-division-type efflux transporter AcrB, which is a major multidrug efflux pump in Escherichia coli [1,2]. The domain represented in this entry folds into a six-stranded closed beta-barrel with a greek-key topology which has a structural similarity to the C-terminal domain of alanine racemase. This domain is interrupted by the barrel-sandwich hybrid domain which is inserted after the first beta-strand of the barrel. This model does not include the N-terminal strand.	Domain
G [auth A], H [auth B], I [auth C]	PF02321	Outer membrane efflux protein (OEP)	Outer membrane efflux protein	-	Family
J [auth F], K [auth G], L [auth E]	PF00873	AcrB/AcrD/AcrF family (ACR_tran)	AcrB/AcrD/AcrF family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	Multidrug resistance protein MexA	efflux transmembrane transporter activity transporter activity transmembrane transporter activity identical protein binding protein binding binding	xenobiotic transport response to stimulus transport detoxification export across cell outer membrane xenobiotic detoxification by transmembrane export across the cell outer membrane establishment of localization response to toxic substance transmembrane transport localization response to chemical cellular process cellular component organization cellular component biogenesis xenobiotic transport response to stimulus transport detoxification export across cell outer membrane xenobiotic detoxification by transmembrane export across the cell outer membrane establishment of localization response to toxic substance transmembrane transport localization response to chemical cellular process cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis response to antibiotic	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex efflux pump complex transmembrane transporter complex membrane protein complex transporter complex
G [auth A], H [auth B], I [auth C]	Outer membrane protein OprM	efflux transmembrane transporter activity transporter activity transmembrane transporter activity	xenobiotic transport response to stimulus transport detoxification export across cell outer membrane xenobiotic detoxification by transmembrane export across the cell outer membrane establishment of localization response to toxic substance transmembrane transport localization response to chemical cellular process response to antibiotic	cellular anatomical structure membrane protein-containing complex efflux pump complex transmembrane transporter complex membrane protein complex transporter complex cell periphery cell outer membrane external encapsulating structure cell envelope outer membrane
J [auth F], K [auth G], L [auth E]	Multidrug resistance protein MexB	efflux transmembrane transporter activity transporter activity transmembrane transporter activity xenobiotic transmembrane transporter activity	xenobiotic transport response to stimulus transport detoxification export across cell outer membrane xenobiotic detoxification by transmembrane export across the cell outer membrane establishment of localization response to toxic substance transmembrane transport localization response to chemical cellular process response to antibiotic	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex efflux pump complex transmembrane transporter complex membrane protein complex transporter complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	IPR043602	CusB-like_dom_1	Unknown
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	IPR051160	MFP_Efflux	Unknown
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	IPR032317	CusB_D23	Unknown
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N]	IPR006143	RND efflux pump, membrane fusion protein	Family
G [auth A], H [auth B], I [auth C]	IPR050737	OMF	Unknown
G [auth A], H [auth B], I [auth C]	IPR003423	Outer membrane efflux protein	Family
G [auth A], H [auth B], I [auth C]	IPR010131	Multidrug resistance outer membrane protein MdtP/Nodulation protein T-like	Family
J [auth F], K [auth G], L [auth E]	IPR001036	Acriflavin resistance protein	Family
J [auth F], K [auth G], L [auth E]	IPR004764	Multidrug resistance protein MdtF-like	Family
J [auth F], K [auth G], L [auth E]	IPR027463	Multidrug efflux transporter AcrB TolC docking domain, DN/DC subdomains	Homologous Superfamily

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M] A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N], G [auth A], H [auth B], I [auth C], J [auth F], K [auth G], L [auth E]	OPM	Transmembrane	Alpha-helical polytopic	Resistance-nodulation-cell division	Hydrophobe/amphiphile efflux-1 family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M] A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N], G [auth A], H [auth B], I [auth C], J [auth F], K [auth G], L [auth E]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth I], B [auth J], C [auth K], D [auth L], E [auth M] A [auth I], B [auth J], C [auth K], D [auth L], E [auth M], F [auth N], G [auth A], H [auth B], I [auth C], J [auth F], K [auth G], L [auth E]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Multi-Drug Efflux Transporters	MexAB-OprM tripartite efflux pump, 0 degree state