mexB encodes the inner-membrane transporter subunit of an RND (resistance-nodulation-cell division) family multidrug efflux pump. It is a large multi-pass integral membrane protein of the cytoplasmic (inner) membrane that uses the transmembrane proton-motive force as an antiporter to capture substrates from the periplasm and outer leaflet of the inner membrane and pump them outward. Acting together with a periplasmic membrane-fusion (adaptor) protein and an outer-membrane channel, it forms a tripartite efflux system that expels a broad range of structurally diverse antibiotics, solvents, dyes and other xenobiotics across the cell envelope, contributing to intrinsic multidrug and solvent resistance in P. putida.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
|
GO:0005886
plasma membrane
|
IEA
GO_REF:0000120 |
ACCEPT |
Summary: Correct cellular component. The RND transporter subunit is a multi-pass integral protein of the bacterial plasma (inner) membrane (UniProt SUBCELLULAR LOCATION; multi-pass membrane protein). Accept as the informative localization.
|
|
GO:0015562
efflux transmembrane transporter activity
|
IEA
GO_REF:0000002 |
ACCEPT |
Summary: Core molecular function. MexB-type RND proteins are the energized efflux transporter subunit that exports substrates outward across the membrane. Matches the UniProt "Efflux pump membrane transporter" name and RND family assignment. Accept.
|
|
GO:0016020
membrane
|
IEA
GO_REF:0000002 |
KEEP AS NON CORE |
Summary: Correct but general. "Membrane" is a broad parent of the plasma membrane localization already annotated. Keep as non-core in favor of the more specific GO:0005886.
|
|
GO:0022857
transmembrane transporter activity
|
IEA
GO_REF:0000002 |
KEEP AS NON CORE |
Summary: Correct but general parent of the efflux transporter activity. Keep as non-core in favor of the more specific efflux/xenobiotic transporter terms.
|
|
GO:0042908
xenobiotic transport
|
IEA
GO_REF:0000002 |
ACCEPT |
Summary: Core biological process. The pump exports structurally diverse xenobiotics (antibiotics, solvents, dyes) out of the cell. Accept as a defining biological role.
|
|
GO:0042910
xenobiotic transmembrane transporter activity
|
IEA
GO_REF:0000118 |
ACCEPT |
Summary: Core molecular function describing the substrate range. The transporter moves xenobiotics across the membrane; together with the efflux directionality term (GO:0015562) this captures the activity. Accept.
|
|
GO:0055085
transmembrane transport
|
IEA
GO_REF:0000002 |
KEEP AS NON CORE |
Summary: Correct but general parent process of xenobiotic transport. Keep as non-core in favor of the more specific GO:0042908.
|
This report is retrieval-only and is generated directly from Asta results.
search_papers_by_relevance with snippet_search.id: Q88HA4
gene_symbol: mexB
product_type: PROTEIN
status: DRAFT
taxon:
id: NCBITaxon:160488
label: Pseudomonas putida (strain ATCC 47054 / DSM 6125 / CFBP 8728 / NCIMB 11950
/ KT2440)
description: >-
mexB encodes the inner-membrane transporter subunit of an RND
(resistance-nodulation-cell division) family multidrug efflux pump. It is a
large multi-pass integral membrane protein of the cytoplasmic (inner) membrane
that uses the transmembrane proton-motive force as an antiporter to capture
substrates from the periplasm and outer leaflet of the inner membrane and pump
them outward. Acting together with a periplasmic membrane-fusion (adaptor)
protein and an outer-membrane channel, it forms a tripartite efflux system that
expels a broad range of structurally diverse antibiotics, solvents, dyes and
other xenobiotics across the cell envelope, contributing to intrinsic multidrug
and solvent resistance in P. putida.
existing_annotations:
- term:
id: GO:0005886
label: plasma membrane
evidence_type: IEA
original_reference_id: GO_REF:0000120
qualifier: located_in
review:
summary: Correct cellular component. The RND transporter subunit is a multi-pass integral protein of the bacterial plasma (inner) membrane (UniProt SUBCELLULAR LOCATION; multi-pass membrane protein). Accept as the informative localization.
action: ACCEPT
- term:
id: GO:0015562
label: efflux transmembrane transporter activity
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: enables
review:
summary: Core molecular function. MexB-type RND proteins are the energized efflux transporter subunit that exports substrates outward across the membrane. Matches the UniProt "Efflux pump membrane transporter" name and RND family assignment. Accept.
action: ACCEPT
- term:
id: GO:0016020
label: membrane
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: located_in
review:
summary: Correct but general. "Membrane" is a broad parent of the plasma membrane localization already annotated. Keep as non-core in favor of the more specific GO:0005886.
action: KEEP_AS_NON_CORE
- term:
id: GO:0022857
label: transmembrane transporter activity
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: enables
review:
summary: Correct but general parent of the efflux transporter activity. Keep as non-core in favor of the more specific efflux/xenobiotic transporter terms.
action: KEEP_AS_NON_CORE
- term:
id: GO:0042908
label: xenobiotic transport
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: involved_in
review:
summary: Core biological process. The pump exports structurally diverse xenobiotics (antibiotics, solvents, dyes) out of the cell. Accept as a defining biological role.
action: ACCEPT
- term:
id: GO:0042910
label: xenobiotic transmembrane transporter activity
evidence_type: IEA
original_reference_id: GO_REF:0000118
qualifier: enables
review:
summary: Core molecular function describing the substrate range. The transporter moves xenobiotics across the membrane; together with the efflux directionality term (GO:0015562) this captures the activity. Accept.
action: ACCEPT
- term:
id: GO:0055085
label: transmembrane transport
evidence_type: IEA
original_reference_id: GO_REF:0000002
qualifier: involved_in
review:
summary: Correct but general parent process of xenobiotic transport. Keep as non-core in favor of the more specific GO:0042908.
action: KEEP_AS_NON_CORE
core_functions:
- description: Proton-motive-force-driven RND inner-membrane efflux transporter that expels a broad range of antibiotics and other xenobiotics out of the cell as part of a tripartite multidrug efflux system
supported_by:
- reference_id: GO_REF:0000118
supporting_text: xenobiotic transmembrane transporter activity assigned to Q88HA4; member of the resistance-nodulation-cell division (RND) transporter family
molecular_function:
id: GO:0042910
label: xenobiotic transmembrane transporter activity
directly_involved_in:
- id: GO:0042908
label: xenobiotic transport
references:
- id: GO_REF:0000002
title: Gene Ontology annotation through association of InterPro records with GO
terms
findings: []
- id: GO_REF:0000118
title: TreeGrafter-generated GO annotations
findings: []
- id: GO_REF:0000120
title: Combined Automated Annotation using Multiple IEA Methods
findings: []