ARBA00089391

id: ARBA00089391
description: 'ARBA00089391 predicts spermidine transmembrane transport (GO:1903711) for fungal proteins containing either MFS multidrug transporter domains (in Taphrinomycotina) or urea active transporter domains (in all Fungi). The rule combines taxonomic restrictions with functionally distinct transporter families.'
status: COMPLETE
rule_type: ARBA
rule:
  rule_id: ARBA00089391
  condition_sets:
  - number: 1
    conditions:
    - condition_type: FUNFAM
      value: 1.20.1250.20:FF:000011
      curie: CATH.FunFam:1.20.1250.20:FF:000011
      label: MFS multidrug transporter, putative
      negated: false
    - condition_type: TAXON
      value: Taphrinomycotina
      curie: NCBITaxon:451866
      label: Taphrinomycotina
      negated: false
    notes: ''
  - number: 2
    conditions:
    - condition_type: FUNFAM
      value: 1.20.1730.10:FF:000006
      curie: CATH.FunFam:1.20.1730.10:FF:000006
      label: Urea active transporter
      negated: false
    - condition_type: TAXON
      value: Fungi
      curie: NCBITaxon:4751
      label: Fungi
      negated: false
    notes: ''
  go_annotations: []
  reviewed_protein_count: 0
  unreviewed_protein_count: 0
  created_date: ''
  modified_date: ''
  entries:
  - id: 1.20.1250.20:FF:000011
    type: FUNFAM
    label: MFS multidrug transporter, putative
    appears_in_condition_sets:
    - 1
    protein_count: 55
    related_entries:
    - relationship: EQUIV
      target_id: 1.20.1730.10:FF:000006
      containment: 0.0
      jaccard_similarity: 0.0
      intersection_count: 0
      exclusive_count: 55
    - relationship: PREDICTS
      target_id: GO:1903711
      containment: 0.218
      jaccard_similarity: 0.058
      intersection_count: 12
      exclusive_count: 43
  - id: 1.20.1730.10:FF:000006
    type: FUNFAM
    label: Urea active transporter
    appears_in_condition_sets:
    - 2
    protein_count: 5
    related_entries:
    - relationship: EQUIV
      target_id: 1.20.1250.20:FF:000011
      containment: 0.0
      jaccard_similarity: 0.0
      intersection_count: 0
      exclusive_count: 5
    - relationship: PREDICTS
      target_id: GO:1903711
      containment: 0.6
      jaccard_similarity: 0.018
      intersection_count: 3
      exclusive_count: 2
review_summary: 'This rule presents significant biological concerns by predicting spermidine transport for two functionally distinct transporter families. The MFS multidrug transporter domain (1.20.1250.20:FF:000011) is associated with broad-spectrum drug efflux, while the urea active transporter domain (1.20.1730.10:FF:000006) is specifically adapted for urea transport. Neither family has established biological connection to spermidine transport. The low coverage (21.8% and 60% respectively) suggests poor predictive accuracy. The taxonomic restrictions appear arbitrary and lack biological justification.'
action: DEPRECATE
action_rationale: 'The rule should be deprecated because it conflates functionally distinct transporter families without biological evidence supporting spermidine transport function. MFS multidrug transporters are specialized for xenobiotic efflux, while urea transporters are adapted for specific nitrogenous waste transport. The low coverage rates indicate poor specificity, and the taxonomic restrictions lack clear biological rationale. The rule is likely to generate false positive annotations.'
suggested_modifications:
- 'N/A - recommend complete removal rather than modification'
parsimony:
  assessment: OVERLY_COMPLEX
  notes: 'The rule combines two functionally unrelated transporter families (MFS multidrug and urea transporters) under different taxonomic constraints without biological justification. This complexity is not warranted and suggests the rule was created by merging disparate functional predictions without proper validation.'
literature_support:
  assessment: NONE
  notes: 'No literature support found linking either MFS multidrug transporters or urea active transporters to spermidine transport. MFS multidrug transporters are well-characterized for xenobiotic efflux, while urea transporters are specialized for nitrogen waste management. Spermidine transport is typically mediated by polyamine-specific transporters with distinct structural and functional characteristics.'
  supported_by:
  - reference_id: 'general biochemical knowledge'
    supporting_text: 'MFS multidrug transporters are characterized by broad substrate specificity for toxic compounds and drugs, not polyamine transport. Urea transporters belong to a distinct family specialized for urea and related compounds.'
condition_overlap:
  assessment: NONE
  notes: 'The two domain conditions show complete disjoint (Jaccard similarity = 0.0), indicating they identify completely different protein sets. This supports the assessment that these are functionally distinct families that should not be grouped under a single annotation rule.'
  supported_by:
  - reference_id: 'file:rules/arba/ARBA00089391/ARBA00089391-analysis.yaml'
    supporting_text: 'jaccard_similarity: 0.0, containment_a_in_b: 0.0, containment_b_in_a: 0.0, interpretation: DISJOINT'
go_specificity:
  assessment: MISMATCHED
  notes: 'GO:1903711 (spermidine transmembrane transport) is a specific and appropriate term, but it mismatches the biological functions of the condition domains. Neither MFS multidrug transporters nor urea active transporters have established roles in spermidine transport based on their known substrate specificities and physiological functions.'
  supported_by:
  - reference_id: 'biochemical knowledge'
    supporting_text: 'Spermidine transport is mediated by specialized polyamine transporters, not by multidrug efflux pumps or urea channels'
taxonomic_scope:
  assessment: UNNECESSARY
  notes: 'The taxonomic restrictions (Taphrinomycotina for MFS multidrug, all Fungi for urea transporters) appear arbitrary and lack biological justification. If these transporters truly mediated spermidine transport, the function would likely be conserved across broader taxonomic groups. The differential taxonomic restrictions suggest these may be annotation artifacts rather than biologically meaningful constraints.'
  supported_by:
  - reference_id: 'file:rules/arba/ARBA00089391/ARBA00089391-analysis.yaml'
    supporting_text: 'Different taxonomic scopes for functionally unrelated transporter families suggest artificial rule construction'
confidence: 0.1
references:
- id: file:rules/arba/ARBA00089391/ARBA00089391-analysis.yaml
  title: Quantitative domain overlap analysis
  findings:
  - statement: 'Domain conditions are completely disjoint with zero overlap, indicating functionally distinct protein families'
- id: 'biochemical literature'
  title: 'Transporter family functional characterization'
  findings:
  - statement: 'MFS multidrug transporters are specialized for xenobiotic efflux, not polyamine transport'
  - statement: 'Urea active transporters are specialized for nitrogenous waste transport, distinct from polyamine systems'
supported_by:
- reference_id: 'file:rules/arba/ARBA00089391/ARBA00089391-analysis.yaml'
  supporting_text: 'Domain overlap analysis reveals complete functional separation with zero Jaccard similarity between condition sets'
- reference_id: 'biochemical knowledge'
  supporting_text: 'MFS multidrug transporters and urea active transporters represent functionally distinct families with no established connection to polyamine transport'