identifier: METPO:2000009
label: uses as electron donor
definition: An OBJECT_PROPERTY relating an organism to a chemical entity (e.g. a CHEBI
  class) that the organism oxidises as an electron donor for energy conservation or
  biosynthetic reductant. The intended use is predicate + class composition at assertion
  time, e.g. `<organism> METPO:2000009 CHEBI:18276` ("organism uses molecular hydrogen
  as electron donor").
definition_source: DOI:10.1146/annurev.micro.55.1.485
trait_category: METABOLISM
term_kind: OBJECT_PROPERTY
mapping_status: REVIEWED
parent_traits:
- METPO:2000001
synonyms:
- synonym_text: electron donor
  synonym_type: RELATED_SYNONYM
  source: metpo.owl
domain: https://w3id.org/metpo/1000525
range_: http://purl.obolibrary.org/obo/CHEBI_24431
xrefs:
- MICRO:0001462
evidence:
- reference: DOI:10.1146/annurev.micro.55.1.485
  snippet: electron donor
  notes: Chemolithotrophy review supports the "electron donor" relation as the central
    descriptor for chemolithotrophic and chemo-organotrophic energy conservation;
    the relation is composed at assertion time with the specific donor chemical (H2,
    NH3, Fe2+, S, organic acids, etc.).
curation_history:
- timestamp: '2026-05-05T01:35:46.953972+00:00'
  curator: seed_from_metpo
  action: SEEDED_FROM_METPO
  changes: imported from data/raw/metpo.owl (OBJECT_PROPERTY)
  llm_assisted: false
- timestamp: '2026-05-10T00:00:00-07:00'
  curator: codex
  action: DEPRECATED_PROPERTY_RECORD
  changes: Deprecated generic chemical-use relation carrier; later replacement should
    use more specific trait records that combine the relation with the chemical, metabolic
    role, growth condition, and positive or negative usage context.
  llm_assisted: true
- timestamp: '2026-05-16T08:00:00-07:00'
  curator: claude
  action: UNDEPRECATED_AS_COMPOSITION_PRIMITIVE
  changes: Restored from DEPRECATED to REVIEWED. METPO modeling uses the predicate
    + class composition pattern (this OBJECT_PROPERTY composed with a CHEBI electron-donor
    chemical at assertion time) rather than precomposed substrate-specific TraitRecords.
    Added DOI-backed definition and evidence.
  llm_assisted: true
- timestamp: '2026-05-17T10:00:00-07:00'
  curator: claude
  action: ADDED_EXTERNAL_PREDICATE_XREF
  changes: 'Added xrefs [''MICRO:0001462''] to record an external equivalence predicate
    (MICRO:0001462 ''uses electron donor''). MICRO:0001462 ''uses electron donor''
    is the direct equivalent. Source: OLS4 property search.'
  llm_assisted: true