Qdpr notes

• UniProtKB:P11348 states: FUNCTION: Catalyzes the conversion of quinonoid dihydrobiopterin into tetrahydrobiopterin. [UniProtKB:P11348].
• Core interpretation: quinonoid dihydrobiopterin reduction during tetrahydrobiopterin recycling/biosynthesis.
• Accepted direct GO terms include: 6,7-dihydropteridine reductase activity, pteridine-containing compound metabolic process, tetrahydrobiopterin biosynthetic process.
• Non-core/context terms are mostly localization, binding/cofactor, inferred pathway context, or exposure-response annotations; generic parent terms are modified when a specific catalytic term is available.

Re-review 2026-10-04

• GOA refresh (commit a3cf70b6d): no new rows and no retired rows; only WITH/FROM and
  qualifier backfill on the 24 existing rows. 0 PENDING.
• Description rewritten as standalone biology (previous text described what "the review
  accepts"); facts from UniProt P11348 (SDR family, homodimer) and the falcon report.
• GO:0010044 response to aluminum ion (IEP, PMID:3477172): MARK_AS_OVER_ANNOTATED -> UNDECIDED.
  The cached record is title-only ("The effect of lead and aluminium on rat dihydropteridine
  reductase"), so whether the observation was direct enzyme inhibition or regulated expression
  cannot be read; the earlier verdict rested on an unread study.
• The other four IEP response/development rows keep MARK_AS_OVER_ANNOTATED, with the generic
  boilerplate reason replaced by what overshoots in each study:
• liver development: an activity pattern, "the developmental upsurge of dihydropteridine
  reductase ... begins earlier than does that of phenylalanine hydroxylase" PMID:710385.
• response to lead ion: lead "inhibit[s] dihydropteridine reductase" PMID:3815851; the enzyme
  is the toxicant's target, not a responder.
• response to glucagon: glucagon "induced liver dihydropteridine reductase more than twofold"
  PMID:4155291; an induced output with no shown role in the glucagon response.
• cellular response to xenobiotic stimulus: only theophylline lowered activity, at 96 h
  PMID:2484967.
• Positive abstract support added to experimental ACCEPT/KEEP rows whose quotes were only
  methods sentences: PMID:1898002 (bacteria "demonstrate conversion of quinonoid
  dihydropteridines to their tetrahydro forms"), PMID:9235988 (rate-limiting "release of the
  tetrahydropterin product"), PMID:8631945 (active site "requires bound cofactor"),
  PMID:1639779 (native enzyme "has a considerable preference for NADH").
• GO:0006729 tetrahydrobiopterin biosynthetic process rows kept ACCEPT: DHPR regenerates BH4
  from qBH2, which is formation of BH4 within the term definition, and human QDPR carries the
  same term by IBA.
• Open question for a human: PMID:3477172 (aluminium) needs the full paper to adjudicate.