Component
Hydroxyethylidene-ThDP enamine
Post-decarboxylation two-carbon ThDP enamine/carbanion intermediate; distinct from protonated hydroxyethyl-ThDP.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
Where it participates (unsigned role)
Human PDH E1 forms a covalent lactyl-ThDP intermediate from pyruvate and decarboxylates it, retaining the two-carbon fragment on ThDP.
Experimental context and source evidence
- evidence
- [{"paper_key": "seifert-2006-pdh-catalysis", "source_bundle": "artifacts/thiamine_metabolism_sources.json", "passage_ids": ["abstract"], "locator": "Primary publication abstract", "preservation": "Exact text retained in the source bundle; full source document retained when openly retrievable."}]
- experimental_model
- Recombinant human E1; transient kinetics.
- limitations
- Purified-system evidence; nutritional response was not tested.
- nutrient
- Thiamine (vitamin B1) · Thiamine (vitamin B1)
- nutrient_topic
- Thiamine research collection; topical membership is not evidence of a direct dietary effect. · Thiamine (vitamin B1)
- organism
- Homo sapiens
- plain_language
- Activated vitamin B1 temporarily holds pyruvate while one carbon leaves as carbon dioxide. This is the first reaction, before acetyl-CoA is made.
- primary_references
- [seifert-2006-pdh-catalysis] Direct kinetic evidence for half-of-the-sites reactivity in the E1 component of the human pyruvate dehydrogenase multienzyme complex through alternating sites cofactor activation (2006). https://pubmed.ncbi.nlm.nih.gov/17042496/ DOI: 10.1021/bi061582l
- tissue_or_cell_type
- Purified mitochondrial enzyme
Thiamine: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 663–674
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant human E1; transient kinetics. · source_derived_draft · unverified_draft
### b1-pdh-pyruvate-covalent-decarboxylation Human PDH E1 forms a covalent lactyl-ThDP intermediate from pyruvate and decarboxylates it, retaining the two-carbon fragment on ThDP. Condition category: normal nutrient_topic: Thiamine research collection; topical membership is not evidence of a direct dietary effect. plain_language: Activated vitamin B1 temporarily holds pyruvate while one carbon leaves as carbon dioxide. This is the first reaction, before acetyl-CoA is made. organism: Homo sapiens tissue_or_cell_type: Purified mitochondrial enzyme experimental_model: Recombinant human E1; transient kinetics. limitations: Purified-system evidence; nutritional response was not tested. evidence: [{"paper_key": "seifert-2006-pdh-catalysis", "source_bundle": "artifacts/thiamine_metabolism_sources.json", "passage_ids": ["abstract"], "locator": "Primary publication abstract", "preservation": "Exact text retained in the source bundle; full source document retained when openly retrievable."}] nutrient: Thiamine (vitamin B1) [seifert-2006-pdh-catalysis] Direct kinetic evidence for half-of-the-sites reactivity in the E1 component of the human pyruvate dehydrogenase multienzyme complex through alternating sites cofactor activation (2006). https://pubmed.ncbi.nlm.nih.gov/17042496/ DOI: 10.1021/bi061582l
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.