Component
Cellular entry of extracellular 4′-phosphopantetheine
Cellular entry of extracellular 4′-phosphopantetheine. See linked evidence for experiment-specific scope.
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.
What acts on it
The 2015 salvage paper interpreted its experiments as passive membrane entry of extracellular 4′-phosphopantetheine before conversion back to CoA.
Experimental context and source evidence
- cross_nutrient
- false
- experimental_model
- Biochemical extracellular-CoA hydrolysis and eukaryotic cell/organism salvage experiments
- exposure
- Extracellular 4′-phosphopantetheine/CoA exposure; concentrations not extracted.
- limitations
- Author mechanistic interpretation preserved as a hypothesis. Abstract-only extraction cannot exclude extracellular dephosphorylation/rephosphorylation or establish passive uptake in every tissue, serum stability, or blood–brain-barrier delivery.
- nutrient_topic
- Pantothenic acid (vitamin B5) research collection; topical membership is not evidence of a direct dietary effect. · Pantothenate (vitamin B5)
- organism
- Eukaryotic cell/organism models; assay-level species not specified in abstract
- plain_language
- The authors proposed direct entry of the intermediate; the transport route remains a separate question from downstream enzyme activity.
- primary_references
- [b5-bio-salvage2015] Extracellular 4'-phosphopantetheine is a source for intracellular coenzyme A synthesis. (2015). https://pubmed.ncbi.nlm.nih.gov/26322826/ DOI: 10.1038/nchembio.1906
- tissue_or_cell_type
- Cell membrane and intracellular CoA synthesis
Pantothenic acid (vitamin B5): coenzyme A, deficiency and nutrient interactions (2026-09-17) · lines 769–780
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Biochemical extracellular-CoA hydrolysis and eukaryotic cell/organism salvage experiments · source_derived_draft · unverified_draft
### b5-bio-phosphopantetheine-entry-proposal The 2015 salvage paper interpreted its experiments as passive membrane entry of extracellular 4′-phosphopantetheine before conversion back to CoA. Condition category: normal nutrient_topic: Pantothenic acid (vitamin B5) research collection; topical membership is not evidence of a direct dietary effect. plain_language: The authors proposed direct entry of the intermediate; the transport route remains a separate question from downstream enzyme activity. organism: Eukaryotic cell/organism models; assay-level species not specified in abstract tissue_or_cell_type: Cell membrane and intracellular CoA synthesis experimental_model: Biochemical extracellular-CoA hydrolysis and eukaryotic cell/organism salvage experiments limitations: Author mechanistic interpretation preserved as a hypothesis. Abstract-only extraction cannot exclude extracellular dephosphorylation/rephosphorylation or establish passive uptake in every tissue, serum stability, or blood–brain-barrier delivery. exposure: Extracellular 4′-phosphopantetheine/CoA exposure; concentrations not extracted. cross_nutrient: false [b5-bio-salvage2015] Extracellular 4'-phosphopantetheine is a source for intracellular coenzyme A synthesis. (2015). https://pubmed.ncbi.nlm.nih.gov/26322826/ DOI: 10.1038/nchembio.1906
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.