Component
Human BCO2a precursor isoform
Human BCO2a precursor isoform. Species, exposure and limitations are retained in each linked claim.
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 it acts on
The BCO2a targeting sequence directed a reporter to mitochondria in ARPE-19 cells; this experiment establishes mitochondrial import, not precise membrane topology.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/lutein-research/32873706.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1555914c4a5090c968595f2aba72ce276054594a66423916be600a600a28349f", "start_char": 0, "end_char": 1517, "text_sha256": "1555914c4a5090c968595f2aba72ce276054594a66423916be600a600a28349f"}
- experimental_model
- Isoform targeting, recombinant expression and enzyme assays
- exposure
- Removal of N-terminal mitochondrial targeting sequence; expression optimization
- limitations
- Activity of processed recombinant protein does not quantify retinal flux; mouse chimeric substrate results remain mouse-specific.
- nutrient_topic
- Lutein research collection; topical membership is not evidence of a direct dietary effect. · Lutein
- organism
- Human BCO2 isoforms and engineered mouse protein
- plain_language
- An amino-terminal address directs the protein into mitochondria.
- primary_references
- [lutein-p32873706] The human mitochondrial enzyme BCO2 exhibits catalytic activity toward carotenoids and apocarotenoids. (2020). https://pubmed.ncbi.nlm.nih.gov/32873706/ DOI: 10.1074/jbc.ra120.015515
- tissue_or_cell_type
- ARPE-19 cells and bacterial expression
Lutein: metabolism, signaling and nutrient connections (2026-09-17) · lines 294–305
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isoform targeting, recombinant expression and enzyme assays · source_derived_draft · unverified_draft
### lutein-bco2-targeting The BCO2a targeting sequence directed a reporter to mitochondria in ARPE-19 cells; this experiment establishes mitochondrial import, not precise membrane topology. Condition category: normal nutrient_topic: Lutein research collection; topical membership is not evidence of a direct dietary effect. plain_language: An amino-terminal address directs the protein into mitochondria. organism: Human BCO2 isoforms and engineered mouse protein tissue_or_cell_type: ARPE-19 cells and bacterial expression experimental_model: Isoform targeting, recombinant expression and enzyme assays limitations: Activity of processed recombinant protein does not quantify retinal flux; mouse chimeric substrate results remain mouse-specific. exposure: Removal of N-terminal mitochondrial targeting sequence; expression optimization evidence_span: {"source_cache": "artifacts/lutein-research/32873706.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "1555914c4a5090c968595f2aba72ce276054594a66423916be600a600a28349f", "start_char": 0, "end_char": 1517, "text_sha256": "1555914c4a5090c968595f2aba72ce276054594a66423916be600a600a28349f"} [lutein-p32873706] The human mitochondrial enzyme BCO2 exhibits catalytic activity toward carotenoids and apocarotenoids. (2020). https://pubmed.ncbi.nlm.nih.gov/32873706/ DOI: 10.1074/jbc.ra120.015515
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.