Component

Human ornithine aminotransferase / OAT

Human ornithine aminotransferase / OAT. Species, exposure and limitations are retained in each linked claim.

4 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

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.

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.

Recorded relationships

What it acts on

  1. OAT transfers the ornithine delta-amino group to 2-oxoglutarate, yielding glutamate and glutamate semialdehyde, which cyclizes to P5C.

    Human ornithine aminotransferase / OAT → L-Glutamate-5-semialdehyde source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/citrulline-research/9514741.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0", "start_char": 0, "end_char": 2979, "text_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0"}
    experimental_model
    Recombinant enzyme crystal structure
    exposure
    PLP-bound enzyme structure
    limitations
    The described reaction direction is ornithine transamination; this structure alone does not quantify reverse flux in human intestine.
    nutrient_topic
    Citrulline research collection; topical membership is not evidence of a direct dietary effect. · L-Citrulline
    organism
    Human OAT
    plain_language
    This is an ornithine-processing reaction; its direction depends on the biological setting.
    primary_references
    [citrulline-p9514741] Crystal structure of human recombinant ornithine aminotransferase. (1998). https://pubmed.ncbi.nlm.nih.gov/9514741/ DOI: 10.1006/jmbi.1997.1583
    tissue_or_cell_type
    Mitochondrial ornithine transamination

    Citrulline: arginine recycling, nitrogen disposal and nutrient connections (2026-09-17) · lines 346–357

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme crystal structure · source_derived_draft · unverified_draft

    ### citrulline-oat-reaction OAT transfers the ornithine delta-amino group to 2-oxoglutarate, yielding glutamate and glutamate semialdehyde, which cyclizes to P5C. Condition category: normal nutrient_topic: Citrulline research collection; topical membership is not evidence of a direct dietary effect. plain_language: This is an ornithine-processing reaction; its direction depends on the biological setting. organism: Human OAT tissue_or_cell_type: Mitochondrial ornithine transamination experimental_model: Recombinant enzyme crystal structure limitations: The described reaction direction is ornithine transamination; this structure alone does not quantify reverse flux in human intestine. exposure: PLP-bound enzyme structure evidence_span: {"source_cache": "artifacts/citrulline-research/9514741.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0", "start_char": 0, "end_char": 2979, "text_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0"} [citrulline-p9514741] Crystal structure of human recombinant ornithine aminotransferase. (1998). https://pubmed.ncbi.nlm.nih.gov/9514741/ DOI: 10.1006/jmbi.1997.1583
    Complete structured claim and evidence

What acts on it

  1. Human OAT bound pyridoxal phosphate through a Schiff base to Lys292.

    PLP → Human ornithine aminotransferase / OAT source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/citrulline-research/9514741.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0", "start_char": 0, "end_char": 2979, "text_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0"}
    experimental_model
    Recombinant enzyme crystal structure
    exposure
    PLP-bound enzyme structure
    limitations
    The described reaction direction is ornithine transamination; this structure alone does not quantify reverse flux in human intestine.
    nutrient_topic
    Citrulline research collection; topical membership is not evidence of a direct dietary effect. · L-Citrulline
    organism
    Human OAT
    plain_language
    Vitamin B6 has a defined role in the machinery handling ornithine.
    primary_references
    [citrulline-p9514741] Crystal structure of human recombinant ornithine aminotransferase. (1998). https://pubmed.ncbi.nlm.nih.gov/9514741/ DOI: 10.1006/jmbi.1997.1583
    tissue_or_cell_type
    Mitochondrial ornithine transamination

    Citrulline: arginine recycling, nitrogen disposal and nutrient connections (2026-09-17) · lines 333–344

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme crystal structure · source_derived_draft · unverified_draft

    ### citrulline-oat-plp Human OAT bound pyridoxal phosphate through a Schiff base to Lys292. Condition category: normal nutrient_topic: Citrulline research collection; topical membership is not evidence of a direct dietary effect. plain_language: Vitamin B6 has a defined role in the machinery handling ornithine. organism: Human OAT tissue_or_cell_type: Mitochondrial ornithine transamination experimental_model: Recombinant enzyme crystal structure limitations: The described reaction direction is ornithine transamination; this structure alone does not quantify reverse flux in human intestine. exposure: PLP-bound enzyme structure evidence_span: {"source_cache": "artifacts/citrulline-research/9514741.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0", "start_char": 0, "end_char": 2979, "text_sha256": "cca17abd35f0211a043dd3cc8883369e230209206ff62b62242197f90201cea0"} [citrulline-p9514741] Crystal structure of human recombinant ornithine aminotransferase. (1998). https://pubmed.ncbi.nlm.nih.gov/9514741/ DOI: 10.1006/jmbi.1997.1583
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Isotope tracing with gene silencing linked glutamine/glutamate-derived proline mainly to PYCR1/PYCR2 and ornithine-derived proline mainly to PYCRL in human melanoma cells.

    L-Ornithine → L-Proline source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary full text
    experimental_model
    Lu1205 cells; 1 mM labeled precursors for eight hours; ornithine labeling required omission of extracellular proline.
    limitations
    The ornithine experiment used conditions the authors regarded as likely nonphysiological; no universal exclusive routing rule is inferred.
    nutrient_topic
    L-Proline collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Proline
    plain_language
    Two precursor routes can feed the same product through differently placed enzymes.
    primary_references
    Functional specialization in proline biosynthesis of melanoma. · 2012 · https://pubmed.ncbi.nlm.nih.gov/23024808/ · DOI 10.1371/journal.pone.0045190

    L-Proline: synthesis, collagen processing, redox metabolism and cross-nutrient mechanisms (2026-09-19) · lines 38–44

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Lu1205 cells; 1 mM labeled precursors for eight hours; ornithine labeling required omission of extracellular proline. · source_derived_draft · unverified_draft

    ## l-proline-precursor-routing Two precursor routes can feed the same product through differently placed enzymes. Isotope tracing with gene silencing linked glutamine/glutamate-derived proline mainly to PYCR1/PYCR2 and ornithine-derived proline mainly to PYCRL in human melanoma cells. Model: Lu1205 cells; 1 mM labeled precursors for eight hours; ornithine labeling required omission of extracellular proline. Limitations: The ornithine experiment used conditions the authors regarded as likely nonphysiological; no universal exclusive routing rule is inferred. Evidence access: Primary full text Functional specialization in proline biosynthesis of melanoma. · 2012 · https://pubmed.ncbi.nlm.nih.gov/23024808/ · DOI 10.1371/journal.pone.0045190
    Complete structured claim and evidence

  2. OAT transfers the ornithine delta-amino group to 2-oxoglutarate, producing glutamate-5-semialdehyde and glutamate.

    L-Ornithine → L-Glutamate-5-semialdehyde source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Recombinant human OAT structure and described catalytic reaction.
    limitations
    Reversible pathway; net flux depends on tissue and substrate conditions.
    nutrient_topic
    L-Arginine collection; tissue, species, dose and formulation distinctions retained. · L-Arginine
    plain_language
    Ornithine also feeds a pathway connected to proline metabolism.
    primary_references
    Crystal structure of human recombinant ornithine aminotransferase. · 1998 · https://pubmed.ncbi.nlm.nih.gov/9514741/ · DOI 10.1006/jmbi.1997.1583

    L-Arginine: transport, metabolic branches, nutrient interactions, availability and discovery questions (2026-09-18) · lines 118–124

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Recombinant human OAT structure and described catalytic reaction. · source_derived_draft · unverified_draft

    ## arg-oat-reaction Ornithine also feeds a pathway connected to proline metabolism. OAT transfers the ornithine delta-amino group to 2-oxoglutarate, producing glutamate-5-semialdehyde and glutamate. Model: Recombinant human OAT structure and described catalytic reaction. Limitations: Reversible pathway; net flux depends on tissue and substrate conditions. Evidence access: Primary abstract Crystal structure of human recombinant ornithine aminotransferase. · 1998 · https://pubmed.ncbi.nlm.nih.gov/9514741/ · DOI 10.1006/jmbi.1997.1583
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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