Component

Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1

Context-specific entity; species, compartment and exposure are stated on each claim.

7 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. OSGEPL1 deletion in HEK293T cells reduced aminoacylation of mitochondrial tRNA Thr and tRNA Lys and altered other tRNA modifications.

    Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1 → Human mitochondrial threonine and lysine tRNA charging source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_access
    Primary abstract
    experimental_model
    Human HEK293T knockout and tRNA modification/aminoacylation measurements.
    limitations
    The result identifies a tRNA-modification requirement, not a dietary lysine shortage.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    Threonine-derived chemistry supports the handling of another amino acid too.
    primary_references
    Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 154–160

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human HEK293T knockout and tRNA modification/aminoacylation measurements. · source_derived_draft · unverified_draft

    ## l-threonine-osgepl1-charging Threonine-derived chemistry supports the handling of another amino acid too. OSGEPL1 deletion in HEK293T cells reduced aminoacylation of mitochondrial tRNA Thr and tRNA Lys and altered other tRNA modifications. Model: Human HEK293T knockout and tRNA modification/aminoacylation measurements. Limitations: The result identifies a tRNA-modification requirement, not a dietary lysine shortage. Evidence access: Primary abstract Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    Complete structured claim and evidence

  2. Mitochondrial t6A37 hypomodification after OSGEPL1 deletion caused near-cognate codon misreading and amino-acid misincorporation.

    Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1 → Human mitochondrial near-cognate codon misreading source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_access
    Primary abstract
    experimental_model
    Human HEK293T knockout; mitochondrial protein and translation analyses.
    limitations
    Knockout cells remained viable; physiological consequences cannot be inferred from mistranslation alone.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    Loss of an RNA mark can change translation accuracy as well as speed.
    primary_references
    Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 162–168

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human HEK293T knockout; mitochondrial protein and translation analyses. · source_derived_draft · unverified_draft

    ## l-threonine-osgepl1-fidelity Loss of an RNA mark can change translation accuracy as well as speed. Mitochondrial t6A37 hypomodification after OSGEPL1 deletion caused near-cognate codon misreading and amino-acid misincorporation. Model: Human HEK293T knockout; mitochondrial protein and translation analyses. Limitations: Knockout cells remained viable; physiological consequences cannot be inferred from mistranslation alone. Evidence access: Primary abstract Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    Complete structured claim and evidence

  3. OSGEPL1 knockout reduced mitochondrial translation and impaired respiration in human cells.

    Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1 → Human mitochondrial translation dependent on t6A37 source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_access
    Primary abstract
    experimental_model
    Human knockout cell experiments.
    limitations
    Loss of the enzyme is not equivalent to inadequate dietary threonine.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    An amino-acid-derived RNA mark depends on its own installing enzyme.
    primary_references
    CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 146–152

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human knockout cell experiments. · source_derived_draft · unverified_draft

    ## l-threonine-osgepl1-loss An amino-acid-derived RNA mark depends on its own installing enzyme. OSGEPL1 knockout reduced mitochondrial translation and impaired respiration in human cells. Model: Human knockout cell experiments. Limitations: Loss of the enzyme is not equivalent to inadequate dietary threonine. Evidence access: Primary abstract CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4
    Complete structured claim and evidence

  4. Wild-type OSGEPL1 restored mitochondrial function, whereas a tRNA-binding-defective OSGEPL1 construct did not.

    Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1 → Mitochondrial function in OSGEPL1-deficient human cells source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    evidence_access
    Primary abstract
    experimental_model
    Genetic complementation of knockout cells.
    limitations
    The same study observed translation disruption without overt baseline heart deficiency in Osgepl1-deleted mice; tissue and challenge matter.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    Restoring a protein helps only if it retains the required molecular function.
    primary_references
    Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 170–176

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Genetic complementation of knockout cells. · source_derived_draft · unverified_draft

    ## l-threonine-osgepl1-rescue Restoring a protein helps only if it retains the required molecular function. Wild-type OSGEPL1 restored mitochondrial function, whereas a tRNA-binding-defective OSGEPL1 construct did not. Model: Genetic complementation of knockout cells. Limitations: The same study observed translation disruption without overt baseline heart deficiency in Osgepl1-deleted mice; tissue and challenge matter. Evidence access: Primary abstract Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    Complete structured claim and evidence

What acts on it

  1. Human YRDC and OSGEPL1 supported mitochondrial t6A37 formation using L-threonine, ATP and CO2/bicarbonate as substrates.

    Human threonylcarbamoyladenylate synthase / YRDC → Human mitochondrial tRNA threonylcarbamoyltransferase / OSGEPL1 source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Human mitochondrial tRNA-modification reconstitution and cellular experiments.
    limitations
    The mark occurs on multiple tRNAs; it is not restricted to the tRNA that carries threonine.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    Threonine helps make a decoding mark on tRNA, separate from being loaded for protein synthesis.
    primary_references
    CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 122–128

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human mitochondrial tRNA-modification reconstitution and cellular experiments. · source_derived_draft · unverified_draft

    ## l-threonine-trna-mark-substrates Threonine helps make a decoding mark on tRNA, separate from being loaded for protein synthesis. Human YRDC and OSGEPL1 supported mitochondrial t6A37 formation using L-threonine, ATP and CO2/bicarbonate as substrates. Model: Human mitochondrial tRNA-modification reconstitution and cellular experiments. Limitations: The mark occurs on multiple tRNAs; it is not restricted to the tRNA that carries threonine. Evidence access: Primary abstract CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. The measured bicarbonate/CO2 Km for t6A37 formation was 31 millimolar; human cells cultured without bicarbonate had less t6A37 in mitochondrial tRNAs.

    Bicarbonate ion → tRNA-bound N6-threonylcarbamoyladenosine / t6A37 source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Reconstituted enzyme kinetics and bicarbonate-deprived human cell culture.
    limitations
    The culture manipulation is not a bicarbonate supplementation trial or a clinical intracellular threshold.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    An additional substrate can limit the threonine-dependent reaction.
    primary_references
    CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 138–144

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Reconstituted enzyme kinetics and bicarbonate-deprived human cell culture. · source_derived_draft · unverified_draft

    ## l-threonine-bicarbonate-limitation An additional substrate can limit the threonine-dependent reaction. The measured bicarbonate/CO2 Km for t6A37 formation was 31 millimolar; human cells cultured without bicarbonate had less t6A37 in mitochondrial tRNAs. Model: Reconstituted enzyme kinetics and bicarbonate-deprived human cell culture. Limitations: The culture manipulation is not a bicarbonate supplementation trial or a clinical intracellular threshold. Evidence access: Primary abstract CO2-sensitive tRNA modification associated with human mitochondrial disease. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29760464/ · DOI 10.1038/s41467-018-04250-4
    Complete structured claim and evidence

  2. The t6A pathway first forms threonylcarbamoyladenylate from threonine, bicarbonate and ATP; OSGEPL1 then transfers the threonylcarbamoyl group to mitochondrial tRNA A37.

    Human threonylcarbamoyladenylate synthase / YRDC → L-Threonylcarbamoyladenylate / TC-AMP source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract and accessible primary-paper pathway description
    experimental_model
    Primary paper pathway description supporting human mitochondrial experiments.
    limitations
    The reaction sequence is described in the primary paper introduction; the 2024 study primarily tests loss of the downstream enzyme.
    nutrient_topic
    L-Threonine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Threonine
    plain_language
    An activated intermediate links nutrient supply to an RNA modification.
    primary_references
    Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013

    L-Threonine: translation, intestinal barrier, metabolism and cross-nutrient mechanisms (2026-09-19) · lines 130–136

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary paper pathway description supporting human mitochondrial experiments. · source_derived_draft · unverified_draft

    ## l-threonine-trna-intermediate An activated intermediate links nutrient supply to an RNA modification. The t6A pathway first forms threonylcarbamoyladenylate from threonine, bicarbonate and ATP; OSGEPL1 then transfers the threonylcarbamoyl group to mitochondrial tRNA A37. Model: Primary paper pathway description supporting human mitochondrial experiments. Limitations: The reaction sequence is described in the primary paper introduction; the 2024 study primarily tests loss of the downstream enzyme. Evidence access: Primary abstract and accessible primary-paper pathway description Multifaceted roles of t6A biogenesis in efficiency and fidelity of mitochondrial gene expression. · 2024 · https://pubmed.ncbi.nlm.nih.gov/38227555/ · DOI 10.1093/nar/gkae013
    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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