BRS2(FM2) - Transsulfuration & Redox Coupling
1. Definition
Integrated regulation of Transsulfuration Pathway, and Glutathione Synthesis, influencing homocysteine disposal to cysteine and glutathione production.
2. Functional Outcome Context
These outcomes describe translational contexts for the FM as an integrated biological capacity. They are not single-mechanism treatment claims. Confidence may increase where multiple child PMs converge on the same functional outcome.
No functional outcome context currently mapped.
3. Intervention Breakdown
Food-State Dominant
4. Functional Role
↑ cysteine generation; ↑ glutathione synthesis; ↓ oxidative load
5. Mechanistic Basis (Integrated FM Narrative)
Transsulfuration & redox coupling emerges from the coordinated interaction of several primary mechanisms and supporting biological pools.
5.1 Core Primary Mechanisms
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BRS2-FM2-PM5 — Transsulfuration Pathway Diversion of homocysteine toward cysteine production through transsulfuration.
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BRS2-FM2-PM6 — Glutathione Synthesis Synthesis of glutathione from cysteine, glycine, and related cofactors downstream of transsulfuration.
5.2 Supporting Biological Pools (Key Constraints)
- BRS2(KC2) — Methionine & Transsulfuration Substrate Pool Provides the shared amino-acid substrate pool required for methionine metabolism and downstream sulfur-amino-acid pathways.
5.3 Integrated Functional Narrative
Together, these PMs operationalise BRS2(FM2) as a coordinated transsulfuration and redox control point.
5.4 Functional Failure Modes
Transsulfuration & redox coupling may weaken when methionine & transsulfuration substrate pool declines or when low protein quality or insufficient sulfur-amino-acid intake.
Low protein quality or insufficient sulfur-amino-acid intake may reduce BRS2(KC2) — Methionine & Transsulfuration Substrate Pool. Chronic methionine substrate insufficiency may further strain pool availability, increased glutathione demand, increased oxidative burden driving sulfur-amino-acid utilisation, while restrictive dietary patterns reducing substrate diversity.
These pressures may impair BRS2-FM2-PM5 — Transsulfuration Pathway, and weaken BRS2-FM2-PM6 — Glutathione Synthesis. At the FM level, this may shift BRS2(FM2) toward reduced transsulfuration & redox coupling performance.
6. Connected Mechanisms
- None listed