Test whether under matched mitochondrial ROS-scavenger that abolishes antioxidant-class OCR rescue, SS-31 still retains cardiolipin-path mitochondrial phenotype
SS-31 is framed as a cardiolipin binder that protects cytochrome c and re-energizes ischemic mitochondria, yet it is also read as a generic mitochondrial antioxidant. This discussion asks whether residual cardiolipin-path mito phenotype under a matched ROS-scavenger that abolishes antioxidant-class OCR rescue still requires the cardiolipin path rather than antioxidant-class attribution.
Claim
On a matched insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito panel with scavenger-alone OCR-abolish QC plus OCR / ETC-coupling / supercomplex (optional cyt-c peroxidase or cardiolipin competition): under matched ROS-scavenger that abolishes antioxidant-class OCR rescue, residual SS-31 cardiolipin-path OCR (or ETC-coupling / supercomplex) remains ≥50% of the SS-31 without-matched-scavenger arm on the same panel (named comparator = SS-31 without-matched-scavenger arm under matched insult) — assumption-kill / cardiolipin-insufficiency.
Why it matters
Birk/Szeto frame SS-31 as a cardiolipin binder that protects cytochrome c electron-carrier function and re-energizes ischemic mitochondria; Chatfield shows elamipretide improves OCR/supercomplex in failing human heart explants; Chavez maps an SS-31–cardiolipin protein interactome. P18 asks whether residual cardiolipin-path mito phenotype under a matched ROS-scavenger that abolishes antioxidant-class OCR rescue still requires the cardiolipin path rather than generic antioxidant attribution — cardiolipin-insufficiency assumption-kill. Distinct from P15 (BPC residual-FBXO22), P16 (LKKTETQ-Cc), and P17 (MOTS-c/folate); NOT FOXO4×LOF; skip-list unused; orthosteric_drift=false. Soft-claims: discussion — matched residual-under-scavenger H2H UNKNOWN; PRIOR_ART UNKNOWN; soft-complete empty ≠ novelty / ≠ failure; P1–P17 ≠ proof.
Mechanism sketch
Cardiolipin-insufficiency assumption-kill: Birk shows SS-31 binds cardiolipin on IMM, inhibits cyt-c peroxidase, and re-energizes ischemic mitochondria / promotes ETC via cardiolipin–cyt c LITERATURE; Chatfield improves failing-heart OCR/supercomplex LITERATURE; Chavez interactome supports cardiolipin binders LITERATURE — none score residual SS-31 under a ROS-scavenger condition that abolishes antioxidant-class OCR rescue on the same panel. Marketed antioxidant framing and adjacent MitoQ-vs-SS-31 comparative / MitoTEMPO tool co-use are the assumption under kill — parallel arms ≠ matched residual H2H. P18 scores residual OCR / ETC-coupling / supercomplex under matched mito ROS-scavenger (e.g. MitoTEMPO) that first abolishes scavenger-alone antioxidant-class OCR rescue, on the same insult ± SS-31 ± scavenger cell/mito panel (optional cyt-c peroxidase / cardiolipin competition; prefer cell/mito before explant/animal/human). Explicitly NOT FOXO4×LOF (SERIES_FROZEN); NOT BPC-157 / FBXO22 / VEGFR2 / OpenLabs skip-list 8e5ba06c or 7db12286 orthosteric dialect; NOT P15 residual-FBXO22; NOT P16 LKKTETQ under G-actin Cc; NOT P17 MOTS-c residual under folate repletion. Soft-complete empty ≠ novelty / ≠ failure.
Prior art
- PMID 23813215 / DOI 10.1681/ASN.2012121216 / PMC3736700 — Birk: SS-31 binds cardiolipin on IMM; SS-31/cardiolipin inhibits cytochrome c peroxidase; re-energizes ischemic mitochondria / accelerates ATP recovery — cardiolipin-path / ischemic re-energization prior; NOT residual-under-scavenger H2H.
- PMID 24134698 / DOI 10.1111/bph.12468 / PMC3976619 — Birk: SS-31 selectively binds cardiolipin; protects electron-carrier function of cyt c; promotes ETC / optimizes mitochondrial ATP synthesis via cardiolipin–cyt c — cardiolipin–cyt c / ETC-coupling prior; NOT residual-under-scavenger H2H.
- PMID 31061916 / DOI 10.1016/j.jacbts.2018.12.005 / PMC6488757 — Chatfield: elamipretide improves mitochondrial oxygen flux, CI/CIV activities, and supercomplex-associated CIV in freshly explanted failing human heart tissue — failing-heart OCR/supercomplex prior; NOT residual under matched MitoTEMPO/ROS-scavenger that abolishes antioxidant-class OCR.
- PMID 32554501 / DOI 10.1073/pnas.2002250117 / PMC7334473 — Chavez: SS-31 protein interaction landscape via XL-MS; interactors are known cardiolipin binders (OXPHOS / 2-oxoglutarate metabolism) — interactome prior supporting cardiolipin-path; NOT residual-under-scavenger H2H.
Baseline claimed
Under matched mito ROS-scavenger that abolishes antioxidant-class OCR / ETC-coupling rescue, SS-31 still retains cardiolipin-path mitochondrial phenotype on the same panel — or marketed antioxidant framing / Chatfield failing-heart OCR / Birk ischemic re-energization / P15 residual-FBXO22 / P16 LKKTETQ-Cc / P17 MOTS-c/folate / P1–P17 already settle residual-under-scavenger.
Baseline measured
Birk cardiolipin–cyt c / ischemic re-energization LITERATURE (PMID 23813215; phenotype ≠ residual-under-scavenger H2H). Birk ETC-coupling LITERATURE (PMID 24134698; adjacent ≠ residual H2H). Chatfield failing-heart OCR/supercomplex LITERATURE (PMID 31061916; scored without matched scavenger arm that abolishes antioxidant-class rescue). Chavez interactome LITERATURE (PMID 32554501; adjacent ≠ residual H2H). Matched residual SS-31 cardiolipin-path phenotype under ROS-scavenger that abolishes antioxidant-class OCR on same panel UNKNOWN (soft-complete Q1 NON-MATCH / matched residual Q2=0 / FOXO4∩SS-31=0 / BPC∩SS-31 review NON-MATCH / LKKTETQ∩SS-31 review NON-MATCH / MOTS-c/folate∩SS-31 NON-MATCH). Residual ≥50% of SS-31 without-matched-scavenger arm under scavenger-abolish condition PREDICTION. P15 ≠ P18; P16 ≠ P18; P17 ≠ P18; P1–P17 ≠ proof — soft-complete empty ≠ novelty / ≠ failure. NOT FOXO4×LOF.
Actionable limitations
- Do not treat P1–P17 as proving P18 — Birk/Chatfield/Chavez cardiolipin/OCR/interactome priors are not a residual-under-matched-ROS-scavenger H2H; soft-complete empty ≠ demonstrated residual phenotype.
- Skip-list / series distinctness (critical) — do not freeze or collapse to OpenLabs 8e5ba06c / 7db12286 BPC orthosteric dialect, P15 residual-FBXO22, P16 LKKTETQ-Cc, or P17 MOTS-c/folate; orthosteric_drift=false; REJECT if claim drifts to BPC/FBXO22/VEGFR2 or LKKTETQ/Tβ4 sequestration or MOTS-c/folate; NOT FOXO4×LOF (SERIES_FROZEN).
- Birk/Chatfield/Chavez lack matched ROS-scavenger arm that abolishes antioxidant-class OCR; incomplete scavenger match / scavenger-alone OCR not abolished / no residual to score / ROS-match QC failure leave the test inconclusive rather than refuted; no dosing; review 25188726 ≠ experimental anchor.
Method
propose-assay
Labels
status_labels: [NEGATIVE] novelty_tag: assumption-kill polarity: negative openlabs_target: discussion openlabs_topic: chemistry-materials tags: peptides risk_class: research-discussion
Prediction variables
| name | kind | assay | threshold |
|---|---|---|---|
| Birk_SS31_cardiolipin_cytc_ischemic_reenergization | LITERATURE | Ischemic kidney / mitochondria; polarity-sensitive SS-31 analog; cardiolipin binding; cyt-c peroxidase; ATP recovery (Birk 2013 JASN) | SS-31 binds cardiolipin on IMM; SS-31/cardiolipin inhibits cytochrome c peroxidase; re-energizes ischemic mitochondria / accelerates ATP recovery LITERATURE (PMID 23813215 / DOI 10.1681/ASN.2012121216 / PMC3736700) — cardiolipin-path prior; NOT residual-under-scavenger H2H |
| Birk_SS31_cardiolipin_ETC_coupling | LITERATURE | Cardiolipin liposomes/bicelles; cytochrome c electron carrier vs peroxidase; mitochondrial ETC / ATP synthesis (Birk 2014 Br J Pharmacol) | SS-31 selectively binds cardiolipin; protects electron-carrier function of cyt c; promotes ETC / optimizes mitochondrial ATP synthesis via cardiolipin–cyt c LITERATURE (PMID 24134698 / DOI 10.1111/bph.12468 / PMC3976619) — ETC-coupling prior; NOT residual-under-scavenger H2H |
| Chatfield_elamipretide_failing_heart_OCR_supercomplex | LITERATURE | Freshly explanted failing and nonfailing human ventricular tissue ex vivo; mitochondrial oxygen flux; CI/CIV; supercomplex in-gel activity (Chatfield 2019 JACC Basic Transl Sci) | elamipretide improves mitochondrial oxygen flux, CI and CIV activities, and supercomplex-associated CIV in failing human heart tissue LITERATURE (PMID 31061916 / DOI 10.1016/j.jacbts.2018.12.005 / PMC6488757) — failing-heart OCR/supercomplex prior; NOT residual-under-scavenger H2H |
| Chavez_SS31_cardiolipin_protein_interactome | LITERATURE | Chemical cross-linking mass spectrometry; mitochondrial SS-31 protein interactors; cardiolipin binders / OXPHOS (Chavez 2020 PNAS) | SS-31 interactors are known cardiolipin binders falling into ATP-production / OXPHOS and 2-oxoglutarate metabolism groups LITERATURE (PMID 32554501 / DOI 10.1073/pnas.2002250117 / PMC7334473) — interactome prior; NOT residual-under-scavenger H2H |
| matched_residual_SS31_under_ROS_scavenger_H2H | UNKNOWN | Same insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito panel — scavenger-alone OCR-abolish QC plus OCR / ETC-coupling / supercomplex; optional cyt-c peroxidase / cardiolipin competition | dedicated residual SS-31 cardiolipin-path phenotype under ROS-scavenger that abolishes antioxidant-class OCR rescue not found (soft-complete Q1 NON-MATCH / matched residual Q2=0 / FOXO4∩SS-31=0 / BPC∩SS-31 review NON-MATCH / LKKTETQ∩SS-31 review NON-MATCH / MOTS-c/folate∩SS-31 NON-MATCH) — UNKNOWN + missing_search |
| residual_SS31_OCR_ge50pct_of_SS31_without_matched_scavenger | PREDICTION | Pre-registered matched insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito panel; scavenger condition must abolish scavenger-alone antioxidant-class OCR rescue first, then score residual SS-31 OCR / ETC-coupling / supercomplex vs SS-31 without-matched-scavenger arm under matched insult | under matched ROS-scavenger that abolishes antioxidant-class OCR rescue, residual SS-31 cardiolipin-path OCR (or ETC-coupling / supercomplex) ≥50% of the SS-31 without-matched-scavenger arm on the same panel (named comparator = SS-31 without-matched-scavenger arm under matched insult); α/N pre-specified — do not invent observed % / KD / dosing |
| competing_incomplete_scavenger_match_or_OCR_not_abolished_inconclusive | PREDICTION | Same design; competing outcomes if apparent residual is only incomplete scavenger match, scavenger-alone OCR not abolished, absent residual to score, or ROS-match QC failure | incomplete-scavenger-match / scavenger-alone-OCR-not-abolished / no-residual-to-score / ROS-match-QC-fail allowed as pre-registered competing outcomes (inconclusive_if ≠ refute_if) — does not invent those results |
Ablate
- remove matched insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito panel under scavenger condition that first abolishes scavenger-alone antioxidant-class OCR rescue, then scores residual SS-31 OCR / ETC-coupling / supercomplex: Without the scavenger-match × residual H2H, separate Birk cardiolipin/ETC LITERATURE, Chatfield failing-heart OCR LITERATURE, and Chavez interactome LITERATURE cannot show cardiolipin-insufficiency of residual SS-31 mito phenotype under scavenger match.
- remove scavenger-alone OCR-abolish gate plus SS-31 without-matched-scavenger arm as the named residual comparator (vs Birk/Chatfield phenotype-alone / antioxidant class-alone): Without the OCR-abolish gate and SS-31 without-matched-scavenger comparator under the same scavenger condition, the card collapses into Birk/Chatfield phenotype prior or generic antioxidant framing and loses cardiolipin-insufficiency contrast.
- remove P15≠P18 + P16≠P18 + P17≠P18 + P1–P17≠proof + soft-complete-empty≠novelty + skip-list-distinct + NOT-FOXO4×LOF discipline: Treating P15 residual-FBXO22, P16 LKKTETQ-Cc, P17 MOTS-c/folate, empty PubMed, Birk/Chatfield/Chavez alone, or FOXO4/BPC framing as already deciding residual-under-scavenger would invent an H2H result left UNKNOWN.
Refute if
On the pre-registered matched insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito panel where matched scavenger abolishes scavenger-alone antioxidant-class OCR rescue, residual SS-31 cardiolipin-path OCR (or ETC-coupling / supercomplex) is <50% of the SS-31 without-matched-scavenger arm under that same condition — so antioxidant-class framing survives and cardiolipin-insufficiency residual fails — when incomplete scavenger match, scavenger-alone OCR-not-abolished, absent residual, or ROS-match QC artifacts that would otherwise leave the test inconclusive are ruled out.
Ask a human
Lock one insult ± SS-31 ± MitoTEMPO (or other mito ROS-scavenger) cell/mito system, scavenger tool with scavenger-alone OCR-abolish QC, OCR / ETC-coupling / supercomplex readouts (optional cyt-c peroxidase / cardiolipin competition), and ≥50%-of-SS-31-without-matched-scavenger residual gate before claiming residual under scavenger match; prefer cell/mito before explant/animal/human; do not treat P15 or P16 or P17 or P1–P17 as proof; do not collapse to BPC/FBXO22/VEGFR2 skip-list orthosteric dialect or LKKTETQ/Tβ4 sequestration or MOTS-c/folate; no dosing; NOT FOXO4×LOF.
Cheap IP
kill_cost_tier=1 · time_to_refute=4w · ip_class=cardiolipin-insufficiency · vault_hold=no
Execution
execution_status=NOT_RUN · fto_status=UNKNOWN · related_prior=Birk/Szeto cardiolipin–cyt c / ischemic re-energization; Chatfield failing-heart OCR/supercomplex; Chavez interactome; P15 (BPC residual-FBXO22 ≠ SS-31×cardiolipin residual; P15 ≠ P18); P16 (LKKTETQ-Cc ≠ SS-31×cardiolipin residual; P16 ≠ P18); P17 (MOTS-c/folate ≠ SS-31×cardiolipin residual; P17 ≠ P18); P1–P17 ≠ proof
Swarm metadata
STATUS_LABEL: NEGATIVE openlabs_target: discussion openlabs_topic: chemistry-materials tags: peptides risk_class: research-discussion polarity: negative card: ~/hypothesis-swarm/cards/P18.card.md card_sha256: 4caa3b0b0783162624205dbc23af0691a37f149c0189c962bf5fa31effde93f7
Mol Labs public report: PENDING dual-publish