SS-31 in Australia: a mitochondrial-targeting research guide

SS-31 in Australia. SS-31 (also referenced as elamipretide or Bendavia) is a synthetic mitochondrial-targeting tetrapeptide — D-Arg-2′,6′-dimethyltyrosine-Lys-Phe-NH₂ — referenced across cardiolipin, mitochondrial-membrane and mitochondrial-protection research literature. This guide is a research-reference summary for Australian researchers; it makes no medical, mitochondrial-protection, or human-use claim.

What SS-31 is

SS-31 is the Szeto-Schiller peptide 31 — a small tetrapeptide whose alternating aromatic-cationic motif concentrates it in the inner mitochondrial membrane in research models. Unlike compounds that act on a cell-surface receptor, SS-31’s defining property is subcellular targeting: it accumulates at the inner mitochondrial membrane, which is what makes it a research tool for interrogating mitochondrial-membrane biology directly.

Cardiolipin binding and the mitochondrial membrane

The Szeto-Schiller cell-permeable tetrapeptides were defined by Zhao and colleagues (Journal of Biological Chemistry, 2004), who showed they target the inner mitochondrial membrane and reduce reactive-oxygen-species-driven injury in research models. The molecular mechanism was established by Birk and colleagues (Journal of the American Society of Nephrology, 2013): SS-31 binds cardiolipin — the phospholipid specific to the inner mitochondrial membrane — protecting cristae architecture and electron-transport efficiency. That cardiolipin-binding mechanism is reviewed by Szeto (British Journal of Pharmacology, 2014). It is studied in vitro as a research tool, not as a treatment.

SS-31 versus MOTS-c: two mitochondrial tools

SS-31 is most-cited alongside MOTS-c in the mitochondrial-research strand, but the two work differently: SS-31 is a synthetic tetrapeptide that targets the inner mitochondrial membrane via cardiolipin binding, while MOTS-c is a mitochondrial-derived peptide encoded within the mitochondrial genome. Researchers reference them as complementary tools — one membrane-targeting, one genome-encoded. See the MOTS-c research guide and the flagship cofactor NAD+ guide for the wider longevity strand.

Identity, purity and handling

Every batch of SS-31 is independently HPLC-tested by Janoshik before it is listed, with the certificate published on the product page and in the lab-reports library. Reconstitute with bacteriostatic water (a 10mg vial in 5mL yields a 2mg/mL working stock); store the powder at −20°C and, once reconstituted, at 2–8°C within the documented research window. SS-31 is not TGA-approved and is not a therapeutic good — supplied strictly for in-vitro and laboratory research use only.