Research Comparison
Glutathione vs SS-31
A side-by-side research comparison of Glutathione and SS-31 drawn from DRPSHP' peptide database records.
Glutathione
Glutathione is the cell's workhorse thiol. It consists of glutamate, cysteine and glycine, with the unusual feature that glutamate joins through its side-chain gamma carboxyl rather than the usual alpha group. Cells assemble it in two ATP-driven steps using glutamate-cysteine ligase and glutathione synthetase. It exists as reduced GSH and as the oxidised disulfide GSSG, and the balance between the two is a standard readout of cellular redox status. What happens inside cells is thoroughly charted. Experiments delivering glutathione from outside, in animals or humans, are harder to read because it is rapidly degraded in the extracellular space and the human results disagree.
SS-31
SS-31, known clinically as elamipretide, is a four-residue peptide built to home in on mitochondria. Its sequence is D-Arg-Dmt-Lys-Phe-NH2, where Dmt stands for 2',6'-dimethyltyrosine. A D-amino acid at the front resists enzymatic breakdown, and at neutral pH the molecule has a net charge of +3. The SS label honours Szeto and Schiller, whose group derived a family of such peptides from opioid chemistry, although SS-31 itself is described as lacking opioid activity. Mechanistic work mostly uses isolated mitochondria, cell lines and rodent models of ischaemia. Human trials exist, particularly in inherited mitochondrial disease, but they are smaller and less uniform than the preclinical data.
Reading a comparison
A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.