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Thymosin Alpha-1: Compound Profile

Thymosin Alpha-1 is one of the most heavily referenced thymic peptides in immunology research, and it is unusual among catalog peptides in that its mechanism is framed around innate-immune pattern-recognition receptors rather than a single hormone receptor. This profile covers what the peptide is relative to its parent protein, the immune-signaling pathways the literature attributes to it, and how it is handled in the laboratory. The framing throughout is preclinical: cell cultures and animal models, not people.

What is Thymosin Alpha-1?#

Thymosin Alpha-1 is a synthetic linear peptide of 28 amino acids with an acetylated N-terminus, written Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN. Its sequence corresponds to the N-terminal region of prothymosin alpha, a 111-residue acidic nuclear protein encoded by the PTMA gene, from which the shorter thymic peptide is derived by proteolytic processing. In research catalogs the compound also appears under the names thymalfasin and Tα1. Because the peptide is a single defined sequence rather than a variable fragment, its molecular identity is clean to pin down: one chemical formula, one registered structure record, listed below.

AttributeValue
Common nameThymosin Alpha-1 (thymalfasin, Tα1)
ClassSynthetic 28-residue, N-terminally acetylated thymic peptide
SequenceAc-SDAAVDTSSEITTKDLKEKKEVVEEAEN
Length28 amino acids
Parent proteinProthymosin alpha — UniProt P06454, gene PTMA (111 residues)
Molecular formulaC₁₂₉H₂₁₅N₃₃O₅₅
Approximate molecular weight~3108 Da
PubChem CID16130571
Reported study focusToll-like-receptor engagement; dendritic-cell and T-cell signaling
Thymosin Alpha-1 identity, anchored on its parent protein prothymosin alpha (UniProt P06454) and its registered chemical record.
Thymosin alpha-1 2D molecular structure. Surgical-green heteroatoms (N, O, S) over a white skeleton on a dark background.
Thymosin alpha-1 · structure rendered from PubChem CID 16130571 via RDKit.

What does the research literature study?#

The Thymosin Alpha-1 literature concentrates on innate-immune pattern-recognition signaling. A recurring thread places the peptide as a ligand or modulator of Toll-like receptors on antigen-presenting cells: work on dendritic cells, PMID 42295795, for example, examined the peptide chaperoning a microRNA ligand of TLR7 as a route to altered dendritic-cell signaling. A second thread characterizes its action across defined immune-cell populations rather than a single readout: an immunomodulatory-activity study, PMID 40955371 profiled the peptide against distinct immune-cell subsets and cell lines in culture, and an in-vitro model against human cytomegalovirus, PMID 38396631 placed it in a controlled infection-signaling assay alongside carbosilane dendrimers. Reviews frame the peptide as a mechanistic problem worth dissecting on its own terms: a phenotypic-discovery review, PMID 38903817 argues for studying Tα1 through phenotype-first mechanism rather than a single target, and an aging-and-immunity review, PMID 41373628 situates it among thymic peptides studied for immune-cell maturation. Across all of this, the recurring subject is a peptide investigated for how it shifts immune-signaling pathways in cell and animal models. None of this work demonstrates outcomes in humans.

Where Thymosin Alpha-1 sits among thymic immune peptides#

Most catalog peptides are studied as agonists of a named hormone receptor. Thymosin Alpha-1 is a contrast case: it is investigated as a modulator of innate-immune pattern-recognition signaling, upstream of the adaptive response, which is why the literature returns to Toll-like receptors and antigen-presenting cells rather than a single ligand-receptor pair. That places it apart from the structural thymic-peptide fragment TB-500, which descends from thymosin β4 and is studied for actin-cytoskeleton regulation rather than immune signaling — a useful reminder that the shared "thymosin" name spans unrelated mechanisms. Nexara stocks Thymosin Alpha-1 as a single-compound research peptide rather than as part of a multi-peptide blend, reflecting how it is investigated in the literature: on its own, against immune-signaling readouts.

Handling and storage#

Thymosin Alpha-1 is supplied as a white to off-white lyophilized powder and dissolved prior to use. As a highly acidic, glutamate-and-aspartate-rich peptide it is handled the same way as the rest of the catalog: the reconstitution primer covers solvent selection and avoiding aggregation, while the cold-chain article covers how stability changes once the powder is in solution. The lyophilized form is best kept cold and protected from light, with freeze-thaw cycles minimized once reconstituted.

Nexara stocks Thymosin Alpha-1 at ≥99% purity for laboratory research. Independent third-party COA delivery is paused during the transition to a new testing laboratory; see research compliance for the current posture, and quality standards for the handling baseline.

Frequently asked

What is Thymosin Alpha-1?
Thymosin Alpha-1 is a synthetic 28-amino-acid, N-terminally acetylated peptide corresponding to a cleavage fragment of the protein prothymosin alpha (UniProt P06454). Research studies it for Toll-like-receptor engagement and immune-cell signaling in cell and animal models. It is a laboratory research compound and is not for human use.
What does the research on Thymosin Alpha-1 study?
The literature focuses on innate-immune pattern-recognition signaling: how the peptide engages Toll-like receptors, activates dendritic cells, and shifts responses across distinct immune-cell subsets in culture. This work is preclinical, conducted in cell and animal models, and does not demonstrate outcomes in people.
Is Thymosin Alpha-1 related to TB-500?
Only by name. Both carry the "thymosin" label, but TB-500 is derived from thymosin β4 and is studied for actin-cytoskeleton regulation, whereas Thymosin Alpha-1 is derived from prothymosin alpha and is studied for immune-signaling pathways. They are structurally and mechanistically unrelated research subjects.

Sources and further reading#

For research use only. Not for human consumption, diagnosis, treatment, or prevention of any disease. All products are intended solely for laboratory research purposes.

Last updated: 2026-08-17