Regenerative · Histidine-rich salivary phosphopeptide
Histatin-1
Also known as Hst1; HTN1
A 38-residue salivary phosphopeptide studied for cell migration, epithelial organisation and interactions with mineral surfaces.
- Length
- 38 amino acids
- Half-life
- Not well characterised
- Mechanism
- Histatin-1 promotes cell migration and spreading in experimental systems, with ERK-associated signalling and cellular uptake implicated in these responses. A single, universally accepted receptor has not been established; antimicrobial and surface-binding activities depend on the experimental environment.
- Studied in
- Epithelial and endothelial cell cultures, scratch assays and mineral-binding models are used to investigate migration, barrier organisation and adsorption to oral surfaces.
About Histatin-1
Histatin-1 belongs to the histidine-rich peptide family isolated and characterised from human saliva in the late twentieth century. The mature peptide contains 38 amino acids and is encoded by HTN1. Its sequence is DSHEKRHHGYRRKFHEKHHSHREFPFYGDYGSNYLYDN, with native phosphorylation at serine 2. This phosphate group contributes to interactions with calcium-containing mineral surfaces, making phosphorylation status an important distinction between native material and otherwise sequence-matched synthetic preparations used in laboratory comparisons.
Research on Histatin-1 extends beyond the antimicrobial properties originally associated with histatins. Cultured epithelial and endothelial cells provide models for investigating cell spreading, migration and junctional organisation. ERK signalling, intracellular localisation and interactions with cellular membranes have been implicated, although the initiating molecular interactions remain incompletely resolved. Scratch closure should not be interpreted as migration alone without controlling for proliferation, and results from Histatin-3 or Histatin-5 should not automatically be attributed to Histatin-1.
Laboratory notes
- Confirm whether the preparation contains phosphoserine at position 2; an unphosphorylated analogue is not chemically identical to native Histatin-1.
- Record buffer pH, ionic strength and divalent-metal content because these influence histidine protonation and surface interactions.
- Pair scratch assays with viability and proliferation controls, and verify peptide integrity after incubation in protease-containing media.
Storage and reconstitution basics: storage guide.
Questions about Histatin-1
Is synthetic Histatin-1 always phosphorylated?
No. Some preparations contain ordinary serine at position 2. The sequence specification and mass-spectrometric characterisation should explicitly identify the modification.
Does Histatin-1 have an established receptor?
No single receptor explains all reported activities. ERK-associated signalling and cellular uptake are experimental findings rather than proof of one exclusive receptor pathway.
Can Histatin-5 serve as an interchangeable assay standard?
No. Histatin-5 differs in sequence, length and activity profile, particularly in fungal models. It can be a comparator, but not an identity-matched standard.
Is Histatin-1 for human use?
No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.
Related research peptides
All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.