Histatin 8 is a short histatin, twelve residues in the supplied sequence and under half the mass of histatin 5. It is also catalogued here as the hemagglutination-inhibiting peptide, a name that reflects the activity for which this particular fragment was characterised rather than the antifungal role associated with the family as a whole. Short histatins arise from proteolytic processing of the longer parent peptides in saliva, and the family is a useful illustration that fragments are not simply weaker versions of their precursors. The candidacidal activity of the histatins is concentrated in particular regions, so a fragment may retain one function while losing another, and comparing members of differing length is how those activities are mapped onto sequence. At twelve residues this peptide is short enough to be synthetically convenient and to serve as a starting point for derivative design, which is part of why shorter histatins feature in antimicrobial peptide engineering work. For experiments where potent killing of Candida albicans is the objective, histatin 5 (LT1595) is the better-characterised choice and the one the mechanistic literature is built on. Histatin 8 is appropriate where the question concerns hemagglutination inhibition, where a minimal histatin scaffold is wanted, or where the aim is to establish which region of the parent peptide carries a given activity. | 