Abstract
The founder of the MiAMP1 protein family was originally isolated from Macadamia integrifolia and had antimicrobial activity in vitro. MiAMP1 was the first plant protein with a structure containing a βγ-crystallin precursor fold, a structural superfamily associated with antimicrobial proteins in other kingdoms. In recent times, expanding plant genomics information has revealed that genes encoding homologues of MiAMP1 are conserved across the plant kingdom from lycophytes, gymnosperms to early angiosperms (e.g. Amborella, Papaver) and some monocots (e.g. Zantedeschia, Zea, Sorghum). Many studies of plant–pathogen interactions in gymnosperms have demonstrated a potential role for MiAMP1 family members in defence against fungal pathogens. This commentary describes the discovery and diversity of this protein family and considers current evidence supporting, and future opportunities for substantiating, a role in defence in primitive plants, and why this role may have diminished in higher plants.
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