Inp1 is a family of peripheral membrane proteins of peroxisomes. Inp1p binds Pex25p, Pex30p, and Vps1p, all of which are involved in controlling peroxisome division. The levels of Inp1p vary with the cell cycle, and Inp1 acts as a factor that retains peroxisomes in cells and controls peroxisome division [1]. Inp1p promotes the retention of peroxisomes in mother cells and buds of budding yeast by attaching peroxisomes to as-yet-unidentified cortical structures [2].

1: Inp1p is a peroxisomal membrane protein required for peroxisome inheritance in Saccharomyces cerevisiae. Fagarasanu M, Fagarasanu A, Tam YY, Aitchison JD, Rachubinski RA; J Cell Biol. 2005;169:765-775. PMID:15928207

2: Maintaining peroxisome populations: a story of division and inheritance. Fagarasanu A, Fagarasanu M, Rachubinski RA; Annu Rev Cell Dev Biol. 2007;23:321-344. PMID:17506702