This family represents a region near the C terminus of Mid2, which contains a transmembrane region. The remainder of the protein sequence is serine-rich and of low complexity, and is therefore impossible to align accurately. Mid2 is thought to act as a mechanosensor of cell wall stress. The C-terminal cytoplasmic region of Mid2 is known to interact with Rom2, a guanine nucleotide exchange factor (GEF) for Rho1, which is part of the cell wall integrity signalling pathway []1.

1: Wsc1 and Mid2 are cell surface sensors for cell wall integrity signaling that act through Rom2, a guanine nucleotide exchange factor for Rho1. Philip B, Levin DE; Mol Cell Biol 2001;21:271-280. PMID:11113201