Compartment-specific sequestrase chaperone; small heat shock protein (sHSP) with chaperone activity; targets and sequesters proteins to cytoplasmic inclusions (CytoQ);  sumoylated during DNA damage; forms barrel-shaped oligomers that suppress unfolded protein aggregation; involved in cytoskeleton reorganization after heat shock; protein abundance increases and forms cytoplasmic foci in response to DNA replication stress