What is "prohibitin"

n. (context protein English) A protein, found in almost all living things, thought to have multiple functions

Prohibitin, also known as PHB, is a protein that in humans is encoded by the PHB gene. The Phb gene has also been described in animals, fungi, plants, and unicellular eukaryotes. Prohibitins are divided in two classes, termed Type-I and Type-II prohibitins, based on their similarity to yeast PHB1 and PHB2, respectively. Each organism has at least one copy of each type of prohibitin gene.