Stress Induced Phosphoprotein 1 (STIP1)

Hop is the Hsp70-Hsp90 organizing protein. It functions as a co-chaperone which reversibly links together the protein chaperones Hsp70 and Hsp90.The gene for human Hop is located on chromosome 11q13.1 and consists of 14 exons.

HOP (the abbreviation stands for Hsp70/Hsp90 Organizing Protein) belongs to the large group of co-chaperones, which regulate and assist the major chaperones (mainly heat shock proteins). It is one of the best studied co-chaperones of the Hsp70/Hsp90-complex. It was first discovered in yeast and homologues were identified in human, mouse, rat, insects, plants, parasites, and virus. The family of these proteins is referred to as STI1 (stress inducible protein) and can be divided into yeast, plant, and animal STI1 (Hop).