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Chapter category: Chaperones

Functions of the Hsp90-Binding FKBP Immunophilins

This chapter appears in the following book:

Networking of Chaperones
by Co-Chaperones

Edited by: Gregory L. Blatch
ISBN: 978-0-387-49308-4
» Get more information about this book at landesbioscience.com «

Chapter authors:
Marc B. Cox and David F. Smith


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Hsp90 functionally interacts with a broad array of client proteins, but in every case examined Hsp90 is accompanied by one or more cochaperones. One class of cochaperone contains a tetratricopeptide repeat domain that targets the cochaperone to the C-terminal region of Hsp90. Within this class are Hsp90-binding peptidylprolyl isomerases, most of which belong to the FK506-binding protein (FKBP) family. Despite the common association of FKBP cochaperones with Hsp90, it is now clear that the client protein influences, and is influenced by, the particular FKBP bound to Hsp90. Examples include Xap2 in aryl hydrocarbon receptor complexes and FKBP52 in steroid receptor complexes. In this chapter, we discuss the known functional roles played by FKBP cochaperones and, where possible, relate distinctive functions to structural differences between FKBP members.

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