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The IMiD target CRBN determines HSP90 activity toward transmembrane proteins essential in multiple myeloma

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Item Type:Article
Title:The IMiD target CRBN determines HSP90 activity toward transmembrane proteins essential in multiple myeloma
Creators Name:Heider, M. and Eichner, R. and Stroh, J. and Morath, V. and Kuisl, A. and Zecha, J. and Lawatscheck, J. and Baek, K. and Garz, A.K. and Rudelius, M. and Deuschle, F.C. and Keller, U. and Lemeer, S. and Verbeek, M. and Götze, K.S. and Skerra, A. and Weber, W.A. and Buchner, J. and Schulman, B.A. and Kuster, B. and Fernández-Sáiz, V. and Bassermann, F.
Abstract:The complex architecture of transmembrane proteins requires quality control (QC) of folding, membrane positioning, and trafficking as prerequisites for cellular homeostasis and intercellular communication. However, it has remained unclear whether transmembrane protein-specific QC hubs exist. Here we identify cereblon (CRBN), the target of immunomodulatory drugs (IMiDs), as a co-chaperone that specifically determines chaperone activity of HSP90 toward transmembrane proteins by means of counteracting AHA1. This function is abrogated by IMiDs, which disrupt the interaction of CRBN with HSP90. Among the multiple transmembrane protein clients of CRBN-AHA1-HSP90 revealed by cell surface proteomics, we identify the amino acid transporter LAT1/CD98hc as a determinant of IMiD activity in multiple myeloma (MM) and present an Anticalin-based CD98hc radiopharmaceutical for MM radio-theranostics. These data establish the CRBN-AHA1-HSP90 axis in the biogenesis of transmembrane proteins, link IMiD activity to tumor metabolism, and nominate CD98hc and LAT1 as attractive diagnostic and therapeutic targets in MM.
Keywords:Chaperones, IMiDs, Ubiquitin, HSP90, Multiple Myeloma, CD98hc, LAT1, Radio-Theranostics, Protein Quality Control, CRBN, Animals, Mice
Source:Molecular Cell
ISSN:1097-2765
Publisher:Cell Press
Volume:81
Number:6
Page Range:1170-1186
Date:18 March 2021
Official Publication:https://doi.org/10.1016/j.molcel.2020.12.046
PubMed:View item in PubMed

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