Stabilization of amyloidogenic immunoglobulin light chains by small molecules
Journal Article
·
· Proceedings of the National Academy of Sciences of the United States of America
- The Scripps Research Inst., La Jolla, CA (United States)
- Univ. of Toronto, ON (Canada)
- Univ. of Pavia (Italy); Foundation Ist. di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo, Pavia, (Italy)
In Ig light-chain (LC) amyloidosis (AL), the unique antibody LC protein that is secreted by monoclonal plasma cells in each patient misfolds and/or aggregates, a process leading to organ degeneration. As a step toward developing treatments for AL patients with substantial cardiac involvement who have difficulty tolerating existing chemotherapy regimens, we introduce small-molecule kinetic stabilizers of the native dimeric structure of full-length LCs, which can slow or stop the amyloidogenicity cascade at its origin. Specifically, a protease-coupled fluorescence polarization-based high-throughput screen was employed to identify small molecules that kinetically stabilize LCs. NMR and X-ray crystallographic data demonstrate that at least one structural family of hits bind at the LC–LC dimerization interface within full-length LCs, utilizing variable-domain residues that are highly conserved in most AL patients. Stopping the amyloidogenesis cascade at the beginning is a proven strategy to ameliorate postmitotic tissue degeneration.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- Canadian Institutes of Health Research (CIHR); George E. Hewitt Foundation for Medical Research; Lita Annenberg Hazen Foundation; National Cancer Institute (NCI); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); Natural Sciences and Engineering Research Council of Canada (NSERC); Office of Research Infrastructure Programs (ORIP); Skaggs Institute for Chemical Biology; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1515308
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 17 Vol. 116; ISSN 0027-8424
- Publisher:
- National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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