Medical College of Wisconsin
CTSICores SearchResearch InformaticsREDCap

Altered dimer interface decreases stability in an amyloidogenic protein. J Biol Chem 2008 Jun 06;283(23):15853-60

Date

04/11/2008

Pubmed ID

18400753

Pubmed Central ID

PMC2414275

DOI

10.1074/jbc.M705347200

Scopus ID

2-s2.0-47049120015   76 Citations

Abstract

Amyloidoses are devastating and currently incurable diseases in which the process of amyloid formation causes fatal cellular and organ damage. The molecular mechanisms underlying amyloidoses are not well known. In this study, we address the structural basis of immunoglobulin light chain amyloidosis, which results from deposition of light chains produced by clonal plasma cells. We compare light chain amyloidosis protein AL-09 to its wild-type counterpart, the kappaI O18/O8 light chain germline. Crystallographic studies indicate that both proteins form dimers. However, AL-09 has an altered dimer interface that is rotated 90 degrees from the kappaI O18/O8 dimer interface. The three non-conservative mutations in AL-09 are located within the dimer interface, consistent with their role in the decreased stability of this amyloidogenic protein. Moreover, AL-09 forms amyloid fibrils more quickly than kappaI O18/O8 in vitro. These results support the notion that the increased stability of the monomer and delayed fibril formation, together with a properly formed dimer, may be protective against amyloidogenesis. This could open a new direction into rational drug design for amyloidogenic proteins.

Author List

Baden EM, Owen BA, Peterson FC, Volkman BF, Ramirez-Alvarado M, Thompson JR

Authors

Francis C. Peterson PhD Professor in the Biochemistry department at Medical College of Wisconsin
Brian F. Volkman PhD Professor in the Biochemistry department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Amyloid
Amyloidosis
Dimerization
Drug Design
Humans
Immunoglobulin kappa-Chains
Mutation
Plasma Cells
Protein Structure, Quaternary
jenkins-FCD Prod-444 eb4ebd1a08581aba961d3befd3b851a3c3ec6b46