Spectroscopic analysis of amyloid fibril formation in SH3‐domains

Article type: Research Article

Authors: Ventura, Salvador | Serrano, Luis

Affiliations: European Molecular Biology Laboratory, Meyerhofstrasse 1, D‐69117 Heidelberg, Germany

Note: [] Corresponding author. Tel.: + 34 93 581 21 54; Fax: + 34 93 581 12 64; E‐mail: [email protected].

Abstract: The aggregation of proteins in fibrillar form is a problem of critical importance in a wide range of abnormal disease states. To decipher the molecular mechanism of formation of protein fibrillar aggregates we have chosen to study as model SH3 domains that exhibit different abilities to polymerize into amyloid fibrils. While being not related to any known disease, the SH3 domain of the p85α subunit of phosphatidylinositol 3 kinase has been found to form amyloid fibrils in vitro under acidic conditions, meanwhile, we have found that the spectrin SH3‐domain, sharing the same fold and some sequential identity keeps its native conformation under the same conditions. The use of spectroscopic methods to study these properties is illustrated in the present job, and correlated to direct sample observation by electron microscopy.

Keywords: Amyloid formation, UV, fluorescence, circular dichroism, SH3 domain

Journal: Spectroscopy, vol. 17, no. 4, pp. 647-652, 2003