Amyloid Aggregation of Bacillus circulans Xylanase under Native Conditions and its Modulation by β‐Amyloid‐Derived Peptide Fragments. (16th November 2018)

• Record Type: Journal Article
• Authors: Charlton, Timothy; Shah, Vandan; Lynch, Tonianna; Candreva, Jason; Chau, Edward; Yang, YanXi; Kim, Hyunjoo; Wood, Amy; Kim, Jin Ryoun
• Is Part Of: Chembiochem. Volume 19:Number 24(2018)
• Page Start: 2566
• Page End: 2574
• Publication Date: 2018-11-16
• Subjects: aggregation -- amyloid beta-peptides -- protein engineering -- protein–protein interactions -- xylanase; Biochemistry -- Periodicals; Molecular biology -- Periodicals; Pharmaceutical chemistry -- Periodicals; 572
• DOI: 10.1002/cbic.201800472
• Languages: English
• ISSNs: 1439-4227

Abstract

Abstract: The aggregation of intrinsically disordered proteins into fibrils is implicated in many neurodegenerative diseases. Amyloid aggregation is a generic property of proteins as evidenced by globular proteins that often form amyloid aggregates under partially denaturing conditions. Recently, multiple lines of evidence have suggested that the amyloid aggregation of globular proteins can also occur under native conditions. Unfortunately, amyloid aggregation under native conditions has been demonstrated in only a handful of cases. Engineering a globular protein's amyloid aggregation might benefit from its fusion to an amyloid‐derived fragment with reduced aggregation propensity. Unfortunately, the impacts of such fragments on the amyloid aggregation under native conditions have yet to be examined. In this study, we show that a globular protein, Bacillus circulans xylanase (BCX), can aggregate to form amyloid fibrils under native conditions. When BCX was mixed with or fused to the non‐self‐aggregating fragments, KLVFWAK and ELVFWAE—which were derived from β‐amyloid (Aβ)—they modulated the BCX amyloid aggregation to differing extents. This study also provides insight into a correlation between the kinetic stability and amyloid aggregation of BCX, and supports a view that Aβ‐derived fragments can be useful for the modulating amyloid aggregation of some, though not all, proteins. Abstract : You don′t have to get together : Bacillus circulans xylanase (BCX) can aggregate to form amyloid fibrils under certain native conditions. Such amyloid aggregation decreases BCX′s kinetic stability, but can be altered by fusion or addition of the non‐self‐aggregating fragments, KLVFWAK or ELVFWAE, which were derived from β‐amyloid (Aβ). KLVFWAK also modulates the aggregation of α‐synuclein.