Reference : A non-natural variant of human lysozyme (I59T) mimics the in vitro behaviour of the I56T...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/2268/75325
A non-natural variant of human lysozyme (I59T) mimics the in vitro behaviour of the I56T variant that is responsible for a form of familial amyloidosis.
English
Hagan, Christine L [> > > >]
Johnson, Russell J K [> > > >]
Dhulesia, Anne [> > > >]
Dumoulin, Mireille mailto [Université de Liège - ULg > Département des sciences de la vie > Enzymologie et repliement des protéines >]
Dumont, Janice mailto [Université de Liège - ULg > Département des sciences de la vie > Enzymologie et repliement des protéines >]
De Genst, Erwin [> > > >]
Christodoulou, John [> > > >]
Robinson, Carol V [> > > >]
Dobson, Christopher M [> > > >]
Kumita, Janet R [> > > >]
2010
Protein Engineering, Design & Selection
Oxford University Press
23
7
499-506
Yes (verified by ORBi)
International
1741-0126
1741-0134
[en] We report here the detailed characterisation of a non-naturally occurring variant of human lysozyme, I59T, which possesses a destabilising point mutation at the interface of the alpha- and beta-domains. Although more stable in its native structure than the naturally occurring variants that give rise to a familial form of systemic amyloidosis, I59T possesses many attributes that are similar to these disease-associated species. In particular, under physiologically relevant conditions, I59T populates transiently an intermediate in which a region of the structure unfolds cooperatively; this loss of global cooperativity has been suggested to be a critical feature underlying the amyloidogenic nature of the disease-associated lysozyme variants. In the present study, we have utilised this variant to provide direct evidence for the generic nature of the conformational transition that precedes the ready formation of the fibrils responsible for lysozyme-associated amyloid disease. This non-natural variant can be expressed at higher levels than the natural amyloidogenic variants, enabling, for example, singly isotopically labelled protein to be generated much more easily for detailed structural studies by multidimensional NMR spectroscopy. Moreover, we demonstrate that the I59T variant can readily form fibrils in vitro, similar in nature to those of the amyloidogenic I56T variant, under significantly milder conditions than are needed for the wild-type protein.
http://hdl.handle.net/2268/75325
10.1093/protein/gzq023

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