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2017 ; 7
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Functional Amyloid Protection in the Eye Lens: Retention of ?-Crystallin
Molecular Chaperone Activity after Modification into Amyloid Fibrils
#MMPMID28895938
Garvey M
; Ecroyd H
; Ray NJ
; Gerrard JA
; Carver JA
Biomolecules
2017[Sep]; 7
(3
): ä PMID28895938
show ga
Amyloid fibril formation occurs from a wide range of peptides and proteins and is
typically associated with a loss of protein function and/or a gain of toxic
function, as the native structure of the protein undergoes major alteration to
form a cross ?-sheet array. It is now well recognised that some amyloid fibrils
have a biological function, which has led to increased interest in the potential
that these so-called functional amyloids may either retain the function of the
native protein, or gain function upon adopting a fibrillar structure. Herein, we
investigate the molecular chaperone ability of ?-crystallin, the predominant eye
lens protein which is composed of two related subunits ?A- and ?B-crystallin, and
its capacity to retain and even enhance its chaperone activity after forming
aggregate structures under conditions of thermal and chemical stress. We
demonstrate that both eye lens ?-crystallin and ?B-crystallin (which is also
found extensively outside the lens) retain, to a significant degree, their
molecular chaperone activity under conditions of structural change, including
after formation into amyloid fibrils and amorphous aggregates. The results can be
related directly to the effects of aging on the structure and chaperone function
of ?-crystallin in the eye lens, particularly its ability to prevent crystallin
protein aggregation and hence lens opacification associated with cataract
formation.
|Amyloid/chemistry/*metabolism
[MESH]
|Animals
[MESH]
|Cattle
[MESH]
|Humans
[MESH]
|Lens, Crystalline
[MESH]
|Molecular Chaperones/chemistry/metabolism
[MESH]
|Protein Aggregates
[MESH]
|Protein Binding
[MESH]
|Protein Folding
[MESH]
|Protein Structure, Tertiary
[MESH]
|Protein Unfolding
[MESH]
|alpha-Crystallin A Chain/*chemistry/*metabolism
[MESH]