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2015 ; 54
(19
): 2943-56
Nephropedia Template TP
gab.com Text
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English Wikipedia
Fibril Core of Transforming Growth Factor Beta-Induced Protein (TGFBIp)
Facilitates Aggregation of Corneal TGFBIp
#MMPMID25910219
Sørensen CS
; Runager K
; Scavenius C
; Jensen MM
; Nielsen NS
; Christiansen G
; Petersen SV
; Karring H
; Sanggaard KW
; Enghild JJ
Biochemistry
2015[May]; 54
(19
): 2943-56
PMID25910219
show ga
Mutations in the transforming growth factor beta-induced (TGFBI) gene result in a
group of hereditary diseases of the cornea that are collectively known as TGFBI
corneal dystrophies. These mutations translate into amino acid substitutions
mainly within the fourth fasciclin 1 domain (FAS1-4) of the transforming growth
factor beta-induced protein (TGFBIp) and cause either amyloid or nonamyloid
protein aggregates in the anterior and central parts of the cornea, depending on
the mutation. The A546T substitution in TGFBIp causes lattice corneal dystrophy
(LCD), which manifests as amyloid-type aggregates in the corneal stroma. We
previously showed that the A546T substitution renders TGFBIp and the FAS1-4
domain thermodynamically less stable compared with the wild-type (WT) protein,
and the mutant FAS1-4 is prone to amyloid formation in vitro. In the present
study, we identified the core of A546T FAS1-4 amyloid fibrils. Significantly, we
identified the Y571-R588 region of TGFBIp, which we previously found to be
enriched in amyloid deposits in LCD patients. We further found that the Y571-R588
peptide seeded fibrillation of A546T FAS1-4, and, more importantly, we
demonstrated that native TGFBIp aggregates in the presence of fibrils formed by
the core peptide. Collectively, these data suggest an involvement of the
Y571-R588 peptide in LCD pathophysiology.