[TTHY_HUMAN] Defects in TTR are the cause of amyloidosis transthyretin-related (AMYL-TTR) [MIM:105210]. A hereditary generalized amyloidosis due to transthyretin amyloid deposition. Protein fibrils can form in different tissues leading to amyloid polyneuropathies, amyloidotic cardiomyopathy, carpal tunnel syndrome, systemic senile amyloidosis. The disease includes leptomeningeal amyloidosis that is characterized by primary involvement of the central nervous system. Neuropathologic examination shows amyloid in the walls of leptomeningeal vessels, in pia arachnoid, and subpial deposits. Some patients also develop vitreous amyloid deposition that leads to visual impairment (oculoleptomeningeal amyloidosis). Clinical features include seizures, stroke-like episodes, dementia, psychomotor deterioration, variable amyloid deposition in the vitreous humor.[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] Defects in TTR are a cause of hyperthyroxinemia dystransthyretinemic euthyroidal (HTDE) [MIM:145680]. It is a condition characterized by elevation of total and free thyroxine in healthy, euthyroid persons without detectable binding protein abnormalities.[73] Defects in TTR are a cause of carpal tunnel syndrome type 1 (CTS1) [MIM:115430]. It is a condition characterized by entrapment of the median nerve within the carpal tunnel. Symptoms include burning pain and paresthesias involving the ventral surface of the hand and fingers which may radiate proximally. Impairment of sensation in the distribution of the median nerve and thenar muscle atrophy may occur. This condition may be associated with repetitive occupational trauma, wrist injuries, amyloid neuropathies, rheumatoid arthritis.[74]
Function
[TTHY_HUMAN] Thyroid hormone-binding protein. Probably transports thyroxine from the bloodstream to the brain.[75]
Evolutionary Conservation
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Publication Abstract from PubMed
Transthyretin (TTR) is a soluble human plasma protein that can be converted into amyloid by acid-mediated dissociation of the homotetramer into monomers. The pH required for disassembly also results in tertiary structural changes within the monomeric subunits. To understand whether these tertiary structural changes are required for amyloidogenicity, we created the Phe87Met/Leu110Met TTR variant (M-TTR) that is monomeric according to analytical ultracentrifugation and gel filtration analyses and nonamyloidogenic at neutral pH. Results from far- and near-UV circular dichroism spectroscopy, one-dimensional proton NMR spectroscopy, and X-ray crystallography, as well as the ability of M-TTR to form a complex with retinol binding protein, indicate that M-TTR forms a tertiary structure at pH 7 that is very similar if not identical to that found within the tetramer. Reducing the pH results in tertiary structural changes within the M-TTR monomer, rendering it amyloidogenic, demonstrating the requirement for partial denaturation. M-TTR exhibits stability toward acid and urea denaturation that is nearly identical to that characterizing wild-type (WT) TTR at low concentrations (0.01-0.1 mg/mL), where monomeric WT TTR is significantly populated at intermediate urea concentrations prior to the tertiary structural transition. However, the kinetics of denaturation and fibril formation are much faster for M-TTR than for tetrameric WT TTR, particularly at near-physiological concentrations, because of the barrier associated with the tetramer to folded monomer preequilibrium. These results demonstrate that the tetramer to folded monomer transition is insufficient for fibril formation; further tertiary structural changes within the monomer are required.
An engineered transthyretin monomer that is nonamyloidogenic, unless it is partially denatured.,Jiang X, Smith CS, Petrassi HM, Hammarstrom P, White JT, Sacchettini JC, Kelly JW Biochemistry. 2001 Sep 25;40(38):11442-52. PMID:11560492[76]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
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↑Jiang X, Smith CS, Petrassi HM, Hammarstrom P, White JT, Sacchettini JC, Kelly JW. An engineered transthyretin monomer that is nonamyloidogenic, unless it is partially denatured. Biochemistry. 2001 Sep 25;40(38):11442-52. PMID:11560492
