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JOURNAL ARTICLE
REVIEW
Transthyretin amyloidosis: a tale of weak interactions.
FEBS Letters 2001 June 9
Over 70 transthyretin (TTR) mutations have been associated with hereditary amyloidoses, which are all autosomal dominant disorders with adult age of onset. TTR is the main constituent of amyloid that deposits preferentially in peripheral nerve giving rise to familial amyloid polyneuropathy (FAP), or in the heart leading to familial amyloid cardiomyopathy. Since the beginning of this decade the central question of these types of amyloidoses has been why TTR is an amyloidogenic protein with clinically heterogeneous pathogenic consequences. As a result of amino acid substitutions, conformational changes occur in the molecule, leading to weaker subunit interactions of the tetrameric structure as revealed by X-ray studies of some amyloidogenic mutants. Modified soluble tetramers exposing cryptic epitopes seem to circulate in FAP patients as evidenced by antibody probes recognizing specifically TTR amyloid fibrils, but what triggers dissociation into monomeric and oligomeric intermediates of amyloid fibrils is largely unknown. Avoiding tetramer dissociation and disrupting amyloid fibrils are possible avenues of therapeutic intervention based on current molecular knowledge of TTR amyloidogenesis and fibril structure.
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