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• W2116747926 abstract "Mutants of the human plasma transthyretin (TTR, prealbumin) have attracted interest due to their rather frequent association with the autosomal dominant disease familial amyloidotic polyneuropathy (FAP). Some three quarters of known TTR mutations produce electrically neutral amino acid substitutions undetectable via separation by charge. We have developed an electrophoretic procedure sensitive to differences in the stability of tetramers and monomers under partially denaturing conditions. The differential folding states were found to be fully reversible. Applying the procedure we found 14 electrically silent mutants of TTR among 2 000 plasma samples from German donors. We demonstrate that the normal TTR monomer exists in different forms of variable stability and/or charge due to binding of sulfhydryls from plasma to the unique cysteine at position 10 of the primary structure as well as due to modification by treatment with an oxidant. We found that reduction of Cys10 increases the stability of the folded monomeric and tetrameric conformations. The conformational changes of TTR induced by isoelectric focusing in a urea gradient were found to be associated by a gain of three positive charge units. Using published crystallographic data we present structural sites in the TTR molecule which could explain the observed effects." @default.
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• W2116747926 date "1999-06-01" @default.
• W2116747926 modified "2023-09-29" @default.
• W2116747926 title "Electrically neutral microheterogeneity of human plasma transthyretin (prealbumin) detected by isoelectric focusing in urea gradients" @default.
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• W2116747926 doi "https://doi.org/10.1002/(sici)1522-2683(19990601)20:7<1349::aid-elps1349>3.0.co;2-5" @default.
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