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Separation by hybrid isoelectric focusing of normal human plasma transthyretin (prealbumin) and a variant with a methionine for valine substitution associated with familial amyloidotic polyneuropathy
Author(s) -
Altland Klaus,
Banzhoff Angelika
Publication year - 1986
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.1150071110
Subject(s) - transthyretin , isoelectric focusing , valine , chemistry , histidine , polyneuropathy , methionine , biochemistry , polyacrylamide gel electrophoresis , amino acid , chromatography , gel electrophoresis , isoelectric point , biology , medicine , endocrinology , enzyme
The human plasma transthyretin (TTR, prealbumin) variant TTR(Met 30 ) has been separated from normal TTR(Val 30 ) by double one‐dimensional electrophoresis using polyacrylamide gel electrophoresis followed by hybrid isoelectric focusing. The procedure appears to be appropriate for identification by the screening of patients with familial amyloidotic polyneuropathy of Portuguese type I. This is the second example to support the recently expressed hypothesis (Altland et al., Electrophoresis 1986, 7 , 251–259) that substitutions of electrically neutral amino acids ( e. g. methionine for valine at position 30) in a polypeptide chain ( e. g. the TTR monomer) may be detected by isoelectric focusing under denaturing conditions ( e. g. hybrid isoelectric focusing in the presence of 8 M urea, 50 mM dithiothreitol) when the exchange is close to a charged amino acid ( e. g. histidine at position 31, p I (TTR) = 5.7, p K a (His) = 6.0).