Title : Aberrant disulphide bonding contributes to the ER retention of alpha1-antitrypsin deficiency variants.

Pub. Date : 2016 Feb 15

PMID : 26647313






5 Functional Relationships(s)
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1 Aberrant disulphide bonding contributes to the ER retention of alpha1-antitrypsin deficiency variants. disulphide serine (or cysteine) preptidase inhibitor, clade A, member 1B Mus musculus
2 We show in Hepa1.6 cells that the mildly polymerogenic I (Arg39Cys) AAT mutant forms aberrant inter- and intra-molecular disulphide bonds involving the acquired Cys39 and the only cysteine residue in the wild-type (M) sequence (Cys232). disulphide serine (or cysteine) preptidase inhibitor, clade A, member 1B Mus musculus
3 Substitution of Cys39 to serine partially restores secretion, showing that disulphide bonding contributes to the intracellular retention of I AAT. disulphide serine (or cysteine) preptidase inhibitor, clade A, member 1B Mus musculus
4 Prevention of such disulphide linkage through the introduction of the Cys232Ser mutation or by treatment of cells with reducing agents increases Z AAT secretion. disulphide serine (or cysteine) preptidase inhibitor, clade A, member 1B Mus musculus
5 Our results reveal that disulphide interactions enhance intracellular accumulation of AAT mutants and implicate the oxidative ER state as a pathogenic co-factor. disulphide serine (or cysteine) preptidase inhibitor, clade A, member 1B Mus musculus