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FEBS Lett. 1990 Oct 29;273(1-2):87-90.

Antithrombin Dublin (-3 Val----Glu): an N-terminal variant which has an aberrant signal peptidase cleavage site.

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  • 1Department of Haematology, MRC Centre, Cambridge, UK.


Antithrombin Dublin is an electrophoretically fast variant of antithrombin which has normal heparin affinity. Direct sequencing of amplified exon 2 revealed a Val----Glu substitution at position -3. N-terminal sequencing of antithrombin from two individuals, heterozygous for the Dublin mutation, showed the presence of a truncated antithrombin in which the N-terminal dipeptide is absent. We propose that the prepeptide mutation redirects signal peptidase cleavage to a site two amino acids downstream into the mature protein.

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