The molecular abnormality of albumin Niigata: 269 Asp----Gly.

A slow albumin variant was isolated from the serum of a patient with bisalbuminemia. Reverse-phase peptide mapping revealed a single altered peak when tryptic digests of the normal and variant albumin were compared. After rechromatography and amino acid analysis, a sequence of Tyr-Ile-Cys-Glu-Asn-Gln-Gly-Ser was obtained for the mutant peptide, while a sequence of Tyr-Ile-Cys-Glu-Asn-Gln-Asp-Ser was obtained for the normal peptide. This establishes the mutation as 269 Asp----Gly and the new albumin has been named albumin Niigata.