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- W2002258995 abstract "1. alpha1-Antitrypsin contains a single thiol group partly blocked in native plasma and reactive after mild reduction. 2. Human alpha1-antitrypsins of Pi types F, M, S and Z have been isolated with native microheterogeneity using thiol-disulfide (SH-SS) interchange reactions utilizing the reactive thiol group. 3. The pI of the various microheterogeneous fractions are given for protein M. Stepwise desialylation of alpha1-antitrypsin indicates that the charge difference between the major fractions is one sialic acid residue between each. This is further supported by the pI changes obtained on substitution of the single thiol with positively or negatively charged compounds. 4. Desialyation of purified proteins from each Pi type converts the individual microheterogeneous fractions to one major fraction. The pI shift for the variants studied indicate a difference of plus or minus one or two charge units between protein M and the variants. 5. A difference of one sialic acid residue was obtained for proteins M and Z by the thiobarbituric assay, but stepwise removal of sialic acid with neuraminidase revealed almost identical stepwise change of pattern of both proteins indicating the same number of sialic acid residues. 6. Electrofocusing has been used to identify CNBr fragments from proteins M, S and Z. 7. An amino acid substitution has been found to be located in one of the eight CNBr fragments, glutamic acid in protein M is substituted by lysine in protein Z. 8. The average concentration of alpha1-antityprsin in plasma from healthy males was found to be 1.32 g/1." @default.
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- W2002258995 date "1978-02-01" @default.
- W2002258995 modified "2023-10-16" @default.
- W2002258995 title "Properties of Isolated Human alpha1-Antitrypsins of Pi Types M, S and Z" @default.
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- W2002258995 doi "https://doi.org/10.1111/j.1432-1033.1978.tb12078.x" @default.
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