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  • Title: Purification of acid sphingomyelinase from human placenta: characterization and N-terminal sequence.
    Author: Lansmann S, Ferlinz K, Hurwitz R, Bartelsen O, Glombitza G, Sandhoff K.
    Journal: FEBS Lett; 1996 Dec 16; 399(3):227-31. PubMed ID: 8985151.
    Abstract:
    Human placental acid sphingomyelinase (ASM) was purified by sequential chromatography on Con A-Sepharose, octyl-Sepharose and Matrex gel red A. Final purification to apparent homogeneity was achieved by immunoaffinity chromatography employing polyclonal anti-ASM antibodies. The antibodies also allowed specific detection of ASM by Western blotting at various stages of purification. The ASM activity was enriched about 110,000-fold over that of the crude extract, yielding an enzyme preparation with a specific activity of about 1 mmol/h per mg protein in a detergent-containing assay system. Analysis of the final preparation by SDS-PAGE resulted in a single protein band with a molecular mass of approximately 75 kDa, which was reduced to approximately 60 kDa after complete deglycosylation. Microsequencing of the purified ASM revealed the N-terminal amino acid sequence of the mature placental enzyme.
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