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• W65212268 abstract "Human acid sphingomyelinase (ASM) hydrolyses sphingomyelin to ceramide and phosphocholine. Metabolic studies on COS-1 cells transfected with ASM cDNA revealed the occurrence of an enzymically inactive precursor which is differentially processed to two predominant native glycoprotein forms: a 70 kDa polypeptide corresponding to human urinary protein and a 57 kDa form. Formation of these potentially active forms was shown to be restricted to distinct compartments. Maturation of the ASM precursor to a predominant 70 kDa form occurs exclusively inside acidic organelles, whereas variable amounts of 57 kDa ASM are detectable immediately after biosynthesis. Metabolic labelling of transfected COS-1 cells with [32P]Pi further suggests that this form obviously does not carry oligomannosylphosphate residues, in contrast with the mature lysosomal ASM. In order to verify that this early form of active ASM results from co-post-translational proteolysis of the ASM precursor and not from the use of different translation-initiation sites on the ASM mRNA, appropriate 5′-mutagenized cDNA constructs were transiently expressed. These results clearly indicate that the first potential in-frame AUG is exclusively used for translation initiation in vivo and that deletion of the proposed signal sequence for endoplasmic reticulum import completely eliminates the ability of the translation product to enter the vacuolar apparatus. As there are two different subcellular sites of maturation of the ASM precursor, and intracellular targeting of the two processed forms appears to be different, the two ASM proteins may contribute to distinct physiological functions." @default.
• W65212268 created "2016-06-24" @default.
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• W65212268 date "1994-08-01" @default.
• W65212268 modified "2023-10-14" @default.
• W65212268 title "Occurrence of two molecular forms of human acid sphingomyelinase" @default.
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• W65212268 doi "https://doi.org/10.1042/bj3010855" @default.
• W65212268 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1137065" @default.
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