Abstract

The amino acid sequence of the human lysosomal alpha-mannosidase precursor has been deduced by PCR mediated cloning and sequencing of the cDNA. The protein has 961 amino acids and a molecular weight of 107,644 Daltons. The amino acid sequence shows 38% identity to the Dictyostelium discoideum lysosomal alpha-mannosidase. The cDNA maps proximal to the centromere on chromosome 19q, the same locus as the MANB gene. Our results provide valuable information for the study of the lysosomal storage disease alpha-mannosidosis, an inherited disorder caused by mutations in the MANB gene which encodes the human lysosomal alpha-mannosidase.

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