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Characterization of two arylsulfatase A missense mutations D335V and T274M causing late infantile metachromatic leukodystrophy
Author(s) -
Hess Barbara,
Kafert Sabine,
Heinisch Uwe,
Wenger David A.,
Zlotogora Joel,
Gieselmann Volkmar
Publication year - 1996
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/(sici)1098-1004(1996)7:4<311::aid-humu4>3.0.co;2-b
Subject(s) - metachromatic leukodystrophy , arylsulfatase a , biology , missense mutation , arylsulfatase , mutant , microbiology and biotechnology , mutation , enzyme , biochemistry , genetics , gene
Metachromatic leukodystrophy is a lysosomal storage disorder caused by the deficiency of arylsulfatase A. We describe a novel missense mutation in exon 6 causing the substitution of Asp335 by Val. In transient transfections no enzyme activity could be expressed from the arylsulfatase A cDNA carrying this mutation. Examination of the effects of the mutation in cells stably overexpressing the mutant enzyme revealed, that the mutant enzyme is catalytically inactive and degraded in an early biosynthetic compartment. We have also investigated the effects of a previously identified mutation (T274M). The specific catalytic activity of the Met274 substituted arylsulfatase is reduced to about 35% of the normal enzyme when measured with an artificial substrate. Most of this enzyme is also degraded in an early biosynthetic compartment. © 1996 Wiley‐Liss, Inc.