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. 1988 Sep 15;254(3):861–868. doi: 10.1042/bj2540861

Canine alpha-L-fucosidase in relation to the enzymic defect and storage products in canine fucosidosis.

C Barker 1, A Dell 1, M Rogers 1, J A Alhadeff 1, B Winchester 1
PMCID: PMC1135162  PMID: 3196299

Abstract

Canine liver alpha-L-fucosidase was purified to apparent homogeneity by affinity chromatography on agarose-epsilon-aminohexanoyl-fucopyranosylamine. It is composed of multiple forms of a common active subunit of 45-50 kDa, which can aggregate in different combinations to form polymers, predominantly dimers. Antiserum was raised against the purified enzyme. There is negligible residual alpha-L-fucosidase in the tissues of English springer spaniels with the lysosomal storage disease fucosidosis. Although no alpha-L-fucosidase protein was detected by Western blotting or by the purification procedure in the affected tissues, some enzymically inactive cross-reacting material was detected in both normal and affected tissues. This suggests that another protein without alpha-L-fucosidase activity was co-purified with the enzyme. Dog liver alpha-L-fucosidase was precipitated by goat anti-(human liver alpha-L-fucosidase) IgG, indicating homology between the enzymes in the two species. Two purified storage products isolated from the brain of a dog with fucosidosis were used as natural substrates for various preparations of canine liver alpha-L-fucosidase. Analysis of the digestion mixtures by t.l.c. and fast-atom-bombardment mass spectrometry suggests that canine alpha-L-fucosidase acts preferentially on the alpha-(1-3)-linked fucose at the non-reducing end and that removal of alpha-(1-6)-linked asparagine-linked N-acetylglucosamine is rate-limiting in the lysosomal catabolism of fucosylated N-linked glycans.

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Selected References

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