sandhoff disease/arginine

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Molecular basis of an adult form of Sandhoff disease: substitution of glutamine for arginine at position 505 of the beta-chain of beta-hexosaminidase results in a labile enzyme.

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Sandhoff disease is a lysosomal storage disorder characterized by accumulation of GM2 ganglioside due to mutations in the beta-chain of beta-hexosaminidase. Hexosaminidase activity is negligible in infantile Sandhoff disease whereas residual activity is present in juvenile and adult forms. Here we

Active arginine residues in beta-hexosaminidase. Identification through studies of the B1 variant of Tay-Sachs disease.

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Lysosomal beta-hexosaminidase (EC 3.2.1.52) occurs as two major isoenzymes, hexosaminidases A (alpha beta) and B (beta beta). The alpha- and beta-subunits are encoded by the HEXA and HEXB genes, respectively. Extensive homology in both the gene structures and deduced primary sequences demonstrate

Compound heterozygosity with two novel mutations in the HEXB gene produces adult Sandhoff disease presenting as a motor neuron disease phenotype.

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Little information is available on molecular defects involved in adult Sandhoff disease presenting as motor neuron disease phenotype. We studied enzyme activities of beta-hexosaminidase (Hex) and the HEXB gene encoding the beta-subunit of Hex in a family of the Japanese case. Enzyme assay with

A novel HEXB mutation and its structural effects in juvenile Sandhoff disease.

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Mutations in HEXB, encoding the beta-subunit common to hexosaminidases A and B, cause the neurodegenerative condition, Sandhoff disease. A homozygous missense HEXB mutation (p. D459A) was discovered in six patients with a rare juvenile variant: we show that this disrupts a salt bridge between

Nonsense mutation of feline beta-hexosaminidase beta-subunit (HEXB) gene causing Sandhoff disease in a family of Japanese domestic cats.

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G(M2) gangliosidoses are inherited metabolic disorders and are caused by severely reduced enzymatic activity of lysosomal beta-hexosaminidase. In the present study, the open reading frame (ORF) of the HEXB gene in a family of Japanese domestic cats with G(M2) gangliosidosis variant 0 (Sandhoff

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