A S Balasubramanian
Articles written in Journal of Biosciences
Volume 5 Issue S1 December 1983 pp 61-64
The use of concanavalin A in the purification or separation of multiple forms of brain hydrolases
A S Balasubramanian T Alam R Mathur S Lakshmi R Cherian K Alvares
Concanavalin A bound to Sepharose has been used for the purification of brain β-galactosidase, α-L-fucosidase, α-D-mannosidase, arylsulphatase and β-glucuronidase.0 Several factors
Volume 6 Issue 1 March 1984 pp 79-85
The minor anionic form of arylsulphatase B (arylsulphatase Bm) of monkey brain. Purification and phosphoprotein nature
The anionic form of arylsulphatase B (arylsulphatase Bm) was purified to apparent homogeneity from monkey brain through steps involving chromatography on diethylaminoethyl-cellulose, Blue-Sepharose, Biogel HTP and finally Biogel P-300 gel filtration. The molecular weight of the purified enzyme as deduced by gel filtration on Biogel P-300 and by sodium dodecylsulphate gel electrophoresis was ∼ 30,000.
Volume 10 Issue 2 June 1986 pp 215-225
The binding requirements of monkey brain lysosomal enzymes to their immobilised receptor protein
Keith Alvares K Panneerselvam A S Balasubramanian
The lysosomal enzyme binding protein (receptor protein) isolated from monkey brain was immobilised on Sepharose 4B and used to study the binding of brain lysosomal enzymes. The immobilised protein could bind \-D-glucosaminidase, α-D-mannosidase, α-L-fucosidase and²-D-glucuronidase. The bound enzymes could be eluted either at an acid pH of 4.5 or by mannose 6-phosphate but not by a number of other sugars tested. Binding could be abolished by prior treatment of the lysosomal enzymes with sodium periodate. Alkaline phosphatase treatment of the enzymes did not prevent the binding of the lysosomal enzymes to the column but decreased their affinity, as seen by a shift in their elution profile, when a gradient elution with mannose 6-phosphate was employed. These results suggested that an ‘uncovered’ phosphate on the carbohydrate moiety of the enzymes was not essential for binding but can enhance the binding affinity.
Volume 11 Issue 1-4 March 1987 pp 7-21
Mammalian sulfoconjugate metabolism
Joy Mathew A S Balasubramanian
Sulfoconjugates occur ubiquitously as sulfopolysaccharides, sulfolipids and sulfoproteins. A variety of sulfotransferases catalyze the sulfation process with 3’-phosphoadenosine 5’-phosphosulfate as the sulfate donor. Sulfatases that catalyze the desulfation of different sulfoconjugates are known to be deficient in a number of genetic storage disorders.
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