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- W1974846959 abstract "1.|Preparations of pig kidney alkaline phosphatase (EC 3.1.3.1) were shown to be homogeneous on polyacrylamide-gel electrophoresis. 2.|The apparent molecular weight of the enzyme determined by gel filtration was approx. 185 000. After treatment with sodium dodecylsulphate, a single band with an apparent molecular weight of 80 000–90 000 was identified in polyacrylamide gels containing sodium dodecylsulphate. Thus pig kidney alkaline phosphatase seems to be composed of two subunits. 3.|Chemical cross-linking with glutaraldehyde or dimethyl suberimidate prior to electrophoresis in polyacrylamide-sodium dodecylsulphate gels gave rise to two bands identified as free subunits and cross-linked dimers. This evidence supports the suggestion that pig kidney alkaline phosphatase (like the enzymes from human placenta, calf intestine and Escherichia coli) consists of two very similar, probably identical, subunits. 4.|Titrations of the enzyme with 32Pi at pH 5.0 (where phosphorylated enzyme is relatively stable) indicated that preparations were 45% pure, assuming that the subunits were identical and that two active sites were operational during the titration. If only one active site per molecule becomes phosphorylated then the purity would be 90%. 5.|There was no evidence of negative cooperativity in the binding studies with Pi but extreme negative cooperativity leading to expression of only one site per dimer could not be excluded. As the electrophoresis results seemed to indicate that the purity of the preparations was greater than 45%, there is some support for the belief that only one site was active." @default.
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- W1974846959 date "1974-12-01" @default.
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- W1974846959 title "Subunit structure and catalytic activity of pig kidney alkaline phosphatase" @default.
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- W1974846959 doi "https://doi.org/10.1016/0005-2744(74)90109-0" @default.
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