Mutation Spectra and the Neutrality of Mutations
Copyright policy )Mutation Spectra and the Neutrality of Mutations
The effect of amino acid replacements on enzyme function was studied in the tJ-galactosidase of Escherichia coli. Mutants possessing 50% or less of normal enzyme activity were isolated and examined. Of 733 amino acid substitutions calculated to have occurred, only 11 reduced tJ-galactosidase activity below 50 %. These mutations were expressed because they greatly impaired the substrate affinity or catalytic efficiency of the enzyme. The inertness of the enzyme to amino acid replacement was confirmed by immunological tests of tJ-galactosidase molecules changed in amino acid sequence by suppression.
- Australian National University Australia
Hot Temperature, Lactose, Galactosidases, Kinetics, Glucose, Suppression, Genetic, Genes, Genetic Code, Mutation, Operon, Escherichia coli, Serine, Amino Acid Sequence, Binding Sites, Antibody, Enzyme Repression
Hot Temperature, Lactose, Galactosidases, Kinetics, Glucose, Suppression, Genetic, Genes, Genetic Code, Mutation, Operon, Escherichia coli, Serine, Amino Acid Sequence, Binding Sites, Antibody, Enzyme Repression
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