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Hybrids of chemical derivatives of Escherichia coli alkaline phosphatase.
Metadata
JournalBiochim. Biophys. ActaNot FoundDate
1975-Dec-15
Publication Type
Journal Article
Volume
1975-Dec-15 / 412 : 262-72
Author
Meighen E , Yue R
DoiPMIDMESH
Alkaline Phosphatase
Anhydrides
Dithionite
Escherichia coli
Hydrogen-Ion Concentration
Kinetics
Macromolecular Substances
Protein Conformation
Structure-Activity Relationship
Succinates
Tetranitromethane
Abstract
The activities of hybrid dimers of alkaline phosphatase containing two chemically modified subunits have been investigated. One hybrid species was prepared by dissociation and reconstitution of a mixture of two variants produced by chemical modification of the native enzyme with succinic anhydride and tetranitromethane, respectively. The succinyl-nitrotyrosyl hybrid was separated from the other members of the hybrid set by DEAE-Sephadex chromatography and then converted to a succinyl-aminotyrosyl hybrid by reduction of the modified tyrosine residues with sodium dithionite. A comparison of the activities of these two hybrids with the activities of the succinyl, nitrotyrosyl and aminotyrosyl derivatives has shown that either the subunits of alkaline phosphatase function independently or if the subunits turnover alternately in a reciprocating mechanism, then the intrinsic activity of each subunit must be strongly dependent on its partner subunit.
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