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Mutants constitutive for the novel outer membrane protein Ic (e or E) contained a recently discovered binding protein forsn -glycerol-3-phosphate. The corresponding parental strains missing the outer membrane protein Ic (e, E) were negative or strongly reduced in the synthesis of the binding protein. In addition, strains that were previously isolated as mutants constitutive for thesn -glycerol-3-phosphate transport system (ugp + mutants) and that produced the novel periplasmic proteins GP1 to GP4 also synthesized a new outer membrane protein with the same electrophoretic mobility on sodium dodecyl sulfate-polyacrylamide gels as protein Ic. Screening of differentugp + mutants revealed the existence of three types in respect to the four novel periplasmic proteins GP1, -2, -3, and -4: (i) one containing all four proteins; (ii) one containing only proteins GP1, -2, and -3; (iii) one containing only proteins GP1, -2, and -4. In confirmation of the data presented in the accompanying paper by Tommassen and Lugtenberg (J. Bacteriol. 143:151–157, 1980), we found that purified GP1 is identical to alkaline phosphatase, whereas purified GP3 has binding activity of inorganic phosphate and is identical to the phosphate-binding protein. Moreover, growth conditions that lead in a wild-type strain to the derepression of alkaline phosphatase synthesis also derepressed the synthesis of thesn -glycerol-3-phosphate-binding protein as well as the corresponding transport system. Thus, the newsn -glycerol-3-phosphate transport system is part of the alkaline phosphatase regulatory system.

journal of bacteriology

Co-Regulation in <i>Escherichia coli</i> of a Novel Transport System for <i>sn</i> -Glycerol-3-Phosphate and Outer Membrane Protein Ic (e, E) with Alkaline Phosphatase and Phosphate-Binding Protein

Co-Regulation in Escherichia coli of a Novel Transport System for sn -Glycerol-3-Phosphate and Outer Membrane Protein Ic (e, E) with Alkaline Phosphatase and Phosphate-Binding Protein