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Amino acid substitutions were introduced into a structurally flexible and highly conserved region of Escherichia coli SpoT protein. SpoT protein changed from Asp to Ala at the 293rd position did not restore cell growth of E. coli CF8295 (delta relA, delta spoT) and did not accumulate ppGpp in the cell, suggesting that the Asp293 is indispensable for ppGpp synthesis of the protein.

Identification of an Indispensable Amino Acid for ppGpp Synthesis ofEscherichia coliSpoT Protein