The synthesis of GTP‐ and ATP‐3'‐pyrophosphate by Streptomyces morookaensis nucleotide 3′‐pyrophosphokinase was little affected by the presence of a ribosome‐deacylated tRNA‐poly A,G,U mixture in vitro. The Streptomyces pyrophosphokinases thus do not appear, unlike bacterial stringent factors, to play a significant role in the cellular stringent control.
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