Abstract
It has recently been demonstrated that ribosomes are preferentially localized outside the nucleoid in Escherichia coli, but little is known about the spatial regulation of pre-rRNA processing. In this work, I investigate the cellular distribution of leader pre-rRNAs using RNA-FISH. In contrast to mature rRNA, the 5' proximal leader region associates with the nucleoid, and this association occurs in an RNase III-dependent manner. Moreover, RNase III plays a role in the rapid induction of ribosomal operons during outgrowth and is essential in the absence of the transcriptional regulator Fis, suggesting a linkage of transcription and RNA processing for ribosomal operons in E. coli.
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