The structural basis for terminator recognition by the Rho transcription termination factor

Cynthia E. Bogden, Deborah Fass, Nick Bergman, Matthew D. Nichols, James M Berger

Research output: Contribution to journalArticle


The E. coli Rho protein disengages newly transcribed RNA from its DNA template, helping terminate certain transcripts. We have determined the X- ray crystal structure of the RNA-binding domain of Rho complexed to an RNA ligand. Filters that screen both ligand size and chemical functionality line the primary nucleic acid-binding site, imparting sequence specificity to a generic single-stranded nucleic acid-binding fold and explaining the preference of Rho for cytosine-rich RNA. The crystal packing reveals two Rho domain protomers bound to a single RNA with a single base spacer, suggesting that the strong RNA-binding sites of Rho may arise from pairing of RNA- binding modules. Dimerization of symmetric subunits on an asymmetric ligand is developed as a model for allosteric control in the action of the intact Rho hexamer.

Original languageEnglish (US)
Pages (from-to)487-493
Number of pages7
JournalMolecular Cell
Issue number4
Publication statusPublished - Apr 1999
Externally publishedYes


ASJC Scopus subject areas

  • Molecular Biology

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