3IMQ

Crystal structure of the NusB101-S10(delta loop) complex

Summary for 3IMQ

• Entry DOI: 10.2210/pdb3imq/pdb
• Related: 3D3B 3D3C
• Descriptor: N utilization substance protein B, 30S ribosomal protein S10, POTASSIUM ION, ... (4 entities in total)
• Functional Keywords: processive transcription antitermination; transcription termination; transcription factor; protein-protein interaction; protein-rna interaction, rna-binding, transcription, transcription regulation, transcription termination, ribonucleoprotein, ribosomal protein, transcription regulator - ribosomal protein complex, transcription regulator / ribosomal protein
• Biological source: Escherichia coli K-12; More
• Total number of polymer chains: 6
• Total formula weight: 76374.86

Authors

Luo, X.,Wahl, M.C. (deposition date: 2009-08-11, release date: 2009-11-10, Last modification date: 2023-09-06)

Primary citation

Burmann, B.M.,Luo, X.,Rosch, P.,Wahl, M.C.,Gottesman, M.E.
Fine tuning of the E. coli NusB:NusE complex affinity to BoxA RNA is required for processive antitermination.
Nucleic Acids Res., 38:314-326, 2010

PubMed Abstract: Phage lambda propagation in Escherichia coli host cells requires transcription antitermination on the lambda chromosome mediated by lambdaN protein and four host Nus factors, NusA, B, E (ribosomal S10) and G. Interaction of E. coli NusB:NusE heterodimer with the single stranded BoxA motif of lambdanutL or lambdanutR RNA is crucial for this reaction. Similarly, binding of NusB:NusE to a BoxA motif is essential to suppress transcription termination in the ribosomal RNA (rrn) operons. We used fluorescence anisotropy to measure the binding properties of NusB and of NusB:NusE heterodimer to BoxA-containing RNAs differing in length and sequence. Our results demonstrate that BoxA is necessary and sufficient for binding. We also studied the gain-of-function D118N NusB mutant that allows lambda growth in nusA1 or nusE71 mutants. In vivo lambda burst-size determinations, CD thermal unfolding measurements and X-ray crystallography of this as well as various other NusB D118 mutants showed the importance of size and polarity of amino acid 118 for RNA binding and other interactions. Our work suggests that the affinity of the NusB:NusE complex to BoxA RNA is precisely tuned to maximize control of transcription termination.

PubMed: 19854945
DOI: 10.1093/nar/gkp736

Experimental method

X-RAY DIFFRACTION (2.5 Å)