Function
Involved in transcription antitermination. Required for transcription of ribosomal RNA (rRNA) genes. Binds specifically to the boxA antiterminator sequence of the ribosomal RNA (rrn) operons (PubMed:7045592, PubMed:7678781, PubMed:11884128, PubMed:14973028, PubMed:15716433, PubMed:16109710). The affinity of NusB for the boxA RNA sequence is significantly increased in the presence of the ribosomal protein S10 (PubMed:16109710, PubMed:11884128). NusB may serve as a loading factor that ensures efficient entry of S10 into the transcription complexes (PubMed:19111659). It also modulates the rrn boxA-mediated transcription elongation rates (PubMed:10383769).