Abstract:
:The bacterial transcription terminator, Rho, terminates transcription at half of the operons. According to the classical model derived from in vitro assays on a few terminators, Rho is recruited to the transcription elongation complex (EC) by recognizing specific sites (rut) on the nascent RNA. Here, we explored the mode of in vivo recruitment process of Rho. We show that sequence specific recognition of the rut site, in majority of the Rho-dependent terminators, can be compromised to a great extent without seriously affecting the genome-wide termination function as well as the viability of Escherichia coli. These terminators function optimally only through a NusG-assisted recruitment and activation of Rho. Our data also indicate that at these terminators, Rho-EC-bound NusG interaction facilitates the isomerization of Rho into a translocase-competent form by stabilizing the interactions of mRNA with the secondary RNA binding site, thereby overcoming the defects of the primary RNA binding functions.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Shashni R,Qayyum MZ,Vishalini V,Dey D,Sen Rdoi
10.1093/nar/gku690subject
Has Abstractpub_date
2014-09-01 00:00:00pages
9677-90issue
15eissn
0305-1048issn
1362-4962pii
gku690journal_volume
42pub_type
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