Abstract:
:In order to determine how much of the natural sequence is required for function of the lambda tR1 rho-dependent terminator, and to determine the minimum length required, we made two deletion series of a tR1 derivative that contains mostly foreign DNA, encoding C-rich RNA, substituted for the natural upstream sequences of tR1. We find the minimum transcript length to be 85 to 90 nucleotides, although an additional 10 to 25 nucleotides provide more efficient termination. Sequences as close as ten nucleotides to the release sites could be replaced without destroying termination, although termination efficiency was reduced by substitution of these proximal regions with DNA encoding the cytidine-rich RNA that is active at upstream sites. These results suggest that sequences proximal and distal to release sites have different functions and optimal structures for rho activation. We also show that two potential stem-loop structures in the tR1 region are not essential for terminator function, or for pausing at the release region. The results are consistent with the model that any pause site downstream of DNA encoding unstructured C-rich RNA is a potential rho-dependent terminator.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Hart CM,Roberts JWdoi
10.1006/jmbi.1994.1229subject
Has Abstractpub_date
1994-04-01 00:00:00pages
255-65issue
3eissn
0022-2836issn
1089-8638pii
S0022-2836(84)71229-0journal_volume
237pub_type
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更新日期:2009-02-06 00:00:00
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journal_title:Journal of molecular biology
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