Abstract:
:Abasic substitutions in the non-template strand and promoter sequence changes were made to assess the roles of various promoter features in sigma70 holoenzyme interactions with fork junction probes. Removal of -10 element non-template single strand bases, leaving the phosphodiester backbone intact, did not interfere with binding. In contrast these abasic probes were deficient in promoting holoenzyme isomerization to the heparin resistant conformation. Thus, it appears that the melted -10 region interaction has two components, an initial enzyme binding primarily to the phosphodiester backbone and a base dependent isomerization of the bound enzyme. In contrast various upstream elements cooperate primarily to stimulate binding. Features and positions most important for these effects are identified.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Fenton MS,Gralla JDdoi
10.1093/nar/gkg400keywords:
subject
Has Abstractpub_date
2003-06-01 00:00:00pages
2745-50issue
11eissn
0305-1048issn
1362-4962journal_volume
31pub_type
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