期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1977
卷号：74
期号：11
页码：4914-4918
DOI：10.1073/pnas.74.11.4914
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The in vitro binding of the Escherichia coli RNA polymerase (nucleosidetriphosphate:RNA nucleotidyltransferase; EC 2.7.7.6 ) to fragments of {lambda}plac5 DNA generated by restriction endonucleases HindII and HindIII has been studied by a filter binding technique. The results are consistent with RNA polymerase binding at pR', the INT promoter (pI), several sites in the b2 region, the mis promoter, the oop promoter (or pO), and prm. Binding was also observed on some fragments that are not known to contain active promoters, including the fragment from the cIII-tL region. Some of these binding reactions might also be explained by interaction of RNA polymerase with termination sites. Additional polymerase binding sites have been detected by examining which HindII and HindIII sites were not cleaved when digestion was performed after RNA polymerase had been bound to the DNA. This technique revealed polymerase binding at pL, at pR, at a site between R and cos, and at a site at the junction of the {gamma} and cIII-tL fragments. A comparison of the location of polymerase binding fragments with the partial denaturation map of the {lambda} genome indicates that RNA polymerase binding sites are located within A-T rich regions. It is suggested that RNA polymerase binding is a function both of specific sequences (where recognition occurs) and of the base composition of the surrounding regions (which affects the stability of the helix at the specific site).
