Sun W, Hattman S, Fujita N, Ishihama A
Department of Biology, University of Rochester, New York 14627, USA.
J Bacteriol. 1998 Jun;180(12):3257-9. doi: 10.1128/JB.180.12.3257-3259.1998.
Late in its growth cycle, transcription of the phage Mu mom Promoter (Pmom) is activated by the phage gene product, C, a site-specific DNA binding protein. In vitro transcription analyses showed that this activation does not require specific contacts between C and the carboxyl-terminal region of the alpha or sigma 70 subunit of Escherichia coli RNA polymerase. Unexpectedly, these results are in contrast to those known for another Mu-encoded transcriptional activator, Mor, which has a high degree of sequence identity with C and appears to interact with the carboxyl termini of both alpha and sigma 70.
在其生长周期后期,噬菌体Mu的妈妈启动子(Pmom)的转录由噬菌体基因产物C激活,C是一种位点特异性DNA结合蛋白。体外转录分析表明,这种激活不需要C与大肠杆菌RNA聚合酶α或σ70亚基的羧基末端区域之间的特异性接触。出乎意料的是,这些结果与另一种Mu编码的转录激活因子Mor的已知结果相反,Mor与C具有高度的序列同一性,并且似乎与α和σ70的羧基末端相互作用。