Belintsev B N, Zavriev S K, Shemyakin M F
Nucleic Acids Res. 1980 Mar 25;8(6):1391-404. doi: 10.1093/nar/8.6.1391.
Influence of ionic strength on the kinetics of the promoter complex formation between E. coli RNA polymerase and T7 phage DNA was investigated using a membrane filter assay. The enzyme-promoter association rate constant was determined. It varies from 10(9) to 3 x 10(7) M-1 sec-1 when the ionic strength is changed from zero to 0.15 M NaCl. Basing on the theoretical analysis of experimental data obtained the model for the promoter site selection assuming the enzyme sliding along the DNA is discussed.
使用膜滤器测定法研究了离子强度对大肠杆菌RNA聚合酶与T7噬菌体DNA之间启动子复合物形成动力学的影响。测定了酶与启动子的缔合速率常数。当离子强度从零变化到0.15 M NaCl时,其值从10⁹到3×10⁷ M⁻¹ s⁻¹不等。基于对所得实验数据的理论分析,讨论了假设酶沿DNA滑动的启动子位点选择模型。