Single-molecule assays of E. coli RNAP transcription elongation in the presence of NusG have shown that it increased the pause-free velocity of RNAP by 10 20% and simultaneously decreased its pause frequency.
NusA increases the pause frequency without affecting the duration of pauses.
The experiments show that downstream torque (positive supercoil) decreases the pause-free velocity of the E. coli RNAP, while it increases the pause density and the duration of pauses.
As in the case of promoter utilization, during pausing, the proposed interaction of the β′ zipper with the Z-like element may increase the pause efficiency by either providing additional contacts of RNAP with the pause signal, or optimizing recognition of the −10-like element of the pause-inducing sequence by σR2 (via structural changes in DNA).
Halting ECs at the pause dramatically increased the C346 pause but had much less effect on the C370 pause (more EC entered the pause state, but the pause duration was unchanged).
We find that as the opposing force, F, is increased, the mean pause-free velocity, v, decreases monotonically, indicating that mRNA translocation is rate limiting under the conditions of the experiment.
Noisy pauses increased the range of syllable pause durations accepted by females.
In addition, they showed that increases in the concentration of σ increased the efficiency of pausing in vitro.
According to a study just published by Sonia Seneviratne of the Institute for Atmospheric and Climate Science, in Zurich, the number of hot days, the number of extremely hot days and the length of warm periods all increased during the pause (1998-2012).
Devaquet et al. [18] extended inspiratory time from 0.7 ± 0.2 to 1.4 ± 0.3 s by increasing the inspiratory pause time from 0 to 20 % of the total breathing cycle.
Backtracking events ( approximately 5 bp) occurred infrequently at locations throughout the DNA template and were associated with pauses lasting 20 s to >30 min. Inosine triphosphate increased the frequency of backtracking pauses, whereas the accessory proteins GreA and GreB, which stimulate the cleavage of nascent RNA, decreased the duration of such pauses.
