While a number of ORFs are exclusively induced upon osmotic downshift, a considerable overlap with genes that are differentially regulated upon oxygen exposure, including chaperones, proteases, and proteins involved in protection from oxygen damage, was apparent (Tables S1 and S2).
The ArsR family transcriptional regulator, [tde1382], was upregulated upon osmotic downshift and oxygen stress, but downregulated during blood exposure (Table 3).
In other organisms mechano-sensitive channels and aquaporins have been implicated in osmoregulation of cell turgor upon osmotic downshift [14], [15].
Primer extension analysis performed with an hp0119-specific oligonucleotide revealed similar transcript amounts in the G27 wild-type and the hybrid strain G27/WS1818 grown at pH 5.0 indicating that an efficient acid response is triggered by WS1818 upon pH downshift.
However, Mia1p-GFP accumulated in the nuclei of interphase crm1-809 cells at the restrictive temperature of 18°C (nuclear Mia1p-GFP signal increases ∼90%, n = 50 cells, p<0.01 upon temperature downshift).
Dephosphorylation of the NLS occurs much too quickly upon glucose downshift to be explained solely as an inhibition of PKA activity (De Wever et al. 2005).
The anticonvulsant drug lamotrigine displayed the largest change in minimum inhibitory concentration (MIC) upon temperature downshift, increasing in potency more than 50-fold from >512 μM at 37°C to 7.8 μM at 15°C.
Recently, activation of the HOG pathway upon a downshift in temperature (30 to 12°C) was monitored in S. cerevisiae, whereas in Schizosaccharomyces pombe the Sty1p MAP-kinase (the Hog1p homolog) lead to the activation of several cold-induced genes [ 35, 36].
A quick slap of the throttle with your right foot will also call upon the transmission to downshift before a turn.
Deceased TORC1 activity occurs upon nitrogen starvation or downshift and increased activity results from nitrogen source upshifts or from cycloheximide treatment, which causes an increase in intracellular amino acids as a result of diminished protein synthesis (Binda et al. 2009).
