Bulges serve in a variety of functions including viral replication, ligand binding, feedback regulation, intron splicing, gene expression, as well as the formation of RNA tertiary structures.
Whilst these studies stated that this N-terminal region did not influence GFRP binding, feedback regulation or GCH1 activity, other studies have contradicted these findings, suggesting that the absence of a complete N-terminal region can alter GCH1 activity and further limits the capacity of GCH1 to bind to GFRP (Swick and Kapatos, 2006; Higgins and Gross, 2011).
DOI: http://dx.doi.org/10.7554/eLife.03638.016 We further demonstrated that CTP binding is necessary for polymerization by showing that a CtpSE155K mutant defective for CTP-binding feedback inhibition (reviewed in Endrizzi et al., 2005) (Trudel et al., 1984; Ostrander et al., 1998) fails to polymerize under the same CTP-producing conditions in which wild-type enzyme polymerizes.
Since PDE10A is dominantly expressed in the striatal MSNs, we hypothesized that alterations in DA neurotransmission might also influence PDE10A binding through feedback on the cAMP/PKA pathway.
In the open loop circuit, the negative feedback binding reactions are set to zero (Table 1).
A major challenge is identification of their binding sites because feedback loops and homeostatic interactions may mask the direct impact of those factors in transcriptome analyses.
Because BPA has been shown to possess antiandrogenic activity (Bonefeld-Jørgensen et al. 2007; Lee et al. 2003), an alternative explanation could be that a blockade of androgen-binding sites alters feedback control mechanisms that leads to an increase in circulating testosterone.
Among these lncRNAs, Lethe was found to be particularly important for the pro-inflammatory state of aging tissues by providing an key negative feedback loop: binding of Lethe to the NF-κB subunit RelA inhibited DNA binding and reduced the production of inflammatory proteins [ 178].
The mathematical model for Design III considered dimers as active TFs and one binding site for each feedback.
The data were used to calibrate the models in Figure 2C,D (substrate inhibition model with positive feedback on binding and hydrolysis, respectively).
Some of the protein family members represent isozymes, sequence similar enzymes that catalyze the same reaction but with definable differences such as substrate breadth, feedback inhibition, binding constants, reaction rates and the like.
