The auxotroph, which is unable to synthesize natural d-alanine as an endogenous competitor of the synthetic substrate, labeled more strongly.
For simulated data, noiseless target and reference region TACs were first generated using the full ntPET model [Morris et al., 2005], which is a nonlinear model of tracer binding to a receptor in the presence of a time-varying endogenous competitor.
Moving from the evidence that - despite lack of translation - sequence conservation of pseudogenes suggests functionality, the authors proposed them as perfect endogenous competitors of their ancestral genes, because they retain many of the miRNA binding sites.
The central conclusion of Poliseno et al. (2010) is that expression of an endogenous miRNA competitor (e.g. a pseudogene) can de-repress miRNA function.
While repetition of these figures panels is useful, none of these experiments tackle the central conclusions of Poliseno et al. (2010) – that expression of an endogenous miRNA competitor (e.g. a pseudogene) can de-repress miRNA function.
Likewise, bacterial factors that contribute to virulence towards the insect host or to defense against predators likely vary based on selective pressures of environmental differences encountered by the bacterial strains, such as the insect host species, endogenous bacterial competitors within these insects, or the predators, competitors, and pathogens naturally encountered.
Further, in assessing the potential relevance of 2OG oxygenase inhibition by endogenous 2OG competitors, consideration should be given to the 2OG/inhibitor concentrations in cells, enzyme concentration, and 2OG KM/KD values; the latter can vary substantially (> 100-fold) [110].
In addition, we have shown that endogenous PK is an effective OxPhos competitor for endogenously produced ADP.
In line with these findings, an efficient competitor of E2 for endogenous GPR30 in SkBr3 cells, such as an ortho, para-dichlorodiphenyldichloro-ethylene (DDE) derivative, was ineffective in binding to recombinant GPR30 (Thomas et al. 2005; Thomas and Dong 2006).
Side by side analysis of CD40 transfectants with their CD40-negative counterparts as well as the analysis of cells with endogenous CD40 expression in the absence and presence of the competitor scFv G28-Fc-GpL revealed scFv G28-Fc-GpLnhanced apoptotic activity for both conscFv G28-Fc-GpL40 binding.
If endogenous estrogen is high and potent, genistein can act as a competitor to estrogen and thus antagonize this hormone's progrowth effects (reviewed in [ 171]).
