Following 500 million years of evolution, approximately three dozen cell-specific intracrine enzymes have been engineered in human peripheral tissues whereby the inactive sex steroid precursor DHEA mainly of adrenal origin is transformed into the appropriate minute intracellular amounts of androgens.
Here, we determined whether the novel form of micro-mitophagy, whereby catalytically inactive GAPDH mediates direct uptake of damaged mitochondria into the lysosomal vacuoles (Yogalingam et al, 2013), is impaired in HD.
In resting T-cells Vav1 adopts an inactive conformation whereby the N-terminus forms an inhibitory loop that occludes the catalytic GEF (guanine-nucleotide-exchange factor) domain from accessing its substrates.
In addition to these domains, hPR have many elements with activator and inhibitory functions enhancing and repressing the transcriptional activation of hPR by their interaction with different transcriptional coregulators.3,8 12 Cytoplasmic hPR have been found as multiprotein chaperone complexes which facilitate their inactive conformation, whereby a ligand can bind with hPR.
CAPS are caused by gain of function mutations [ 40] and are thought to share a common mechanism, whereby the closed and inactive structure of NALP3 is disrupted by the various mutations, leading to activation of the inflammasome complex and IL-1β release [ 41].
Training was continued until stable responding for cocaine was achieved (±10% rewarded responses over 3 sessions) at which time animals were subjected to eight two-hour sessions whereby both the active (right) and inactive (left) levers were presented.
A similar mechanism is likely for sGC, whereby the catalytic center alternates between inactive and active conformations via structural rearrangements.
There are hereditary mechanisms whereby once a portion of DNA is rendered inactive in a cell it remains inactive in all of that cell's descendents.
In a neural context chimeras have also been found in pulse-coupled LIF networks [314], and hypothesised to underly coordinated oscillations in unihemispheric slow-wave sleep, whereby one brain hemisphere appears to be inactive while the other remains active [315].
Transcriptional activation is associated with a dynamic bi-modal 3D organization, whereby the genes switch autonomously from an inactive to an active compartment.
