In the crowded cell, chaperones help prevent partly folded proteins from bumping into other proteins that may try to swap elements or otherwise interfere with proper folding.
Thus, the use of T cell chaperones for AuNP delivery could enhance the efficacy of nanoparticle-based therapies and imaging applications by increasing AuNP tumor accumulation.
Overproduction of soluble recombinant protein in E. coli can be limited by the deprivation of host cell chaperones that are required for correct folding of the respective protein.
Once inside the cell, chaperones, such as UreG and HypAB, bind and insert nickel into the appropriate protein (e.g. urease) [ 76].
Cell chaperones which assist in normal protein folding and removal of misfolded proteins may pose promising therapeutic targets in ILD [ 27].
There are significant challenges as the pore size of the B-domain requires unfolding of proteins in order to translocate followed by refolding of the protein which requires a host cell chaperone.
Since the resulting increase in intracellular ionic strength is harmful for the function of cellular components, cells synthesize chaperones, such as Hsp70, as well as enzymes and transporters whose collective function is to increase the intracellular concentration of compatible organic osmolytes to normalize the ionic strength of the intracellular fluid [1], [2].
In sterol-depleted cells, SCAP chaperones SREBP from the ER to the Golgi where the SREBP is cleaved by two Golgi residing proteases, site-1 protease (S1P) and site-2 protease (S2P).
AlphaB-crystallin (HSP20), GRP75, HSP74 and ENPL (HSP90), all found under-expressed in AKU cells, are chaperones known to block amyloid aggregation in vitro and in cell and animal models [24,25], like also Protein DJ-I, known to prevent α-synuclein aggregation [26].
In neuroendocrine cells, SNARE chaperones, such as MUNC18 family, small GTPases like RAB3 and calcium-sensing family of synaptotagmins, as well as SNAREs themselves are thought to be involved in those docking and 'priming' steps (Weimer & Jorgensen, 2003; Wu et al, 2012).
