Moreover, GLIS1 physically interacts with OSK to assist the activation of reprogramming target genes.
This in turn leads to recruitment of several adaptor proteins (including Grb2, Shc, and SOS) to the plasma membrane, which assists the activation of the MAPK phosphorylation cascade consisting of the Ras-Raf-Mek-Erk kinases.
B cells act as antigen-presenting cells, are precursors of autoantibody-producing cells, and produce proinflammatory and anti-inflammatory cytokines and chemokines that assist the activation of T cells, all of which may contribute to the pathogenesis of autoimmune diseases [ 1, 5].
Previous data from our lab indicated that extracellular hsp90α increases cancer cell invasion by assisting in the activation of MMP-2 [ 2].
Several scenarios exist; Lys ubiquitination could act as a scaffold driving CIITA nuclear localization where ERK1/2 then binds and phosphorylates CIITA or Lys ubiquitination could be assisting in the activation of ERK1/2, as has been seen with other kinases, as is the case with protein kinase B (Akt) [ 42].
Using exogenous nucleophiles and synthetic methylphosphonate or 5′-thiolate substrates, we decipher that Trp330 also assists in the activation of the scissile phosphate and the departure of the 5′-hydroxyl leaving group.
This supports our hypothesis that extracellular Hsp90α functions with co-chaperones to assist in the activation of MMP-2 and can do so independently of ATP.
Since Hsp90α has been shown to activate other extracellular proteins [12], [47], it would be interesting to determine if this activation complex exists in normal cells as well as cancer cells and if it assists in the activation of other extracellular client proteins.
Thus, B cells can act as highly efficient antigen presenting cells, which assist in the activation of autoreactive T cells.
NPR1 assists in the activation of programmed cell death, acting as a negative regulator (Caarls et al. 2015).
