In our studies using gelatin as substrate, we observed that major proteolysis occurred in alkaline conditions (pH 8.0), confirming previous results using females and larvae [37], [40].
Hence, major proteolysis did not occur at the time of manipulation.
In the presence of 5 mM AMPPCP, two major proteolysis products were observed (labelled as fragments B and C in Figure 5), both of which are different from the major fragment observed in the apo-state.
Complement is a sophisticated proteolysis system which plays two major roles in humoral immunity: one is to lyse pathogenic cells directly; and the other is to opsonize pathogens for phagocytosis and to recruit immunocytes to the reaction focus.
Although a ubiquitin proteasome proteolysis system has not been reported in mitochondria, we could not rule out the possibility that RIF2 is involved in ubiquitin-proteasome proteolysis of impaired mitochondrial proteins after their translocation to the outer membrane as reported for quality control of human mitochondria (Shanbhag et al. [2012]).
These data indicate that Duzhong was involved in the amelioration of the UPS-dependent proteolysis system.
A highly active ubiquitin mediated proteolysis system indicates an excess of miss-formed proteins within the cell.
They include the ubiquitin-proteasome system, the stress response system, the regulated intramembrane proteolysis system, the parasite egress network, and the signal peptidase network.
SRPX2 was also found to interact with the protease cathepsin B (CTSB) and the metalloproteinase ADAMTS4 which are components of the extracellular proteolysis system.
All of the major proteolytic systems are responsible for CMV-induced proteolysis; these include lysosomal proteases [ 18], calcium-dependent proteolysis or calpains [ 14], caspase-3 [ 34], and the ATP-dependent ubiquitin proteasome [ 17].
