Although the A188S mutation slightly reduced calpain cleavage, deletion of this residue (Δ188) greatly impaired calpain cleavage, supporting the importance of this region for calpain cleavage (Fig. 5E,F).
It promotes integrin and protease activation and EpC cleavage, supporting motility and invasion.
Treatment with a broad range caspase inhibitor, z-VAD-fmk significantly blocked EphB3-induced cell death and EphB3 cleavage, supporting a caspase-dependent mechanism.
PBA stimulation of α-secretase mediated APP cleavage is supported by experiments targeting either α- or β-secretase with selective inhibitors.
When these mutations were assayed in the backbone of an EGFP-SMNex1-5 thencation, the D44V mutation no longer blocked calpain cleavage, further supporting a role for the C-terminus in regulating availability of the cleavage site (Fig. S6).
Our findings that NRP-1-induced cell survival more directly affects caspase-9, then caspase-3, but not caspase-8 cleavage, also supports the concept that phospholipases may be primarily involved in the intrinsic (mitochondria-dependent) arm of the bifurcate pathways of apoptosis mediated by death receptors.
This mutation rescues an A756G substitution that normally results in a 1000-fold reductinn in cleavage activity, supporting the role of A756 as the general acid.
Ion intensities for the resulting precursor peptide, leader peptide and core peptide were normalized and the proteolytic efficiency was measured as the amount of substrate left after cleavage reaction (Supporting Information Table 2).
A radical mechanism for C1 C2 bond cleavage is supported by the observed ring-opening of cyclopropyl aldehydes and oxiranyl aldehydes designed to act as "radical clocks" during deformylation by cADO.
The capacity of PBA to counteract ER stress and promote protein trafficking through the secretory pathway, along with PBA mediated stimulation of α/γ-cleavage, strongly supports the investigation into the therapeutic potential of PBA for the treatment of AD.
