The plate was washed to remove any unbound protein and reagents followed by the addition of an alkaline phosphatase affinity-purified goat anti-rabbit IgG conjugate.
Bound mouse immunoglobulin was detected using alkaline phosphatase conjugated affinity purified goat anti-mouse IgG (H+L) (Jackson Immuno Research, West Grove, PA), diluted 1 1,000 in 0.1% BSA/PBS; 100 μl was added to each well.
Anti-C protein antibodies bound to the plate coated with C protein were detected by using alkaline phosphatase-conjugated, affinity-purified antibody against IgE, IgG, IgG1, IgG2a, IgG2b, IgG2c, and IgG3 (SouthernBiotech, Birmingham, AL, USA).
OA is a serine/threonine protein phosphatase inhibitor with high affinity for PP2A and much lower affinities for PP1 and PP2B.
However, the response regulator SphR and its target genes phoA (alkaline phosphatase) and pts (high affinity Pi transporter) are present in the A. platensis genome, suggesting a different regulation system in this cyanobacterium.
The resulting phosphorylation eIF2α-NTD was incubated with affinity-purified phosphatase in 20 mM Tris HCL pH 7.4, 50 mM KCl, 2 mM MgCl2, 0.1 mM EDTA, 0.8 mM ATP at 30°C for indicates times with shaking.
It seems very unlikely that insulin binding to the extracellular α-chain of the receptor induces conformational changes in the intracellular β-chain that are large enough to significantly change the affinity of phosphatases for their phosphorylated substrate sites.
After 1 h and extensive washings, plates were incubated with an alkaline phosphatase-conjugated polyclonal affinity-purified goat anti-human IgG (Sigma chemical Co., St Louis, MO, USA).
The model also suggests that the coherent convex binding surface would likely interact with both pyrin and the PEST phosphatases, since these PSTPIP1 mutations have been shown to reduce binding affinity for PEST phosphatases and increase affinity for pyrin (Shoham, 2005).
Last, the binding of AMP to AMPK renders it a better substrate for LKB1 and reduces its substrate affinity for protein phosphatase [22], [23], [24].
