It is very hard to determine S-nitrosation of sample proteins because of the background present in the control.
350 μg of sample proteins and 150 ng of the provided Tyr 1248 HER2 protein control were used for measurements.
To ensure equal protein load from different samples, protein contents of whole cell lysates were measured by the method of Bradford and equal protein amounts were loaded.
Control samples (proteins extracted from roots of control plants) were labeled with reagent 114; samples from Mn-deficient roots were labeled with reagent 116.
Together, these demonstrate the versatility of Nanodisc technology for preparing monodisperse samples of membrane proteins of wide-ranging structure.
Fundamentally, every existing sample of proteins is subject to these problems.
Once you have a relatively purified sample of protein containing your PTM s) of interest, the next step involves the chemical or enzymatic degradation of the protein and then separation of the peptides.
Figure 1 shows an example of how MCODE detects protein complexes from a small sample graph of protein-protein interactions.
Finally, the prepared sample of protein layer was kept in PBS at 4°C until use.
The prepared sample of protein layer was stored in PBS at 4 °C before use.
