Calyculin A is a serine/threonine phosphatase inhibitor that inhibits the activity of protein phosphatases PP1 and PP2A. Human carcinoma A431 cells treated with calyculin A for 30 minutes can undergo significant threonine phosphorylation, as shown by western blotting using anti-Phospho-Akt (Thr-34), cat.# AP1001, as compared to untreated, control cell lysates.
Confluent cultures of A431 cells were serum starved overnight. Cells were then either left untreated (Cat.# AL9001) or treated with Calyculin A at a final concentration of 100 nM for 30 minutes at 37°C (Cat.# AL9101). Cells were lysed in 1% SDS, 1.0 mM sodium ortho-vanadate, 1 mM sodium fluoride, 10 mM Tris (pH 7.4) buffer. Protein concentration was determined using the BCA method (Pierce) before diluting to final concentration and buffer.
Western blot analysis of A431 cells (20 µg/lane) serum starved overnight (lanes 1 & 3) and Calyculin A (100 nM) treated for 30 minutes (lanes 2 & 4). The blot was probed with anti-phospho-Akt (Thr-34) (lanes 1 & 2) or anti-Akt (lanes 3 & 4).
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*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blotmobilities of known proteins with similar MW.
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