The b -propeller acts as a scaffold for the binding site for G a . G-Protein may be examined in detail using Chime at right. As with the cyclic AMP cascade, a hormone activates GDP-GTP exchange. The animation at right depicts such a phosphatidylinositol signal cascade. Receptor Tyrosine Kinases are covered in the Cell Biology course.
Prostaglandins are local hormones.
They are formed from the fatty acid arachidonate, which is often one of the fatty acids in PIP 2 . It may be released from diacylglycerol as part of the phosphoinositide cascade. Copyright 1998-2000, by Joyce J. Diwan. All rights reserved.