1. Cell Biology BME140 Lecture 9 Signal Transduction Pathways
Assist. Prof. Dr. Açelya Yılmazer Aktuna

2. Signal Transduction Pathways
Signaling networks are the nervous system of a cell
Signaling networks transmit information from extracellular environment to interior of cell (i.e., sensory nerves)
Cells collect multiple sources of information and process the information to make decisions (i.e., central nervous system)

3. Signal Transduction Pathways
Signaling networks are the nervous system of a cell
Signaling networks transmit decisions to effector proteins (i.e., motor nerves)
Signaling networks permit cells to maintain homeostasis (i.e., reflex arcs)

4. Signal Transduction Pathways
Signaling networks relay information from the extracellular environment to the interior of a cell
The basic unit of a signaling network is a signal transduction pathway, which carries one specific signal in a single direction from the source (a receptor) to the effector
Most signal transduction pathways are comprised of several different molecules that activate each other in a carefully controlled sequence of binding interactions