CH 16 - Chapter 16 Cell Communication Signal Trandsuction...

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1 Chapter 16 Cell Communication 16_02_Signal_transduct.jpg Signal Trandsuction is the process of converting one type of signal to another.
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2 Signal Transduction All cells sense and respond to their environment, which may include signals that originate from other cells - intercellular communication Signal transduction: • Recognition of a signal ( reception ) • Conversion of information within the cell to another form ( transduction ) • Relay and amplification of the information • Cellular response • Removal of the signal or reset the response machinery What are “signals” in cell communication? How are signal molecules detected by a target cell? Signal molecules: Proteins, peptides, amino acids, hormones, fatty acids, sugars, inorganic compounds, gases. Signal recognition: Receptor proteins (receptors)
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3 16_03_signal_various.jpg Long distance, wide distribution Short distance, local distribution Long distance, cell specific Cell-cell specific General styles of cell communication Response to signals Cells are exposed to hundreds of different signal molecules but each cell responds only to a limited set. Response is dependent on whether a cell has a specific receptor for a given signal. Production of a limited set of receptors allows a cell to restrict the number of signals that can affect it.
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4 Receptors may be located on the cell surface or within the cell Dependent on general features of the signal molecule Recognition can also be direct interaction with an enzyme
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5 A limited set of signals can still provide a complex response 1. The relay and amplification of a one transduced signal can affect many cellular processes. 2. The same signal molecule can produce different responses in different types of cells.
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CH 16 - Chapter 16 Cell Communication Signal Trandsuction...

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