Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The diagram illustrates the interaction between cyclin and Cdk, emphasizing the role of specific amino acids in binding sites.
**Structure and Binding:**
- **Cyclin Binding Site (Cyclin side):**
- Top to bottom: **Serine**, **Lysine**, **Aspartic Acid**, **Lysine**.
- Each amino acid shows its functional group:
- Serine: -OH group
- Lysine: NH3+ group
- Aspartic Acid: -COO group
- **Cdk Binding Site (Cdk side):**
- Top to bottom: **Aspartic Acid**, **Aspartic Acid**, **Lysine**, **Serine**.
- Functional groups:
- Aspartic Acid: -COO group
- Lysine: NH3+ group
- Serine: -OH group
**Interactions:**
- **Bond Formation:**
- Red and purple arrows indicate interactions between corresponding amino acids on each site.
- Bonds are formed between oppositely charged groups or compatible functional groups (e.g., NH3+ with -COO).
**Purpose:**
- These interactions facilitate the formation of the cyclin•Cdk complex, essential for its regulatory function in the cell cycle. Bonds and charges are crucial for maintaining the structural integrity needed for ATP activity at the active site.
This schematic emphasizes the significance of specific amino acid sequences and their interactions in protein regulation.
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