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1. What is protein structure? 2. Why is it important to know the primary structure? 3....

1. What is protein structure?

2. Why is it important to know the primary structure?

3. What are the secondary structure elements in proteins?

4. How do we study protein structure? Mention at least 2 techniques.

5. What are some examples of basic amino acids and acidic amino acids?

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Answer #1

1. Protein structure = Overall stable 3D-arrangement of amino acids in space
It includes four levels.
i. Primary structure = Linear sequence of amino acids
ii. Secondary structure = Local arrangement of polypeptide backbone
iii. Tertiary structure = Overall 3D-arrangement of polypeptide
iv. Primary structure = Interactions among constituent subunits in a multimeric protein

2. The primary structure ultimately determines the overall structure and function of a protein

3. Secondary structure = Local arrangement of the polypeptide backbone
The secondary structure is stabilized by hydrogen bonds between amino groups and carboxyl groups

4. Techniques to study protein structure:
i. Circular Dichroism
ii. X-ray crystallography
iii. Nuclear magnetic resonance spectroscopy

5. Basic amino acids = Lysine, Histidine, and arginine
Acidic amino acids = Aspartic acid and glutamic acid

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