2.1.2 Biological Molecules – Protein Structure Flashcards
(12 cards)
How many levels of protein structure do all proteins have? (and what are the names of the levels)
3
Primary structure
Secondary structure
Tertiary structure
What is the definition of a primary structure?
The sequence of the amino acids in a polypeptide chain.
What type of bond is between the amino acids in the primary structure?
Peptide bonds
What is the definition of a secondary structure?.
The folding and coiling of the polypeptide chain into alpha helices and beta-pleated sheets
What is the definition of a secondary structure?.
The folding and coiling of the polypeptide chain into alpha helices and beta-pleated sheets
What is the definition of the tertiary structure?
The folding of the polypeptide into a specific 3D shape.
What 4 types of bond hold the tertiary structure in place?
- Hydrogen bonds
- Disulfide bonds
- Ionic bonds
- Hydrophobic and hydrophilic interactions
Where do the bonds form in a tertiary structure?
Between the R groups on different amino acids.
Where do the disulphide bonds form?
Between two R groups that contain sulfur.
What is the name for the additional level of protein structure that some proteins have?
Quaternary structure
What is the definition of quaternary structure?
The joining of more than one polypeptide chain to form a protein.
What types of bonds hold the quaternary structure in place?
The same as tertiary structure.
1. Hydrogen bonds
2. Disulfide bonds
3. Ionic bonds
4. Hydrophobic and hydrophilic interactions
