Flashcards in Proteins Deck (11):
What are the four basic categories of amino acids?
- uncharged polar
Give two examples of acidic amino acids
- aspartic acid
- glutamic acid
Give three examples of basic amino acids
Give three examples of uncharged polar amino acids
Give three examples of non polar amino acids
Give five functions of proteins
- control of gene expression
What is the primary structure of proteins?
The sequence of amino acids in a polypeptide chain, this is the source of versatility in protein structure and function
What is the secondary structure of proteins?
The spatial arrangement of amino acid residues that are near each other in the linear sequence
- alpha helices - telephone cord shape, held in place by H bonds between N-H group and C=O group of the amino acid in the next turn of the helix
- beta-sheet - pleated structure held together by H bonds between the amide groups of linear polypeptide chains
What is the tertiary structure of proteins?
The spatial arrangement of amino acid residues that are far apart in the linear sequence
What is the tertiary structure of proteins dependent on?
- Van der Waals
- ionic interactions
- hydrogen bonding
- disulphide bridges
- hydrophobic interaction