Biology 2.2.9: Proteins 2: Protein Structure + Bonding Flashcards
what occurs in the primary structure?
the original forming of the sequence of amino acids.
what occurs in the secondary structure?
the amino acids are folded into a beta pleated sheet or an alpha helix
what occurs in the tertiary structure?
the amino acids are folded into a 3D protein molecule
what occurs in the quaternary structure?
multiple proteins are arranged to make a complete protein
what bonding is involved in the primary structure?
peptide bonds
what bonding is involved in the secondary structure?
hydrogen bonds
what bonding is involved in the tertiary structure?
ionic bonds, hydrogen bonds, peptide bonds, disulphide links
what bonding is involved in the quaternary structure?
ionic bonds, hydrogen bonds, peptide bonds, disulphide links
what is hydrogen bonding?
bond forms between H+ atoms and atoms with a - charge
what is an ionic bond?
ionises NH3+ and -COO- groups
what are disulfide links?
the R group of cysteine contains sulfur, disulfide links form between the R groups of 2 cysteine
what hydrophobic and hydrophilic interactions occur?
hydrophobic part of amino acid is found inside the centre of polypeptide + hydrophilic is found on the outside causing a twist in the structure, changing the shape of the protein
