Foodchem Lecture 10 Pics PART2

The flashcards below were created by user Morgan.liberatore on FreezingBlue Flashcards.

  1. Image Upload 1
    • Various versions of hydrogen bonds
    • Hydrogen bonds are formed as a result of an electron density differential between oxygen and hydrogen
    • Oxygen - electron rich
    • Hydrogen - electron poor
  2. Image Upload 2
    In proteins hydrogen bonding acts as a zipper-like force to lock the protein in a helical conformation
  3. Image Upload 3
    • Alpha helix close up
    • In proteins hydrogen bonding acts as a zipper-like force to lock the protein in a helical conformation
  4. Image Upload 4
    • Myoglobin - mostly alpha helix
    • Whether or not a helical structural region form is a function of the amino acid composition (sequence) within the protein
  5. Image Upload 5
    • Most amino acids contribute to helix formation with the exception of proline and hydroxyproline (imino acids)
    • This is because they do not have a true amino group to contribute
    • If imino acids are present in the chain, the helical structure will be disrupted at that poit and a random sequence may arise
  6. Image Upload 6
    • Beta pleated sheet
    • If proteins are synthesized side by side or lie parallel to each other, hydrogen bonds can form between chains (inter-molecular hydrogen bonding) to produc a sheet-like structure
  7. Image Upload 7
    • Two subforms of beta pleated sheets: Parallel and anti-parallel
    • Inter-molecular hydrogen bonding (as opposed to intra-molecular hydrogen bonding for the alpha helix structure)
  8. Image Upload 8
    Parallel beta sheet
  9. Image Upload 9
    Antiparallel beta sheet
  10. Image Upload 10
    • Mixed alpha, beta forms and random coil
    • Beta sheet structures can be present within the tertiary structure of a protein when chains lie next to each other
  11. Image Upload 11
    • Suprahelix
    • Found in collagen
    • Composed of 33% glycine, and 25% proline/hydroxyproline
    • 3 separate macromolecules, of which 2 are similar and 1 is different, intertwined
  12. Image Upload 12
    • Basic unit of a suprahelix - tropocollagen
    • Suprahelix is held together by hydrogen bonding between the chains, with the hydrogen bonds being supplied by glycine
  13. Image Upload 13
    • Collagen formation
    • Disrupted collagen is extensively used as a gelling and binding agent in food systems
    • Beta pleated sheet and suprahelix are basic structural units which are subsequently assembled into more complex forms
Card Set
Foodchem Lecture 10 Pics PART2
Foodchem Lecture 10 Pics PART2
Show Answers