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Proteins. Proteins:. Multipurpose molecules. insulin. pepsin. collagen (skin). Proteins . Examples muscle skin, hair, fingernails, claws collagen, keratin pepsin digestive enzyme in stomach insulin hormone that controls blood sugar levels. Proteins. Function:

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proteins1

Proteins:

Multipurpose molecules

proteins2

insulin

pepsin

collagen (skin)

Proteins

Examples

  • muscle
  • skin, hair, fingernails, claws
    • collagen, keratin
  • pepsin
    • digestive enzyme in stomach
  • insulin
    • hormone that controls blood sugar levels
proteins3
Proteins
  • Function:
    • many, many functions
      • hormones
        • signals from one body system to another
        • insulin
      • movement
        • muscle
      • immune system
        • protect against germs
      • enzymes
        • help chemical reactions
proteins4

H

|

—C—

|

H

amino

acid

amino

acid

amino

acid

amino

acid

amino

acid

C—OH

—N—

O

||

H

Proteins
  • Building block =

amino acids

  • 20 different amino acids

There’s20 of us…

like 20 differentletters in analphabet!Can make lots of differentwords

variable group

amino acid chains

amino acid

amino acid

amino acid

amino acid

amino acid

Amino acid chains
  • Proteins
    • amino acids chained into a polymer
  • Each amino acid is different
    • some “like” water & dissolve in it
    • some “fear” water & separate from it
water fearing amino acids
Water-fearing amino acids
  • Hydrophobic
    • “water fearing” amino acids
    • try to get away from water in cell
      • the protein folds
water loving amino acids
Water-loving amino acids
  • Hydrophillic
    • “water loving” amino acids
    • try to stay in water in cell
      • the protein folds
for proteins shape matters

collagen

For proteins: SHAPE matters!
  • Proteins fold & twist into 3-D shape
    • that’s what happens in the cell!
  • Different shapes = different jobs

growthhormone

hemoglobin

pepsin

it s shape that matters
It’s SHAPE that matters!
  • Proteins do their jobs, because of their shape
  • Unfolding a protein destroys its shape
    • wrong shape = can’t do its job
    • unfolding proteins = “denature”
      • temperature
      • pH (acidity)

unfolded“denatured”

In Biology,

it’s not the size,

it’s the SHAPEthat matters!

folded

activities
Activities
  • demo raw egg vs. cooked egg
    • drop raw egg into boiling water, like egg drop soup
    • compare raw egg to hard-boiled egg
  • demo cheese-making with heated milk & vinegar
  • make yogurt
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