Biomolecules

Biomolecules

Proteins
1. Monomer is 20 amino acid
2. Two types
  1. Fibrous Proteins
    1. Supporting & Structural Functions
    2. Repetitive sequence of amino acid
    3. Stable Structure & Physically Tough
    4. Forms long sheets of fibers
      1. Due to long parallel chains cross-linked at many points
    5. Found in many parts
      1. Keratin
        Hair
        Feather
        Nails
        Horn
      2. Collagen
        Tendons
        Connective Tissue
        Bone Matrix
      3. Myosin
        Muscle Fibers
      4. Silk
        Spider's web
    6. Secondary structure most important
  2. Globular Proteins
    1. Performs metabolic functions as Organic catalysts or Enzymes
    2. Tertiary structure most important
    3. Irregular sequence of amino acid
      1. Highly specific & never varies
    4. Polypeptide chains are tightly folded
    5. Held in configurations by H bonds and other cohesive forces
      1. Forms spherical molecules
    6. Relative unstable structure
      1. Can be denatured by heat, change in pH etc.
    7. Relatively soluble, readily forms colloidal suspension
    8. Polypeptide Chains are folded such that surface of enzyme have depressions
      1. Specific sites into which other molecules fit in
    9. Examples
      1. Enzymes
      2. Antibodies
      3. Hormones
      4. Haemoglobin
3. 4 levels of protein structure
  1. Primary
    1. Peptide Linkage
      1. H at Carbonyl end w/ OH at Amino end
  2. Secondary
    1. H-Bonds
      1. B/w 1st & 5th Peptide Linkage
      2. Leads to folding of polypeptide chains
      3. Alpha Helix
      4. Beta pleated sheets
  3. Tertiary
  4. Quaternary
Lipids
Carbohydrates

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	Criado por jeffcheng98 quase 11 anos atrás