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PROTEIN, Function of amino acid, :arrow_down:, inreasing hydrophobicity,…

- - - - proline
  - - - phenylalanine
      - tyrosine, weak acid
      - tryptophan
  - - - arginine
      - histidine, pKa =6.5
        
        positive charge at pH 6.0
        
        more than 6.o, neutral
      - lysine
  - - - glycine(only achiral, smallest)
      - alanine
      - valine(branched amino acid)
      - leucine (branced amino acid)
      - isolucine (branched amino acid)
  - - - aspartate
      - glutamate
    - - asparagine; amide of Asp
      - glutamine; Amide of Glu
- - - - alpha helix
        
        characteristic
        
        rigid,rod-like shape
        
        hydrogen bonding via H bond
        
        a right handed helix
        
        R-group of participating amino acids projected outward of helix
        
        some amino acid cannot form alpha helix;eg: Gly, Pro, Glu,Asp, Trp
        
        beta pleated sheet
        
        characteristics
        
        peptide strands or sheets are arranged side by side, fully etended
        
        each strand consist of amino acid residues arranged in zigzag fashion
        
        H bond
        
        parallel
        
        anti-parallel (more stable)
  - - - hydrophobic interction
      - H bonding
      - ionic bonds
  - - - chemical characteristic of amino acids
      - sequence of amino acid
      - number of amino acids
- - - - L enantiomer (clockwise)
      - D enantiomer (anticlockwise)