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Empty Enzyme

Enzyme ATP site

Bound Mg-ATP

Zoom in on ATP-Binding Site

Color by Interaction 
  Hydrophobic - GREEN
 Negative - RED  Positive - BLUE
  H-B Acceptor -
 H-B Donor -
 H-B Donor or Acceptor - MAGENTA

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Mg-ATP-Protein Hydrogen Bonds 
Mg-ATP-Protein Salt Bridges 

Describe the interactions of hese amino acids with the ATP ligand.

After zooming into the active site, watch how ATP might enter the ATPsite.

Away from the binding site, only the ionic interaction are effective.
Long range interactions

Final salt bridges and H-bonds