cAMP Kinase A
 
  Catalytic subunit in active conformation.
 
Protein kinase A (PKA) refers to a family of enzymes whose activity is dependent on the level of cyclic AMP (cAMP) in the cell.
       [low cAMP levels result in an inactive PKA]
       [high cAMP levels result in an active PKA]

PKA is also known as cAMP-dependent protein kinase EC (2.7.11.11) is a  quarternary holoenzyme made of
        2 Regulatory   &   2 Catalytic subunits.
 
          PKA

Protein kinase A has several functions in the cell, including regulation of glycogen, sugar, and lipid metabolism via transfer of terminal P on ATP  to
SER on proteins...    
                animation of action*               protein   --PKA + ATP --> protein-Ser-P  +  ADP
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