Protein Kinase A

Protein Kinase A (PKA) is an enzyme in cells that helps regulate various functions by transferring a phosphate group from ATP to specific proteins. This process, called phosphorylation, activates or deactivates proteins, influencing activities like metabolism, gene expression, and cell growth. PKA is activated when a signaling molecule called cyclic AMP (cAMP) increases inside the cell, making it a key player in how cells respond to hormones and other signals. Overall, PKA acts as a crucial mediator that helps cells adapt to their environment by modifying proteins in response to signaling cues.