[Adenylate cyclase from rabbit heart: substrate binding site]

Area of Science:

• Biochemistry
• Enzymology

Context:

• Adenylate cyclase is a crucial enzyme in cellular signaling.
• Understanding its active site is key to developing targeted therapeutics.

Purpose:

• To investigate the structure-activity relationships of ATP analogs as inhibitors of rabbit heart adenylate cyclase.
• To elucidate the binding requirements of the enzyme's active site.

Summary:

• 17 ATP analogs with modifications to the triphosphate chain, adenine base (position 8), or ribose were tested.
• Most analogs acted as competitive, reversible inhibitors, highlighting the triphosphate chain's importance for binding.
• Modifications at position 8 of the adenine base resulted in low enzyme affinity.

Impact:

• Provides insights into the molecular interactions governing adenylate cyclase activity.
• Informs the design of novel enzyme inhibitors for potential therapeutic applications.