Protein Kinase Reactions: Serves as the phosphate donor in phosphorylation assays for serine/threonine and tyrosine kinases.

ATPase Activity Assays: Substrate for enzymes that hydrolyze ATP, including helicases, motor proteins, and chaperones.

DNA Ligation: Required cofactor for T4 DNA ligase in cloning and adapter ligation workflows.

Polynucleotide Kinase Labeling: Provides ATP for T4 PNK to phosphorylate 5' ends or transfer radiolabel from γ-ATP.

Luciferase Bioluminescence Assays: Substrate/standard for firefly luciferase-based ATP quantification and cell viability readouts.

In Vitro Transcription/Translation: Energy source in cell-free expression systems with ATP regeneration mixes.

Molecular Motor Studies: Powers myosin, kinesin, and dynein motility assays and actin-myosin contractility tests.

Chaperone and Proteasome Assays: Supports Hsp70/Hsp90 cycling and 26S proteasome-dependent protein degradation.

ABC Transporter Experiments: Drives ATP-dependent substrate transport in reconstituted membrane systems.

Complex Dissociation/Elution: Used to release ATP-dependent chaperone-bound proteins during immunoprecipitation workflows.