CONSERVED ENERGETIC STATES – Rapid cellular energy buffers

• phosphocreatine
• phosphoarginine
• other phosphagens
• rapidly reversible ion or redox pools

Operational definition

Short-timescale energetic pool.

Reversible molecular or electrochemical pools that absorb brief mismatches between energy production and demand while stabilizing ATP, redox state, or membrane potential.

Examples include:

• phosphocreatine;
• phosphoarginine;
• other phosphagens;
• rapidly reversible redox pools;
• short-lived ion-gradient reserves.

Their defining feature is rapid turnover rather than large total storage capacity. ATP, reduced cofactors, ion gradients, thioesters, and phosphagens represent different conserved energetic functions rather than one universally interchangeable currency. (PubMed Central (PMC))