Phosphocreatine, also known as creatine phosphate or PCr, is a phosphorylated creatine molecule that is an important energy store in skeletal muscle. It is used to generate ATP from ADP, forming creatine for the 2 to 7 seconds following an intense effort. This reaction is reversible and it therefore acts as a spatial and temporal buffer of ATP concentration. Phosphocreatine plays a particularly important role in tissues that have high, fluctuating energy demands such as muscle and brain.

References:

Schlattner, U., Tokarska-Schlattner, M., Wallimann, T. (2005). Mitochondrial creatine kinase in human health and disease. Biochemica et Biophysica Acta .27. (Published ahead of print).

Phosphocréatine | Creatinfosfato | Fosfokreatyna