The regulation of sucrose phosphorylase can also be used to explain its function in terms of energy consumption and preservation. The cAMP-CRP complex that enhances transcription of the sucrose phosphorylase gene (Reid and Abratt 2003) is only present when glucose levels are low. The purpose of sucrose phosphorylase, therefore, can be linked to the need for higher glucose levels, created through its reaction. The fact that glucose acts as a feedback inhibitor to prevent the formation of sucrose phosphorylase further supports its catalytic role in the creation of glucose for energy use or storage.