# GTP ___ **Guanosine triphophate**, or GDP, is a [[nucleotide]] that binds to and [[enzyme regulation|regulates]] to so-called "g proteins". It is similar in structure to ATP, having three [[functional group#Biologically Important Functional Groups|phosphates]] which have a high [[energy#Potential Energy|potential energy]]. ## GDP **Guanosine diphophate**, or GDP, is GTP that has had it's third phosphate removed. It therefore has much less [[energy#^potential|potential energy]]. ___