(also called cori ester
) is a glucose
molecule with a phosphate
group on the 1'-carbon.
, it is the direct product of the reaction in which glycogen phosphorylase
cleaves off a molecule
from a greater glycogen
To be utilized in cellular catabolism it must first be converted to glucose 6-phosphate by the enzyme phosphoglucomutase. One reason that cells form glucose-1-phosphate instead of glucose during glycogen breakdown is that the very polar phosphorylated glucose cannot leave the cell membrane and so is marked for intracellular catabolism.
, free glucose 1-phosphate can also react with UTP
to form UDP-glucose
, by using the enzyme UDP-glucose pyrophosphorylase
. It can then return to the greater glycogen structure via glycogen synthase