 The nuclear envelope allows the nucleus to control its contents , and separate them from the rest of the cytoplasm where necessary . This is important for controlling processes on either side of the nuclear membrane . In most cases where a cytoplasmic process needs to be restricted , a key participant is removed to the nucleus , where it interacts with transcription factors to downregulate the production of certain enzymes in the pathway . This regulatory mechanism occurs in the case of glycolysis , a cellular pathway for breaking down glucose to produce energy . Hexokinase is an enzyme responsible for the first the step of glycolysis , forming glucose @-@ 6 @-@ phosphate from glucose . At high concentrations of fructose @-@ 6 @-@ phosphate , a molecule made later from glucose @-@ 6 @-@ phosphate , a regulator protein removes hexokinase to the nucleus , where it forms a transcriptional repressor complex with nuclear proteins to reduce the expression of genes involved in glycolysis . 
 The nuclear envelope <a href='uninflect' title='1'><mark>allows</mark></a> the nucleus to control its contents , and separate them from the rest of the cytoplasm where necessary . This <a href='drop_aux' title='2'><mark>is</mark></a>important for controlling processes on either side of the nuclear membrane . In most cases where a cytoplasmic process <a href='uninflect' title='3'><mark>needs</mark></a> to be restricted , a key participant is removed to the nucleus , where it <a href='uninflect' title='4'><mark>interacts</mark></a> with transcription factors to downregulate the production of certain enzymes in the pathway . This regulatory mechanism <a href='uninflect' title='5'><mark>occurs</mark></a> in the case of glycolysis , a cellular pathway for breaking down glucose to produce energy . Hexokinase <a href='drop_aux' title='6'><mark>is</mark></a>an enzyme responsible for the first the step of glycolysis , forming glucose @-@ 6 @-@ phosphate from glucose . At high concentrations of fructose @-@ 6 @-@ phosphate , a molecule made later from glucose @-@ 6 @-@ phosphate , a regulator protein removes hexokinase to the nucleus , where it <a href='uninflect' title='7'><mark>forms</mark></a> a transcriptional repressor complex with nuclear proteins to reduce the expression of genes involved in glycolysis . 
The nuclear envelope allow the nucleus to control its contents , and separate em from da rest of tdacytoplasm where necessary . This important for controlling processes on either side of thdauclear membrane . In most cases where a cytoplasmic process gotta be restricted , a key participant is removed to the nucleus , where it interact with transcription factors to downregulate thedaoduction of certain enzymes in the pathway . dis regulatory mechanism occur in the dae of glycolysis , a cellular pathway fir breaking down glucose to produce energy . Hexokinase an enzyme responsible fir the first the step of glycolysis , forming glucose @-@ 6 @-@ phosphate from glucose . At high concentrations of fructose @-@ 6 @-@ phosphate , a molecule made later from glucose @-@ 6 @-@ phosphate , a regulator protein removes hexokinase to the nucleus , where it form a transcriptional repressor complex witt nuclear proteins to reduce the edaession of genes involved in glycolysis .