50. Production of recombinant proteins in Escherichia coli is a common tool for research and industrial production of proteins. However, during affinity column purification, DnaK, unwanted contamination, is often coeluted with proteins of interest (POI). Which of the following statements about DnaK is TRUE? (A) DnaK binds to the charged regions of the POI and ADP can dissociate the interaction of Dnak with POI. (B) DnaK binds to the hydrophobic regions of the POI and ATP can dissociate the interaction of Dnak with POI. (C) DnaK binds to the polar regions of the POI and GTP can dissociate the interaction of Dnak with POI. (D) DnaK binds to the hydrophobic regions of the POI and GTP can dissociate the interaction of Dnak with POI. (E) DnaK binds to the charged regions of the POI and ATP can dissociate the interaction of Dnak with POI.