Could those rapidly exchangeable phosphoproteins be polyphosphate-protein complexes?
D001693:Biological Transport, Active; D001923:Brain Chemistry; D002462:Cell Membrane / Q000378:metabolism; D009474:Neurons / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism*; D010750:Phosphoproteins / Q000378:metabolism; D010756:Phosphoric Acids / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism*; D013329:Structure-Activity Relationship
D010710:Phosphates; D010750:Phosphoproteins; D010756:Phosphoric Acids; D011506:Proteins