Erythrocyte band 3 protein strongly interacts with phosphoinositides.
85% of the phosphorus coisolated with band 3 protein during separation of the intrinsic proteins of the human erythrocyte membrane by zonal electrophoresis in high concentrations of acetic acid was found to be derived from phosphoinositides, mainly phosphatidylinositol 4,5-bisphosphate. When native band 3 protein and pyrene-labelled phospholipids were present in micelles of the nonionic detergent nonaethyleneglycol lauryl ether, strong resonance energy transfer was observed between the tryptophan residues and phosphatidylinositol 4,5-bisphosphate and, to a smaller degree, phosphatidylinositol 4-phosphate. We conclude that band 3 protein strongly interacts with phosphoinositides, in particular with phosphatidylinositol 4,5-bisphosphate.
Biophysics Institute, J.W. Goethe University, Frankfurt am Main, Germany.
A
A
Hanicak
D
D
Maretzki
B
B
Reimann
E
E
Pap
A J
AJ
Visser
K W
KW
Wirtz
D
D
Schubert
D001457:Anion Exchange Protein 1, Erythrocyte / Q000378:metabolism*; D003902:Detergents; D004734:Energy Metabolism; D004910:Erythrocyte Membrane / Q000378:metabolism; D006801:Humans; D008563:Membrane Lipids / Q000378:metabolism; D008823:Micelles; D010716:Phosphatidylinositols / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism
D001457:Anion Exchange Protein 1, Erythrocyte; D003902:Detergents; D008563:Membrane Lipids; D008823:Micelles; D010716:Phosphatidylinositols; D010743:Phospholipids