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Cell Mol Biol (Noisy-le-grand). 2004 Mar;50(2):171-7.

Band 3 is a target protein of spectrin's E2/E3 activity: implication for sickle cell disease and normal red blood cell aging.

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Department of Molecular and Cell Biology, UTD Sickle Cell Disease Research Center, Institute of Biomedical Sciences and Technology, The University of Texas at Dallas, Richardson, TX 75083, USA.


We have demonstrated that a 125 kDa red blood cell (RBC) membrane protein, being a target of spectrin's E2/E3 activity, is ubiquitinated band 3. This demonstration was based on copurification of this biotinylated-ubiquitinated protein with band 3, immunoprecipitation with band 3 antibody and analysis of proteins associated with strepavidin sepharose by micro liquid chromatography coupled to tandem mass spectrometry (microLC/MS/MS). Further, we demonstrated the presence of ubiquitinated band 3 in vivo by Western blotting of purified band 3 with a monoclonal antibody (FK2) against ubiquitin. The implications of these results for sickle cell disease and RBC aging are discussed.

[Indexed for MEDLINE]

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