Katsumata O, Kimura T, Nagatsuka Y, Hirabayashi Y, Sugiya H, Furuyama S, Yanagishita M, Hara-Yokoyama M. Charge-based separation of detergent-resistant membranes of mouse splenic B cells.
Biochem Biophys Res Commun 2004;
319:826-31. [PMID:
15184057 DOI:
10.1016/j.bbrc.2004.05.058]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2004] [Indexed: 02/04/2023]
Abstract
Current biochemical characterization for cholesterol- and glycolipid-rich membrane microdomains largely depends on analysis of detergent-resistant membranes (DRMs). In the present study, we succeeded in separation of DRMs of similar density-based on their electrical charge using free-flow electrophoresis (FFE). After crosslinking of B cell receptor (BCR), mouse splenic B cells were lysed with 1% Brij-58 and the resulting lysate was subjected to sucrose density gradient ultracentrifugation. The low-density fraction that recovered a part of DRMs containing IgM together with those enriched in GM1a, the Src family protein tyrosine kinase Lyn, and the alpha subunit of inhibitory heterotrimeric GTP-binding protein was further resolved by FFE. FFE separated the former into more cathodally deflected fractions than the latter. In addition, FFE revealed an anodal shift of DRMs containing a transmembrane protein CD38 upon BCR-crosslinking. The results demonstrate the effectiveness of FFE for the charge-based separation of DRMs.
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