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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Biophys+J 2014 ; 107 (1): 100-13 Nephropedia Template TP
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The Extracellular ?-Domain is Essential for the Formation of CD81 Tetraspanin Webs #MMPMID24988345
Homsi Y; Schloetel JG; Scheffer K; Schmidt T; Destainville N; Florin L; Lang T
Biophys J 2014[Jul]; 107 (1): 100-13 PMID24988345show ga
CD81 is a ubiquitously expressed member of the tetraspanin family. It forms large molecular platforms, so-called tetraspanin webs that play physiological roles in a variety of cellular functions and are involved in viral and parasite infections. We have investigated which part of the CD81 molecule is required for the formation of domains in the cell membranes of T-cells and hepatocytes. Surprisingly, we find that large CD81 platforms assemble via the short extracellular ?-domain, independent from a strong primary partner binding and from weak interactions mediated by palmitoylation. The ?-domain is also essential for the platforms to function during viral entry. We propose that, instead of stable binary interactions, CD81 interactions via the small ?-domain, possibly involving a dimerization step, play the key role in organizing CD81 into large tetraspanin webs and controlling its function.