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© Research
Publication : International journal of medical microbiology : IJMM

Detergent-resistant membrane microdomains and apical sorting of GPI-anchored proteins in polarized epithelial cells

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in International journal of medical microbiology : IJMM - 01 Feb 2002

Paladino S, Sarnataro D, Zurzolo C

Link to Pubmed [PMID] – 11890542

Int. J. Med. Microbiol. 2002 Feb;291(6-7):439-45

Detergent-insoluble microdomains or rafts play a crucial role in many cellular functions: membrane traffic, cell signalling and human diseases. In this work we investigate the role of rafts in the sorting of GPI-anchored proteins in polarized epithelial cells. In contrast to MDCK cells, the majority of endogenous GPI-anchored proteins are sorted to the basolateral surface of Fischer rat thyroid cells (Zurzolo et al., J. Cell Biol. 121, 1031-1039, 1993). We analyzed a set of transfected GPI proteins in order to understand the role of the GPI anchor and of association with rafts for apical sorting. We found that the GPI moiety is necessary but not sufficient for apical sorting of GPI proteins and that the ectodomain has a major role. We propose a new model in which the stabilization of proteins into rafts, probably mediated by interactions between protein ectodomains and a putative receptor, plays a crucial role in apical sorting.

http://www.ncbi.nlm.nih.gov/pubmed/11890542