Journal
JOURNAL OF CELL BIOLOGY
Volume 150, Issue 4, Pages 755-769Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.150.4.755
Keywords
integral membrane protein; storage protein; prevacuolar compartment; autophagy; RING-H2
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We identify new organelles associated with the vacuolar system in plant cells. These organelles are defined biochemically by their internal content of three integral membrane proteins: a chimeric reporter protein that moves there directly from the ER; a specific tonoplast intrinsic protein; and a novel receptor-like RING-H2 protein that traffics through the Golgi apparatus. Highly conserved homologues of the latter are expressed in animal cells. In a developmentally regulated manner, the organelles are taken up into vacuoles where, in seed protein storage vacuoles, they form a membrane-containing crystalloid, The uptake and preservation of the contents of these organelles in vacuoles represents a unique mechanism for compartmentalization of protein and lipid for storage.
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