GRASPing Unconventional Secretion

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GRASPing Unconventional Secretion Stephanie K. Levi, Benjamin S. Glick  Cell  Volume 130, Issue 3, Pages 407-409 (August 2007) DOI: 10.1016/j.cell.2007.07.030 Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 1 GrpA in Unconventional Secretion The figure shows a hypothetical pathway for unconventional secretion in Dictyostelium. Cytosolic AcbA is packaged into the internal vesicles of multivesicular bodies (MVBs), which subsequently fuse with the plasma membrane to release exosomes containing AcbA. Shown are two possible roles for GrpA in this pathway. (A) GrpA shuttles through the cytosol between the Golgi and the plasma membrane and has distinct functions at the two locations. At the plasma membrane, GrpA acts as part of the MVB fusion machinery. (B) GrpA functions exclusively at the Golgi, where it is required for the biosynthetic transport of a select set of cargo molecules. One such cargo molecule is a plasma membrane protein required for MVB fusion. Cell 2007 130, 407-409DOI: (10.1016/j.cell.2007.07.030) Copyright © 2007 Elsevier Inc. Terms and Conditions