Notch receptors are clustered and trans-endocytosed by Delta ligand cells. Confocal micrograph of a Delta expressing cell (left) interacting with a Notch expressing cell (right). Following interaction with Delta (blue), cell surface Notch (yellow) is clustered at cell-cell interfaces. Notch extracellular domain is detected within Delta cells (green) indicative of trans-endocytosis. Endocytosis of ligand while bound to Notch may produce a force sufficient to pull Notch apart and activate signaling.
 
 
 
 
 
 

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Volume 8 issue 5 May 2007
Evidence for a direct role of the Doa4 deubiquitinating enzyme in protein sorting into
the MVB pathway

E Nikko  and B André

Figure 1: Gap1 was detected by Western blotting in total protein extracts prepared before (t = 0 min) and at the indicated times after addition of NH4+. Strains and growth conditions were as in Fig. 5A.

Figure 1 (jpg)

Figure 2: Upper part. Gap1 activity was measured before (t = 0 min) and at several times after 20mM NH4+-addition, as in Fig. 1B, in wild-type (23344c, ■) and snƒ7Δ cells(ME029, □), and in snƒ7Δ cells transformed with the ubiquitin-gene-bearing YEp96 plasmid (Ο) and overproducing ubiquitin by addition of CuSO4 (100 µM) to the medium. Bottom part. As in the upper figure, except that vps4Δcells (ME27) were used instead of snƒ7Δ cells.

Figure 2 (jpg)

Figure 3: Gap1 was detected by Western blotting in total protein extracts prepared before (t = 0 min) and at the indicated times after addition of NH4+. Strains and growth conditions were as in Fig. 5A.

Figure 3 (jpg)

Figure 4: Gap1 was detected by Western blotting in total protein extracts prepared before (t = 0 min) and at the indicated times after addition of NH4+. Strains and growth conditions were as in Fig. 5A.

Figure 4 (jpg)

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