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Fig. 2. Parallels between the signaling pathways of Prod1 and the urokinase
plasminogen activator receptor. Prod1 is a salamander three-finger protein
with a GPI anchor and a secreted protein ligand, nAG. The mammalian urokinase
plasminogen activator receptor (PLAUR; uPAR) is also GPI-linked and has 3
three-finger domains. Both proteins can activate the MAP kinase pathway
(ERK/MAPK) by interacting with the EGF receptor, and can activate
transcription of the matrix metalloprotease MMP9, which is an early player in
limb regeneration. Putative interactions are indicated by question marks.
Image courtesy of Jeremy Brockes.
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