Structural highlights
Function
[LNX1_MOUSE] E3 ubiquitin-protein ligase that mediates ubiquitination and subsequent proteasomal degradation of NUMB. E3 ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Mediates ubiquitination of isoform p66 and isoform p72 of NUMB, but not that of isoform p71 or isoform p65. Isoform 2 provides an endocytic scaffold for IGSF5/JAM4. [IGSF5_MOUSE] Provides, together with MAGI1, an adhesion machinery at tight junctions, which may regulate the permeability of kidney glomerulus and small intestinal epithelial cells. Mediates calcium-independent homophilic cell adhesion. In testis, it may function as a cell adhesion molecule rather than a tight-junction protein. It may participate in the adhesion between spermatogonia-spermatogonia, spermatogonia-Sertoli cells, and Sertoli cells-Sertoli cells.[1] [2]
See Also
References
- ↑ Hirabayashi S, Tajima M, Yao I, Nishimura W, Mori H, Hata Y. JAM4, a junctional cell adhesion molecule interacting with a tight junction protein, MAGI-1. Mol Cell Biol. 2003 Jun;23(12):4267-82. PMID:12773569
- ↑ Nagamatsu G, Ohmura M, Mizukami T, Hamaguchi I, Hirabayashi S, Yoshida S, Hata Y, Suda T, Ohbo K. A CTX family cell adhesion molecule, JAM4, is expressed in stem cell and progenitor cell populations of both male germ cell and hematopoietic cell lineages. Mol Cell Biol. 2006 Nov;26(22):8498-506. Epub 2006 Sep 18. PMID:16982697 doi:10.1128/MCB.01502-06
