Mind bomb-2 is an E3 ligase for Notch ligand - PubMed (original) (raw)
. 2005 Jun 10;280(23):22335-42.
doi: 10.1074/jbc.M501631200. Epub 2005 Apr 11.
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- PMID: 15824097
- DOI: 10.1074/jbc.M501631200
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Mind bomb-2 is an E3 ligase for Notch ligand
Bon-Kyoung Koo et al. J Biol Chem. 2005.
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Abstract
The zebrafish gene, mind bomb (mib), encodes a protein that positively regulates of the Delta-mediated Notch signaling. It interacts with the intracellular domain of Delta to promote its ubiquitination and endocytosis. In our search for the mouse homologue of zebrafish mind bomb, we cloned two homologues in the mouse genome: a mouse orthologue (mouse mib1) and a paralogue, named mind bomb-2 (mib2), which is evolutionarily conserved from Drosophila to human. Both Mib1 and Mib2 have an E3 ubiquitin ligase activity in their C-terminal RING domain and interact with Xenopus Delta (XD) via their N-terminal region. Mib2 is also able to ligate ubiquitin to XD and shift the membrane localization of Delta to intracellular vesicles. Importantly, Mib2 rescues both the neuronal and vascular defects in the zebrafish mib(ta52b) mutants. In contrast to the functional similarities between Mib1 and Mib2, mib2 is highly expressed in adult tissues, but almost not at all in embryos, whereas mib1 is abundantly expressed in both embryos and adult tissues. These data suggest that Mib2 has functional similarities to Mib1, but might have distinct roles in Notch signaling as an E3 ubiquitin ligase.
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