Unc119 Reference Search Result - Rat Genome Database

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RGD ID	Title	Citation	Abstract	PubMed	Pub Date
11561748	Structural basis for Arl3-specific release of myristoylated ciliary cargo from UNC119.	Ismail SA, etal., EMBO J. 2012 Oct 17;31(20):4085-94. doi: 10.1038/emboj.2012.257. Epub 2012 Sep 7.	Access to the ciliary membrane for trans-membrane or membrane-associated proteins is a regulated process. Previously, we have shown that the closely homologous small G proteins Arl2 and Arl3 allosterically regulate prenylated cargo release from PDEdelta. UNC119/ ... (more) HRG4 is responsible for ciliary delivery of myristoylated cargo. Here, we show that although Arl3 and Arl2 bind UNC119 with similar affinities, only Arl3 allosterically displaces cargo by accelerating its release by three orders of magnitude. Crystal structures of Arl3 and Arl2 in complex with UNC119a reveal the molecular basis of specificity. Contrary to previous structures of GTP-bound Arf subfamily proteins, the N-terminal amphipathic helix of Arl3.GppNHp is not displaced by the interswitch toggle but remains bound on the surface of the protein. Opposite to the mechanism of cargo release on PDEdelta, this induces a widening of the myristoyl binding pocket. This leads us to propose that ciliary targeting of myristoylated proteins is not only dependent on nucleotide status but also on the cellular localization of Arl3.	22960633	2012-11-01
8553320	Photoreceptor synaptic protein HRG4 (UNC119) interacts with ARL2 via a putative conserved domain.	Kobayashi A, etal., FEBS Lett. 2003 Jan 16;534(1-3):26-32.	Human retinal gene 4 (HRG4) (UNC119) is a photoreceptor synaptic protein of unknown function, shown when mutated to cause retinal degeneration in a patient and in a confirmatory transgenic model. ADP-ribosylation factor-like protein 2 (ARL2) was identified as an ... (more) interactor of HRG4 by the yeast two-hybrid strategy. The presence of ARL2 in the retina and co-localization with HRG4 was confirmed by Western blot and double immunofluorescence analysis, respectively. The interaction of ARL2 with HRG4 was further confirmed by co-immunoprecipitation and direct binding analysis. Phosphodiesterase delta (PDEdelta) is an ARL2-binding protein homologous to HRG4. Amino acid residues of PDEdelta involved in binding ARL2 and forming a hydrophobic pocket were shown to be highly conserved in HRG4, suggesting similarity in binding mechanism and function.	12527357	2003-05-01
598118279	HRG4 (UNC119) mutation found in cone-rod dystrophy causes retinal degeneration in a transgenic model.	Kobayashi A, etal., Invest Ophthalmol Vis Sci. 2000 Oct;41(11):3268-77.	PURPOSE: To investigate the function and pathogenicity of HRG4, a photoreceptor synaptic protein homologous to the Caenorhabditis elegans neuroprotein UNC119. METHODS: HRG4 was screened for mutations in patients with various retinopathies, a ... (more) nd a transgenic mouse model was constructed and analyzed based on a mutation found. RESULTS: A heterozygous premature termination codon mutation was found in a 57-year-old woman with late-onset cone-rod dystrophy. In some transgenic mice carrying the identical mutation, age-dependent fundus lesions developed accompanied by electroretinographic changes consistent with defects in photoreceptor synaptic transmission (depressed b-wave, normal c-wave), and retinal degeneration occurred with marked synaptic and possible transsynaptic degeneration. CONCLUSIONS: HRG4, the only synaptic protein known to be highly enriched in photoreceptor ribbon synapses, is now shown to be pathogenic when mutated.	11006213	2000-10-01