Lee Seol-Ae, Kim Seong-Mo, Suh Bo Kyoung, Sun Hwa-Young, Park Young-Un, Hong Ji-Ho, Park Cana, Nguyen Minh Dang, Nagata Koh-Ichi, Yoo Joo-Yeon, Park Sang Ki
From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
the Hotchkiss Brain Institute, Departments of Clinical Neurosciences, Cell Biology and Anatomy, and Biochemistry and Molecular Biology, University of Calgary, Calgary T2N 4N1, Canada, and.
J Biol Chem. 2015 Mar 13;290(11):7087-96. doi: 10.1074/jbc.M114.614750. Epub 2015 Jan 29.
Dysbindin and DISC1 are schizophrenia susceptibility factors playing roles in neuronal development. Here we show that the physical interaction between dysbindin and DISC1 is critical for the stability of dysbindin and for the process of neurite outgrowth. We found that DISC1 forms a complex with dysbindin and increases its stability in association with a reduction in ubiquitylation. Furthermore, knockdown of DISC1 or expression of a deletion mutant, DISC1 lacking amino acid residues 403-504 of DISC1 (DISC1(Δ403-504)), effectively decreased levels of endogenous dysbindin. Finally, the neurite outgrowth defect induced by knockdown of DISC1 was partially reversed by coexpression of dysbindin. Taken together, these results indicate that dysbindin and DISC1 form a physiologically functional complex that is essential for normal neurite outgrowth.
失调结合蛋白(dysbindin)和精神分裂症相关基因1(DISC1)是在神经元发育过程中发挥作用的精神分裂症易感因素。在此我们表明,失调结合蛋白与DISC1之间的物理相互作用对于失调结合蛋白的稳定性以及神经突生长过程至关重要。我们发现,DISC1与失调结合蛋白形成复合物,并通过减少泛素化作用来提高其稳定性。此外,敲低DISC1或表达缺失氨基酸残基403 - 504的DISC1缺失突变体(DISC1(Δ403 - 504)),可有效降低内源性失调结合蛋白的水平。最后,通过共表达失调结合蛋白,部分逆转了敲低DISC1所诱导的神经突生长缺陷。综上所述,这些结果表明,失调结合蛋白与DISC1形成了一种对正常神经突生长必不可少的生理功能复合物。