• ISSN 1674-8301
  • CN 32-1810/R
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Meihen Sun, Xu Han, Fei Chang, Hongfei Xu, Lesley Colgan, Yongjian Liu. Regulatory role of sorting nexin 5 in protein stability and vesicular targeting of vesicular acetylcholine transporter to synaptic vesicle-like vesicles in PC12 cells[J]. The Journal of Biomedical Research. doi: 10.7555/JBR.34.20200095
Citation: Meihen Sun, Xu Han, Fei Chang, Hongfei Xu, Lesley Colgan, Yongjian Liu. Regulatory role of sorting nexin 5 in protein stability and vesicular targeting of vesicular acetylcholine transporter to synaptic vesicle-like vesicles in PC12 cells[J]. The Journal of Biomedical Research. doi: 10.7555/JBR.34.20200095

Regulatory role of sorting nexin 5 in protein stability and vesicular targeting of vesicular acetylcholine transporter to synaptic vesicle-like vesicles in PC12 cells

doi: 10.7555/JBR.34.20200095
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  • Corresponding author: Yongjian Liu, Jiangsu Key Laboratory of Xenotransplantation, and Department of Medical Genetics, Nanjing Medical University, Nanjing, Jiangsu 211166, China. Tel: +86-25-86869442, E-mail: young.liu78@gmail.com; Lesley Colgan, Max Planck Florida Institute for Neuroscience, Jupiter, FL 33458, USA. Tel: +1-561-972-9210, E-mail: lesley.col gan@nufi.org
  • Received: 2020-06-17
  • Revised: 2020-06-19
  • Accepted: 2020-06-19
  • Published: 2020-08-21
  • Accurate targeting of vesicular acetylcholine transporter (VAChT) to synaptic vesicles (SVs) is indispensable for efficient cholinergic transmission. Previous studies have suggested that the dileucine motif within the C-terminus of the transporter is sufficient for its targeting to SVs. However, the cytosolic machinery underlying specific regulation of VAChT trafficking and targeting to SVs is still unclear. Here we used the C-terminus of VAChT as a bait in a yeast two-hybrid screen to identify sorting nexin 5 (SNX5) as its novel interacting protein. SNX5 was detected in the SVs enriched LP2 subcellular fraction of rat brain homogenate and showed strong colocalization with VAChT in both brain sections and PC12 cells. Binding assays suggested that the C-terminal domain of VAChT can interact with both BAR and PX domain of SNX5. Depletion of SNX5 enhanced the degradation of VAChT and the process was mediated through the lysosomal pathway. More importantly, we found that, in PC12 cells, the depletion of SNX5 expression significantly decreased the synaptic vesicle-like vesicles (SVLVs) localization of VAChT. Therefore, the results suggest that SNX5 is a novel regulator for both stability and SV targeting of VAChT.

     

  • △ These authors contributed equally to this work
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