Journal
JOURNAL OF PROTEOMICS
Volume 123, Issue -, Pages 42-53Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jprot.2015.03.038
Keywords
Neuronal ceroid lipofuscinoses; CLN1 disease; Interactome; Affinity purification; Mass spectrometry; Palmitoyl protein thioesterase 1
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Funding
- Finnish Academy of Science [128600]
- European Union Seventh Framework Programme (FP7) [281234]
- Kliinisen kemian tutkimussaatio
- Academy of Finland (AKA) [128600, 128600] Funding Source: Academy of Finland (AKA)
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Neuronal ceroid lipofuscinoses (NCL) are a group of inherited progressive childhood disorders, characterized by early accumulation of autofluorescent storage material in lysosomes of neurons or other cells. Clinical symptoms of NCL include: progressive loss of vision, mental and motor deterioration, epileptic seizures and premature death. CLN1 disease (MIM#256730) is caused by mutations in the CLN1 gene, which encodes palmitoyl protein thioesterase 1 (PPT1). In this study, we utilised single step affinity purification coupled to mass spectrometry (AP-MS) to unravel the in vivo substrates of human PPT1 in the brain neuronal cells. Protein complexes were isolated from human PPT1 expressing SH-SY5Y stable cells, subjected to filter-aided sample preparation (FASP) and analysed on a Q Exactive Hybrid Quadrupole-Orbitrap mass spectrometer. A total of 23 PPT1 interacting partners (IP) were identified from label free quantitation of the MS data by SAINT platform. Three of the identified PPT1 IP, namely CRMP1, DBH, and MAP1B are predicted to be palmitoylated. Our proteomic analysis confirmed previously suggested roles of PPT1 in axon guidance and lipid metabolism, yet implicates the enzyme in novel roles including: involvement in neuronal migration and dopamine receptor mediated signalling pathway. Biological significance The significance of this work lies in the unravelling of putative in vivo substrates of human CLN1 or PPT1 in brain neuronal cells. Moreover, the PPT1 IP implicate the enzyme in novel roles including: involvement in neuronal migration and dopamine receptor mediated signalling pathway. (C) 2015 Elsevier B.V. All rights reserved.
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