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Phosphorylation of CHIP at Ser20 by Cdk5 Promotes TAIF-mediated Neuronal Death

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Specialty Cell Biology
Date 2015 Jul 25
PMID 26206088
Citations 18
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Abstract

Cyclin-dependent kinase 5 (Cdk5) is a proline-directed serine/threonine kinase and its dysregulation is implicated in neurodegenerative diseases. Likewise, C-terminus of Hsc70-interacting protein (CHIP) is linked to neurological disorders, serving as an E3 ubiquitin ligase for targeting damaged or toxic proteins for proteasomal degradation. Here, we demonstrate that CHIP is a novel substrate for Cdk5. Cdk5 phosphorylates CHIP at Ser20 via direct binding to a highly charged domain of CHIP. Co-immunoprecipitation and ubiquitination assays reveal that Cdk5-mediated phosphorylation disrupts the interaction between CHIP and truncated apoptosis-inducing factor (tAIF) without affecting CHIP's E3 ligase activity, resulting in the inhibition of CHIP-mediated degradation of tAIF. Lentiviral transduction assay shows that knockdown of Cdk5 or overexpression of CHIP(S20A), but not CHIP(WT), attenuates tAIF-mediated neuronal cell death induced by hydrogen peroxide. Thus, we conclude that Cdk5-mediated phosphorylation of CHIP negatively regulates its neuroprotective function, thereby contributing to neuronal cell death progression following neurotoxic stimuli.

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References
1.
Skowyra D, Craig K, Tyers M, Elledge S, Harper J . F-box proteins are receptors that recruit phosphorylated substrates to the SCF ubiquitin-ligase complex. Cell. 1997; 91(2):209-19. DOI: 10.1016/s0092-8674(00)80403-1. View

2.
Gong X, Tang X, Wiedmann M, Wang X, Peng J, Zheng D . Cdk5-mediated inhibition of the protective effects of transcription factor MEF2 in neurotoxicity-induced apoptosis. Neuron. 2003; 38(1):33-46. DOI: 10.1016/s0896-6273(03)00191-0. View

3.
Ballinger C, Connell P, Wu Y, Hu Z, Thompson L, Yin L . Identification of CHIP, a novel tetratricopeptide repeat-containing protein that interacts with heat shock proteins and negatively regulates chaperone functions. Mol Cell Biol. 1999; 19(6):4535-45. PMC: 104411. DOI: 10.1128/MCB.19.6.4535. View

4.
Cheung E, Melanson-Drapeau L, Cregan S, Vanderluit J, Ferguson K, McIntosh W . Apoptosis-inducing factor is a key factor in neuronal cell death propagated by BAX-dependent and BAX-independent mechanisms. J Neurosci. 2005; 25(6):1324-34. PMC: 6726004. DOI: 10.1523/JNEUROSCI.4261-04.2005. View

5.
Shin Y, Klucken J, Patterson C, Hyman B, McLean P . The co-chaperone carboxyl terminus of Hsp70-interacting protein (CHIP) mediates alpha-synuclein degradation decisions between proteasomal and lysosomal pathways. J Biol Chem. 2005; 280(25):23727-34. DOI: 10.1074/jbc.M503326200. View