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Ubiquitin-independent function of optineurin in autophagic clearance of protein aggregates (CROSBI ID 202320)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Korać, Jelena ; Schaeffer, Veronique ; Kovačević, Igor ; Clement, Albrecht M. ; Jungblut, Benno ; Behl, Christian ; Terzić, Janos ; Đikić, Ivan Ubiquitin-independent function of optineurin in autophagic clearance of protein aggregates // Journal of cell science, 15 (2012), 126; 580-592. doi: 10.1242/jcs.114926

Podaci o odgovornosti

Korać, Jelena ; Schaeffer, Veronique ; Kovačević, Igor ; Clement, Albrecht M. ; Jungblut, Benno ; Behl, Christian ; Terzić, Janos ; Đikić, Ivan

engleski

Ubiquitin-independent function of optineurin in autophagic clearance of protein aggregates

Aggregation of misfolded proteins and the associated loss of neurons are considered a hallmark of numerous neurodegenerative diseases. Optineurin is present in protein inclusions observed in various neurodegenerative diseases including amyotrophic lateral sclerosis (ALS), Huntington’s disease, Alzheimer’s disease, Parkinson’s disease, Creutzfeld-Jacob disease and Pick’s disease. Optineurin deletion mutations have also been described in ALS patients. However, the role of optineurin in mechanisms of protein aggregation remains unclear. In this report, we demonstrate that optineurin recognizes various protein aggregates via its C-terminal coiled-coil domain in a ubiquitin-independent manner. We also show that optineurin depletion significantly increases protein aggregation in HeLa cells and that morpholino-silencing of the optineurin ortholog in zebrafish causes the motor axonopathy phenotype similar to a zebrafish model of ALS. A more severe phenotype is observed when optineurin is depleted in zebrafish carrying ALS mutations. Furthermore, TANK1 binding kinase 1 (TBK1) is colocalized with optineurin on protein aggregates and is important in clearance of protein aggregates through the autophagy-lysosome pathway. TBK1 phosphorylates optineurin at serine 177 and regulates its ability to interact with autophagy modifiers. This study provides evidence for a ubiquitin-independent function of optineurin in autophagic clearance of protein aggregates as well as additional relevance for TBK1 as an upstream regulator of the autophagic pathway.

amyotrophic lateral sclerosis; Huntington disease; Huntingtin; optineurin; phosphorylation; SOD1; TBK1; ubiquitin

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Podaci o izdanju

15 (126)

2012.

580-592

objavljeno

0021-9533

10.1242/jcs.114926

Povezanost rada

Temeljne medicinske znanosti, Biologija

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