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Global Cysteine-Reactivity Profiling during Impaired Insulin/IGF-1 Signaling in C. elegans Identifies Uncharacterized Mediators of Longevity

Martell, Julianne
Seo, Yonghak
Bak, Daniel W.
Kingsley, Samuel F.
Tissenbaum, Heidi A.
Weerapana, Eranthie
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Abstract

In the nematode Caenorhabditis elegans, inactivating mutations in the insulin/IGF-1 receptor, DAF-2, result in a 2-fold increase in lifespan mediated by DAF-16, a FOXO-family transcription factor. Downstream protein activities that directly regulate longevity during impaired insulin/IGF-1 signaling (IIS) are poorly characterized. Here, we use global cysteine-reactivity profiling to identify protein activity changes during impaired IIS. Upon confirming that cysteine reactivity is a good predictor of functionality in C. elegans, we profiled cysteine-reactivity changes between daf-2 and daf-16;daf-2 mutants, and identified 40 proteins that display a > 2-fold change. Subsequent RNAi-mediated knockdown studies revealed that lbp-3 and K02D7.1 knockdown caused significant increases in lifespan and dauer formation. The proteins encoded by these two genes, LBP-3 and K02D7.1, are implicated in intracellular fatty acid transport and purine metabolism, respectively. These studies demonstrate that cysteine-reactivity profiling can be complementary to abundance-based transcriptomic and proteomic studies, serving to identify uncharacterized mediators of C. elegans longevity.

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Cell Chem Biol. 2016 Aug 18;23(8):955-66. doi: 10.1016/j.chembiol.2016.06.015. Epub 2016 Aug 4. Link to article on publisher's site

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10.1016/j.chembiol.2016.06.015
PubMed ID
27499530
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