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|a DiChiara, Andrew Stephen
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|a Massachusetts Institute of Technology. Department of Chemistry
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|a Koch Institute for Integrative Cancer Research at MIT
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|a DiChiara, Andrew Stephen
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|a Taylor, Rebecca J.
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|a Wong, Madeline Y.
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|a Doan, Ngoc Duc
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|a Del Rosario, Amanda M
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|a Shoulders, Matthew D.
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|a Taylor, Rebecca J.
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|a Wong, Madeline Y.
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|a Doan, Ngoc Duc
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|a Del Rosario, Amanda M
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|a Shoulders, Matthew D.
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|a Mapping and Exploring the Collagen-I Proteostasis Network
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|b American Chemical Society (ACS),
|c 2018-02-12T16:15:03Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/113577
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|a Collagen-I is the most abundant protein in the human body, yet our understanding of how the endoplasmic reticulum regulates collagen-I proteostasis (folding, quality control, and secretion) remains immature. Of particular importance, interactomic studies to map the collagen-I proteostasis network have never been performed. Such studies would provide insight into mechanisms of collagen-I folding and misfolding in cells, an area that is particularly important owing to the prominence of the collagen misfolding-related diseases. Here, we overcome key roadblocks to progress in this area by generating stable fibrosarcoma cells that inducibly express properly folded and modified collagen-I strands tagged with distinctive antibody epitopes. Selective immunoprecipitation of collagen-I from these cells integrated with quantitative mass spectrometry-based proteomics permits the first mapping of the collagen-I proteostasis network. Biochemical validation of the resulting map leads to the assignment of numerous new players in collagen-I proteostasis, and the unanticipated discovery of apparent aspartyl-hydroxylation as a new post-translational modification in the N-propeptide of collagen-I. Furthermore, quantitative analyses reveal that Erp29, an abundant endoplasmic reticulum proteostasis machinery component with few known functions, plays a key role in collagen-I retention under ascorbate-deficient conditions. In summary, the work here provides fresh insights into the molecular mechanisms of collagen-I proteostasis, y ielding a detailed roadmap for future investigations. Straightforward adaptations of the cellular platform developed will also enable hypothesis-driven, comparative research on the likely distinctive proteostasis mechanisms engaged by normal and disease-causing, misfolding collagen-I variants, potentially motivating new therapeutic strategies for currently incurable collagenopathies.
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|a National Institute of Arthritis and Musculoskeletal and Skin Diseases (U.S.) (Grant 1R03AR067503)
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|a National Institute of Arthritis and Musculoskeletal and Skin Diseases (U.S.) (Grant 1F31AR067615)
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|a National Institute of Environmental Health Sciences (Grant P30-ES002109)
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|a Article
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|t ACS Chemical Biology
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