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- W2007602308 abstract "The APS adapter protein plays a pivotal role in coupling the insulin receptor to CAP and c-Cbl in the phosphatidylinositol 3-kinase-independent pathway of insulin-stimulated glucose transport. Yeast two-hybrid screening of a 3T3-L1 adipocyte library using APS as a bait identified a 418-amino acid ankyrin and SOCS (suppressor of cytokine signaling) box protein Asb6 as an interactor. Asb6 is an orphan member of a larger family of Asb proteins that are ubiquitously expressed. However, Asb6 expression appears to be restricted to adipose tissue. Asb6 was specifically expressed in 3T3-L1 adipocytes as a 50-kDa protein but not in fibroblasts. In Chinese hamster ovary-insulin receptor (CHO-IR) cells Myc epitope-tagged APS interacted constitutively with FLAG-tagged Asb6 in the presence or absence of insulin stimulation and insulin stimulation did not alter the interaction. In 3T3-L1 adipocytes, insulin receptor activation was accompanied by the APS-dependent recruitment of Asb6. Asb6 did not appear to undergo tyrosine phosphorylation. Immunofluorescence and confocal microscopy studies revealed that Asb6 colocalized with APS in CHO cells and in 3T3-L1 adipocytes. In immunoprecipitation studies in CHO cells or 3T3-L1 adipocytes, the Elongin BC complex was found to be bound to Asb6, and activation of the insulin receptor was required to facilitate Asb6 recruitment along with Elongins B/C. Prolonged insulin stimulation resulted in the degradation of APS when Asb6 was co-expressed but not in the absence of Asb6. We conclude that Asb6 functions to regulate components of the insulin signaling pathway in adipocytes by facilitating degradation by the APS-dependent recruitment of Asb6 and Elongins BC." @default.
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- W2007602308 date "2004-09-01" @default.
- W2007602308 modified "2023-09-27" @default.
- W2007602308 title "Asb6, an Adipocyte-specific Ankyrin and SOCS Box Protein, Interacts with APS to Enable Recruitment of Elongins B and C to the Insulin Receptor Signaling Complex" @default.
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- W2007602308 doi "https://doi.org/10.1074/jbc.m406101200" @default.
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