IndraLab
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"IRS1 phosphorylation at S1101 by S6K1 could play an important role in metabolic stress mechanisms and contribute to the development of IR; this phosphorylation has been cataloged as an early event in the desensitization of insulin signaling in pathological contexts [ xref , xref ]."
"Nevertheless, s6k1-deficient mice remain sensitive to insulin owing to the apparent loss of a negative feedback loop from s6k1 to insulin receptor substrate 1 (irs1), which blunts s307 and s636/s639 phosphorylation; thus under conditions of nutrient satiation s6k1 negatively regulates insulin."