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The production of retinol binding protein 4 (RBP4) is higher in adipose tissue in type 2 diabetes. We have found that proteasome subunit beta type 1 (PSMB1) is a transcriptional activator of Rbp4. In the present study, the putative tyrosine phosphorylation site in PSMB1 was mutated to phenylalanine. The mutated form of PSMB1 displayed increased nuclear translocation, resulting in activation of transcription in adipocytes.
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Yamauchi et al. (2013) studied this question.
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