XBP1(redirected from Tax-responsive element-binding protein 5)
XBP1A gene on chromosome 22q12.1 that encodes a bZIP protein transcription factor, which regulates MHC class-II genes by binding to a promoter element or X box.
XBP1 binds to a T-cell leukaemia virus type-1 promoter, and may increase expression of viral proteins by acting as the DNA binding partner of a viral transactivator.
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