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leucine zipper domain found in TSC22 domain family protein 4 TSC22 domain family protein 4 (TSC22D4), also called TSC22-related-inducible leucine zipper protein 2 (TILZ2), or Tsc-22-like protein THG-1, is a transcriptional repressor that acts as a molecular determinant of insulin signalling and glucose handling. It also functions in hepatic lipid handling by regulating hepatic very-low-density-lipoprotein (VLDL) release and lipogenic gene expression. This model corresponds to the conserved leucine zipper (ZIP) domain located at the C-terminus of TSC22D4. Its first helix is not basic and does not contain the consensus sequence, NXX(A)(A)XX(C/S)R, found in most basic region/leucine zipper (bZIP) proteins. Thus, the DNA-binding capability of the ZIP domain is not obvious. Similar to bZIP, ZIP forms homo- and heterodimers, resulting in many dimers that may have different effects on transcription. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",