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. 2021 Jan 15;12:383. doi: 10.1038/s41467-020-20669-0

Fig. 4. The TAp63β isoform is a transcriptionally active tetramer.

Fig. 4

a TAp63 and ΔNp63 isoforms domains: TA transactivation domain, DBD DNA-binding domain, OD oligomerization domain, SAM sterile alpha motif, TID transactivation inhibitory domain. The C-terminus of p63β and p63γ diverge from p63α starting from residue 411 or 512, respectively. b The relative luciferase activity expressed as the fold over control (Ctr) of TAp63 isoforms shows that specific C-terminus amino acids do not reduce transcriptional activity except the TID in case of the α-isoform. TAp63 (..572) misses the post-SAM part of the protein; TAp63 (…411) reflect the common part of TAp63β; and TAp63γ with TAp63α. n = 3 biologically independent experiments, luciferase assay was performed in triplicates on PUMA 4xBS2WT responsive elements (REs). Data are presented as mean ± SD, p-value by two-tailed unpaired Student’s t-test. WB analysis of TAp63 isoforms and deletion variants in luciferase assay extracts are shown below the graph. GAPDH was used as loading control; c Oligomeric state analysis of the indicated p63 isoforms via BN-PAGE expressed in vitro in rabbit reticulocyte lysate. The oligomeric conformation is indicated by T (tetramer), D (dimer), M (monomer); d The relative luciferase activity expressed as fold over control (Ctr) shows the ability of TAp63α and β to transactivate the PUMA and NOXA promoters. n = 3 biologically independent experiments, luciferase assay was performed in triplicates. Data are presented as mean ± SD, p-value by two-tailed unpaired Student’s t-test; e The relative luciferase activity expressed as the fold over control (Ctr) shows the ability of ΔNp63α and ΔNp63β to transactivate the Envoplakin (ENV) and Bullous pemphigoid antigen 1 (BPAG1) promoters. n = 3 biologically independent experiments, luciferase assay was performed in triplicates. Data are presented as mean ± SD, p-value by two-tailed unpaired Student’s t-test. Source data are provided as a Source Data file.