Journal: Herz
Article Title: Methamphetamine-induced cardiotoxicity: in search of protective transcriptional mechanisms
doi: 10.1007/s00059-024-05279-6
Figure Lengend Snippet: a Crystal structure of a parallel signal transducer and activator of transcription 3 ( STAT3 ) dimer bound to DNA in orthogonal views. The surface structure is colored according to atom type, with oxygen in red, nitrogen in blue, sulfur in dark yellow, and carbon in either bright yellow or green depending on the protomer. The double-helix structure of DNA is colored in cyan. The crystallographic data were taken from the Protein Data Bank (PDB) file 1BG1 for the STAT3 parallel dimer . b Ribbon diagram of an anti-parallel STAT3 dimer. The α‑helical coiled-coil domains are colored in yellow, the DNA-binding domains in cyan, the linker domains in green , and the SH2 domains in red. Structural data were from the PDB file 6TLC for STAT3 . Figures b and c were created with the program PyMOL (DeLano Scientific). c Schematic model of the interleukin (IL)-6-induced JAK/STAT3 signaling pathway. Binding of IL‑6 or a related cytokine to the heterodimeric cell surface receptor triggers a series of tyrosine-phosphorylation steps catalyzed by non-covalently bound Janus kinase ( JAK ), including JAK auto-phosphorylation and receptor phosphorylation. The phosphorylated receptor tail recruits STAT3 molecules, which are then phosphorylated at a single tyrosine ( 1 ). Through spontaneous dissociation and re-association, the activated STAT3 proteins constantly oscillate between a parallel and an antiparallel dimer conformation ( 2 ). After binding to importins ( 3 ), phospho-STAT3 dimers are imported into the nucleus via nuclear pore complexes ( 4 ). In the nucleus, STAT3 proteins modulate gene expression ( 5 ) and rearrange in an antiparallel dimer conformation ( 6 ) to be dephosphorylated ( 7 )
Article Snippet: Figures b and c were created with the program PyMOL (DeLano Scientific). c Schematic model of the interleukin (IL)-6-induced JAK/STAT3 signaling pathway.
Techniques: Binding Assay, Cell Surface Receptor Assay, Phospho-proteomics, Gene Expression
