6tbz

Crystal structure of the MH1 domain of Smad5-Smad3 chimera construct bound to the GGCGC site

spinqualitylabelsall models 6tbz, resolution 1.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6tbz is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.782Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SMAD5_CHICK Transcriptional modulator activated by BMP (bone morphogenetic proteins) type 1 receptor kinase. SMAD5 is a receptor-regulated SMAD (R-SMAD) (By similarity). Publication Abstract from PubMed Smad transcription factors are the main downstream effectors of the Transforming growth factor beta superfamily (TGFbeta) signalling network. The DNA complexes determined here by X-ray crystallography for the Bone Morphogenetic Proteins (BMP) activated Smad5 and Smad8 proteins reveal that all MH1 domains bind [GGC(GC)|(CG)] motifs similarly, although TGFbeta-activated Smad2/3 and Smad4 MH1 domains bind as monomers whereas Smad1/5/8 form helix-swapped dimers. Dimers and monomers are also present in solution, as revealed by NMR. To decipher the characteristics that defined these dimers, we designed chimeric MH1 domains and characterized them using X-ray crystallography. We found that swapping the loop1 between TGFbeta- and BMP- activated MH1 domains switches the dimer/monomer propensities. When we scanned the distribution of Smad-bound motifs in ChIP-Seq peaks (Chromatin immunoprecipitation followed by high-throughput sequencing) in Smad-responsive genes, we observed specific site clustering and spacing depending on whether the peaks correspond to BMP- or TGFbeta-responsive genes. We also identified significant correlations between site distribution and monomer or dimer propensities. We propose that the MH1 monomer or dimer propensity of Smads contributes to the distinct motif selection genome-wide and together with the MH2 domain association, help define the composition of R-Smad/Smad4 trimeric complexes. Unveiling the dimer/monomer propensities of Smad MH1-DNA complexes.,Ruiz L, Kaczmarska Z, Gomes T, Aragon E, Torner C, Freier R, Baginski B, Martin-Malpartida P, de Martin Garrido N, Marquez JA, Cordeiro TN, Pluta R, Macias MJ Comput Struct Biotechnol J. 2021 Jan 6;19:632-646. doi: , 10.1016/j.csbj.2020.12.044. eCollection 2021. PMID:33510867 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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