6p0s

Crystal structure of ternary DNA complex "FX2" containing E. coli Fis and phage lambda Xis

spinqualitylabelsall models 6p0s, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6p0s is a 5 chain structure with sequence from Escherichia coli, Escherichia coli K-12 and Escherichia virus Lambda. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.7Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FIS_ECOLI Activates ribosomal RNA transcription, as well other genes. Plays a direct role in upstream activation of rRNA promoters. Binds to a recombinational enhancer sequence that is required to stimulate hin-mediated DNA inversion. Prevents initiation of DNA replication from oriC. Publication Abstract from PubMed Localized arrays of proteins cooperatively assemble onto chromosomes to control DNA activity in many contexts. Binding cooperativity is often mediated by specific protein-protein interactions, but cooperativity through DNA structure is becoming increasingly recognized as an additional mechanism. During the site-specific DNA recombination reaction that excises phage lambda from the chromosome, the bacterial DNA architectural protein Fis recruits multiple lambda-encoded Xis proteins to the attR recombination site. Here, we report X-ray crystal structures of DNA complexes containing Fis + Xis, which show little, if any, contacts between the two proteins. Comparisons with structures of DNA complexes containing only Fis or Xis, together with mutant protein and DNA binding studies, support a mechanism for cooperative protein binding solely by DNA allostery. Fis binding both molds the minor groove to potentiate insertion of the Xis beta-hairpin wing motif and bends the DNA to facilitate Xis-DNA contacts within the major groove. The Fis-structured minor groove shape that is optimized for Xis binding requires a precisely positioned pyrimidine-purine base-pair step, whose location has been shown to modulate minor groove widths in Fis-bound complexes to different DNA targets. Cooperative DNA binding by proteins through DNA shape complementarity.,Hancock SP, Cascio D, Johnson RC Nucleic Acids Res. 2019 Sep 19;47(16):8874-8887. doi: 10.1093/nar/gkz642. PMID:31616952 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also FIS protein

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