1bja

ACTIVATION DOMAIN OF THE PHAGE T4 TRANSCRIPTION FACTOR MOTA

spinqualitylabelsall models 1bja, resolution 2.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bja is a 2 chain structure with sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Gene: MOTA (Enterobacteria phage T4) Resources: FirstGlance, OCA, RCSB, PDBsum Function [MOTA_BPT4] Required for the transcriptional activation of middle promoters. Middle promoters are characterized by the presence of the conserved sequence [AT]3TGCTTNA (MotA box). MotA binds directly to MotA boxes. Publication Abstract from PubMed Bacteriophage T4 encodes a transcription factor, MotA, that binds to the -30 region of middle-mode promoters and activates transcription by host RNA polymerase. We have solved the structure of the MotA activation domain to 2.2 A by X-ray crystallography, and have also determined its secondary structure by NMR. An area on the surface of the protein has a distinctive patch that is populated with acidic and hydrophobic residues. Mutations within this patch cause a defective T4 growth phenotype, arguing that the patch is important for MotA function. One of the mutant MotA activation domains was purified and analyzed by NMR, and the spectra clearly show that the domain is properly folded. The mutant full-length protein appears to bind DNA normally but is deficient in transcriptional activation. We conclude that the acidic/hydrophobic surface patch is specifically involved in transcriptional activation, which is reminiscent of eukaryotic acidic activation domains. The activation domain of the MotA transcription factor from bacteriophage T4.,Finnin MS, Cicero MP, Davies C, Porter SJ, White SW, Kreuzer KN EMBO J. 1997 Apr 15;16(8):1992-2003. PMID:9155025 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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