regulation of cellular response to stress / DNA-binding transcription activator activity / phosphorelay signal transduction system / cis-regulatory region sequence-specific DNA binding / protein-DNA complex / transcription regulator complex / sequence-specific DNA binding / negative regulation of DNA-templated transcription / regulation of DNA-templated transcription / positive regulation of DNA-templated transcription ...regulation of cellular response to stress / DNA-binding transcription activator activity / phosphorelay signal transduction system / cis-regulatory region sequence-specific DNA binding / protein-DNA complex / transcription regulator complex / sequence-specific DNA binding / negative regulation of DNA-templated transcription / regulation of DNA-templated transcription / positive regulation of DNA-templated transcription / ATP hydrolysis activity / DNA binding / ATP binding / identical protein binding / cytoplasm 類似検索 - 分子機能
ジャーナル: Science / 年: 2005 タイトル: Structural insights into the activity of enhancer-binding proteins. 著者: Mathieu Rappas / Jorg Schumacher / Fabienne Beuron / Hajime Niwa / Patricia Bordes / Sivaramesh Wigneshweraraj / Catherine A Keetch / Carol V Robinson / Martin Buck / Xiaodong Zhang / 要旨: Activators of bacterial sigma54-RNA polymerase holoenzyme are mechanochemical proteins that use adenosine triphosphate (ATP) hydrolysis to activate transcription. We have determined by cryogenic ...Activators of bacterial sigma54-RNA polymerase holoenzyme are mechanochemical proteins that use adenosine triphosphate (ATP) hydrolysis to activate transcription. We have determined by cryogenic electron microscopy (cryo-EM) a 20 angstrom resolution structure of an activator, phage shock protein F [PspF(1-275)], which is bound to an ATP transition state analog in complex with its basal factor, sigma54. By fitting the crystal structure of PspF(1-275) at 1.75 angstroms into the EM map, we identified two loops involved in binding sigma54. Comparing enhancer-binding structures in different nucleotide states and mutational analysis led us to propose nucleotide-dependent conformational changes that free the loops for association with sigma54.
解像度: 1.75→100 Å / Data cutoff high absF: 10000000 / Isotropic thermal model: RESTRAINED / 交差検証法: THROUGHOUT / σ(F): 2 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. DISORDERED REGIONS WERE MODELED AS ALANINES.