Structural insights into the activity of enhancer-binding proteins.
Structural insights into the activity of enhancer-binding proteins.
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DOI:
10.1126/science.1105932
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发表时间:
2005-03-25
期刊:
影响因子:
--
通讯作者:
Zhang X
中科院分区:
文献类型:
--
作者:
Rappas M;Schumacher J;Beuron F;Niwa H;Bordes P;Wigneshweraraj S;Keetch CA;Robinson CV;Buck M;Zhang X
Activators of bacterial σ54-RNA polymerase holoenzyme are mechanochemical proteins that use ATP hydrolysis to activate transcription. We have determined a 20 Å resolution structure of an activator, PspF(1-275), bound to an ATP transition state analog (ADP.AlFx), in complex with its basal factor σ54 by cryo-electron microscopy. By fitting the crystal structure of apo PspF(1-275) at 1.75 Å into the EM map we identify two loops involved in binding σ54. By comparing enhancer-binding structures in different nucleotide states and mutational analysis, we propose nucleotide dependent conformational changes that free the loops for association with σ54.
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