1t0x

Theoretical Model: The protein structure described on this page was determined theoretically, and hence should be interpreted with caution.

MODEL OF THE BACTERIAL RNA POLYMERASE OPEN COMPLEX WITH THE SUBSTRATE AND PPGPP BOUND

spinqualitylabelsall models 1t0x Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, PDBsum, ProSAT Publication Abstract from PubMed Guanosine-tetraphosphate (ppGpp) is a major regulator of stringent control, an adaptive response of bacteria to amino acid starvation. The 2.7 A resolution structure of the Thermus thermophilus RNA polymerase (RNAP) holoenzyme in complex with ppGpp reveals that ppGpp binds to the same site near the active center in both independent RNAP molecules in the crystal but in strikingly distinct orientations. Binding is symmetrical with respect to the two diphosphates of ppGpp and is relaxed with respect to the orientation of the nucleotide base. Different modes of ppGpp binding are coupled with asymmetry of the active site configurations. The results suggest that base pairing of ppGpp with cytosines in the nontemplate DNA strand might be an essential component of transcription control by ppGpp. We present experimental evidence highlighting the importance of base-specific contacts between ppGpp and specific cytosine residues during both transcription initiation and elongation. Structural basis for transcription regulation by alarmone ppGpp.,Artsimovitch I, Patlan V, Sekine S, Vassylyeva MN, Hosaka T, Ochi K, Yokoyama S, Vassylyev DG Cell. 2004 Apr 30;117(3):299-310. PMID:15109491 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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