Publication details
Backbone dynamics of N-terminal Domain of the Delta Subunit of Bacterial RNA Polymerase
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| Year of publication | 2009 |
| Type | Conference abstract |
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| Description | The RNA polymerase consists of eight subunits. A dimer of two alpha subunits holds together two beta subunits which form the active site. The sigma subunit is responsible for both promoter recognition and ranscription initiation [1], whereas the roles of the two omega subunits are poorly understood. The delta subunit increases both the transcriptional specificity [2],[3],[4],[5],[6],[7] and the efficiency of RNA synthesis [5],[6],[7]. The delta subunit and one of the omega subunits are not conserved throughout all bacterial species. Here we present the backbone dynamics of the N-terminal domain of the delta subunit of bacterial RNA polymerase from Bacillus subtilis. The N-terminal domain of the delta subunit has a well-defined structure, while the C-terminal domain is unstructured and highly negatively charged. Here we focus on the isolated N-terminal domain, whose structure consists of an alpha helical core and a short beta sheet [8]. The standard set of 15-N relaxation experiments (R1,R2,NOE) were performed at two magnetic field (500MHz, 600MHz) in order to analyze fast ns-ps backbone motions. The relaxation experiments were acquired at two temperatures (300K, 280K) in order to get a more comprehensive description. Slow motions on the ms-us timescale were investigated by CPMG and T1rho relaxation dispersion experiments. An interesting dynamic behavior was revealed in the region involving the short beta sheet and its proximity. REFERENCES: [1] Cramer P., Current Opinion in Structural Biology, 12, 89-97, 2002 [2] Achberger E.C., Whiteley H.R., Journal of Biological Chemistry, 256, 7424-7432, 1981 [3] Achberger E.C., Tahara M., Whiteley H.R., Journal of Bacteriology, 150, 977-980, 1982 [4] Dobinson K.F., Spiegelman G.B., Biochemistry, 26, 8206-8213, 1987 [5] Juang Y.L., Helmann J.D., Journal of Molecular Biology, 239, 1-14, 1994 [6] Juang Y.L., Helmann J.D., Biochemistry, 34, 14270-14270, 1995 [7] Juang Y.L., Helmann J.D., Biochemistry, 34, 8465-8473, 1995 [8] Motáčková V., Šanderová H., Nováček J., Žídek L.,Sklenář V., Krasný L., (poster), 7th Discussions in Structural Molecular Biology, Nové Hrady, 2009 |