Structural Study of the Partially Disordered Full-Length delta Subunit of RNA Polymerase from Bacillus subtilis.Papouskova, V., Kaderavek, P., Otrusinova, O., Rabatinova, A., Sanderova, H., Novacek, J., Krasny, L., Sklenar, V., Zidek, L.
(2013) Chembiochem 14: 1772-1779
- PubMed: 23868186
- DOI: 10.1002/cbic.201300226
- PubMed Abstract:
The partially disordered δ subunit of RNA polymerase was studied by various NMR techniques. The structure of the well-folded N-terminal domain was determined based on inter-proton distances in NOESY spectra. The obtained structural model was compared ...
The partially disordered δ subunit of RNA polymerase was studied by various NMR techniques. The structure of the well-folded N-terminal domain was determined based on inter-proton distances in NOESY spectra. The obtained structural model was compared to the previously determined structure of a truncated construct (lacking the C-terminal domain). Only marginal differences were identified, thus indicating that the first structural model was not significantly compromised by the absence of the C-terminal domain. Various (15) N relaxation experiments were employed to describe the flexibility of both domains. The relaxation data revealed that the C-terminal domain is more flexible, but its flexibility is not uniform. By using paramagnetic labels, transient contacts of the C-terminal tail with the N-terminal domain and with itself were identified. A propensity of the C-terminal domain to form β-type structures was obtained by chemical shift analysis. Comparison with the paramagnetic relaxation enhancement indicated a well-balanced interplay of repulsive and attractive electrostatic interactions governing the conformational behavior of the C-terminal domain. The results showed that the δ subunit consists of a well-ordered N-terminal domain and a flexible C-terminal domain that exhibits a complex hierarchy of partial ordering.
Faculty of Science, NCBR and CEITEC MU, Masaryk University, Kamenice 5, 625 00 Brno (Czech Republic).