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71.
Michael Riis Hansen Richard Harris Eric W. Barr Hong Cheng Mark E. Girvin Charles Grubmeyer 《Biomolecular NMR assignments》2014,8(1):103-108
The type I phosphoribosyltransferase OMP synthase (EC 2.4.2.10) is involved in de novo synthesis of pyrimidine nucleotides forming the UMP precursor orotidine 5′-monophosphate (OMP). The homodimeric enzyme has a Rossman α/β core topped by a base-enclosing “hood” domain and a flexible domain-swapped catalytic loop. High-resolution X-ray structures of the homologous Salmonella typhimurium and yeast enzymes show that a general compacting of the core as well as movement of the hood and a major disorder-to-order transition of the loop occur upon binding of ligands MgPRPP and orotate. Here we present backbone NMR assignments for the unliganded yeast enzyme (49 kDa) and its complex with product OMP. We were able to assign 212–213 of the 225 non-proline backbone 15N and amide proton resonances. Significant difference in chemical shifts of the amide cross peaks occur in regions of the structure that undergo movement upon ligand occupancy in the S. typhimurium enzyme. 相似文献
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Sébastien F. Poget Richard Harris Sean M. Cahill Mark E. Girvin 《Biomolecular NMR assignments》2010,4(2):139-142
The plasmid-encoded small multidrug resistance pump from S. aureus transports a variety of quaternary ammonium and other hydrophobic compounds, enhancing the bacterial host’s resistance to common hospital disinfectants. The protein folds as a homo-dimer of four transmembrane helices each, and appears to be fully functional only in lipid bilayers. Here we report the backbone resonance assignments and implied secondary structure for 2H13C15N Smr reconstituted into lipid bicelles. Significant changes were observed between the chemical shifts of the protein in lipid bicelles compared to those in detergent micelles. 相似文献