2kse

Backbone structure of the membrane domain of E. coli histidine kinase receptor QseC, Center for Structures of Membrane Proteins (CSMP) target 4311C

spinqualitylabelsall models 2kse, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2kse is a 1 chain structure with sequence from Escherichia coli k-12. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: b3026, JW2994, qseC, ygiY (Escherichia coli K-12) Activity: Histidine kinase, with EC number 2.7.13.3 Resources: FirstGlance, OCA, RCSB, PDBsum Function [QSEC_ECOLI] Member of a two-component regulatory system QseB/QseC. Activates the flagella regulon by activating transcription of FlhDC. May activate QseB by phosphorylation. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed NMR structural studies of membrane proteins (MP) are hampered by complications in MP expression, technical difficulties associated with the slow process of NMR spectral peak assignment, and limited distance information obtainable for transmembrane (TM) helices. To overcome the inherent challenges in the determination of MP structures, we have developed a rapid and cost-efficient strategy that combines cell-free (CF) protein synthesis, optimized combinatorial dual-isotope labeling for nearly instant resonance assignment, and fast acquisition of long-distance information using paramagnetic probes. Here we report three backbone structures for the TM domains of the three classes of Escherichia coli histidine kinase receptors (HKRs). The ArcB and QseC TM domains are both two-helical motifs, whereas the KdpD TM domain comprises a four-helical bundle with shorter second and third helices. The interhelical distances (up to 12 A) reveal weak interactions within the TM domains of all three receptors. Determined consecutively within 8 months, these structures offer insight into the abundant and underrepresented in the Protein Data Bank class of 2-4 TM crossers and demonstrate the efficiency of our CF combinatorial dual-labeling strategy, which can be applied to solve MP structures in high numbers and at a high speed. Our results greatly expand the current knowledge of HKR structure, opening the doors to studies on their widespread and pharmaceutically important bacterial signaling mechanism. Membrane domain structures of three classes of histidine kinase receptors by cell-free expression and rapid NMR analysis.,Maslennikov I, Klammt C, Hwang E, Kefala G, Okamura M, Esquivies L, Mors K, Glaubitz C, Kwiatkowski W, Jeon YH, Choe S Proc Natl Acad Sci U S A. 2010 Jun 15;107(24):10902-7. Epub 2010 May 24. PMID:20498088 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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