4ht8 | pdb_00004ht8

Crystal structure of E coli Hfq bound to poly(A) A7

spinqualitylabelsall models 4ht8, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ht8 is a 8 chain structure with sequence from Escherichia coli bl21(de3). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: B21_04001, ECBD_3862, ECD_04039, hfq (Escherichia coli BL21(DE3)) Resources: FirstGlance, OCA, RCSB, PDBsum Function [C6ECV6_ECOBD] RNA chaperone that binds small regulatory RNA (sRNAs) and mRNAs to facilitate mRNA translational regulation in response to envelope stress, environmental stress and changes in metabolite concentrations. Also binds with high specificity to tRNAs (By similarity).[SAAS:SAAS005001_004_036087][HAMAP-Rule:MF_00436] Publication Abstract from PubMed The rpoS mRNA, which encodes the master regulator sigma(S) of general stress response, requires Hfq-facilitated base pairing with DsrA small RNA for efficient translation at low temperatures. It has recently been proposed that one mechanism underlying Hfq action is to bridge a transient ternary complex by simultaneously binding to rpoS and DsrA. However, no structural evidence of Hfq simultaneously bound to different RNAs has been reported. We detected simultaneous binding of Hfq to rpoS and DsrA fragments. Crystal structures of AU6A*Hfq*A7 and Hfq*A7 complexes were resolved using 1.8- and 1.9-A resolution, respectively. Ternary complex has been further verified in solution by NMR. In vivo, activation of rpoS translation requires intact Hfq, which is capable of bridging rpoS and DsrA simultaneously into ternary complex. This ternary complex possibly corresponds to a meta-stable transition state in Hfq-facilitated small RNA-mRNA annealing process. Hfq-bridged ternary complex is important for translation activation of rpoS by DsrA.,Wang W, Wang L, Wu J, Gong Q, Shi Y Nucleic Acids Res. 2013 Jun 1;41(11):5938-48. doi: 10.1093/nar/gkt276. Epub 2013 , Apr 19. PMID:23605038 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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