3ucz | pdb_00003ucz

The c-di-GMP-I riboswitch bound to GpG

spinqualitylabelsall models 3ucz, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ucz is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG NonStd Res: GTP Related: 3ucu, 3ud3, 3ud4 Gene: SNRPA (Homo sapiens) Resources: FirstGlance, OCA, RCSB, PDBsum Function [SNRPA_HUMAN] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro. Publication Abstract from PubMed The cyclic dinucleotide c-di-GMP regulates lifestyle transitions in many bacteria, such as the change from a free motile state to a biofilm-forming community. Riboswitches that bind this second messenger are important downstream targets in this bacterial signaling pathway. The breakdown of c-di-GMP in the cell is accomplished enzymatically and results in the linear dinucleotide pGpG. The c-di-GMP-binding riboswitches must be able to discriminate between their cognate cyclic ligand and linear dinucleotides in order to be selective biological switches. It has been reported that the c-di-GMP-I riboswitch binds c-di-GMP five orders of magnitude better than the linear pGpG, but the cause of this large energetic difference in binding is unknown. Here we report binding data and crystal structures of several linear c-di-GMP analogs in complex with the c-di-GMP-I riboswitch. These data reveal the parameters for phosphate recognition and the structural basis of linear dinucleotide binding to the riboswitch. Additionally, the pH dependence of binding shows that exclusion of pGpG is not due to the additional negative charge on the ligand. These data reveal principles that, along with published work, will contribute to the design of c-di-GMP analogs with properties desirable for use as chemical tools and potential therapeutics. Structural and biochemical characterization of linear dinucleotide analogs bound to the c-di-GMP-I aptamer.,Smith KD, Lipchock SV, Strobel SA Biochemistry. 2011 Dec 8. PMID:22148472 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nucleoprotein

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