1l1c

Structure of the LicT Bacterial Antiterminator Protein in Complex with its RNA Target

spinqualitylabelsall models 1l1c Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1l1c is a 3 chain structure with sequence from Bacillus subtilis. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LICT_BACSU Mediates positive regulation of the glucanase operon (licST) by functioning as an antiterminator factor of transcription. Prevents termination at terminator lic-t. 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 LicT is a bacterial regulatory protein able to prevent the premature arrest of transcription. When activated, LicT binds to a 29 base RNA hairpin overlapping a terminator located in the 5' mRNA leader region of the target genes. We have determined the solution structure of the LicT RNA-binding domain (CAT) in complex with its ribonucleic antiterminator (RAT) target by NMR spectroscopy (PDB 1L1C). CAT is a beta-stranded homodimer that undergoes no important conformational changes upon complex formation. It interacts, through mostly hydrophobic and stacking interactions, with the distorted minor groove of the hairpin stem that is interrupted by two asymmetric internal loops. Although different in sequence, these loops share sufficient structural analogy to be recognized similarly by symmetry-related elements of the protein dimer, leading to a quasi- symmetric structure reminiscent of that observed with dimeric transcription regulators bound to palindromic DNA. Sequence analysis suggests that this RNA- binding mode, where the RAT strands are clamped by the CAT dimer, is conserved in homologous systems. Solution structure of the LicT-RNA antitermination complex: CAT clamping RAT.,Yang Y, Declerck N, Manival X, Aymerich S, Kochoyan M EMBO J. 2002 Apr 15;21(8):1987-97. PMID:11953318 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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