Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.55 kDa 
• Atom Count: 1,469 
• Modelled Residue Count: 139 
• Deposited Residue Count: 139 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

 1L1C

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

• PDB DOI: 10.2210/pdb1L1C/pdb
• NDB: 1L1C

• Classification: TRANSCRIPTION/RNA
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-02-15 Released: 2002-03-27 
• Deposition Author(s): Yang, Y., Declerck, N., Manival, X., Aymerich, S., Kochoyan, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 6TWR

Literature

Solution structure of the LicT-RNA antitermination complex: CAT clamping RAT.

Yang, Y., Declerck, N., Manival, X., Aymerich, S., Kochoyan, M.

(2002) EMBO J 21: 1987-1997

• PubMed: 11953318 
• DOI: 10.1093/emboj/21.8.1987
• Primary Citation of Related Structures:  
  1L1C


• PubMed Abstract: 
  

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.

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Organizational Affiliation: 

Centre de Biochimie Structurale, CNRS-UMR 9955, INSERM-U554, Université de Montpellier I, 29 rue de Navacelles, F-34090 Montpellier, France.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcription antiterminator licT	B [auth A], C [auth B]	55	Bacillus subtilis	Mutation(s): 0  Gene Names: licT
UniProt
Find proteins for P39805 (Bacillus subtilis (strain 168)) Explore P39805  Go to UniProtKB:  P39805

Entity ID: 1
Molecule	Chains	Length	Organism	Image
licT mRNA antiterminator hairpin	A [auth C]	29	N/A

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-03-27 
Deposition Author(s): Yang, Y., Declerck, N., Manival, X., Aymerich, S., Kochoyan, M.

Revision History  

• Version 1.0: 2002-03-27
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Data collection, Database references, Derived calculations