Macromolecule Content

• Total Structure Weight: 28.12 kDa 
• Atom Count: 1890 
• Modelled Residue Count: 142 
• Deposited Residue Count: 142 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

2HGH

Transcription Factor IIIA zinc fingers 4-6 bound to 5S rRNA 55mer (NMR structure)

• DOI: 10.2210/pdb2HGH/pdb
• NDB: 2HGH
• BMRB: 7194

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


• Deposited: 2006-06-27 Released: 2006-08-01 
• Deposition Author(s): Lee, B.M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Induced Fit and 'Lock and Key' Recognition of 5 S RNA by Zinc Fingers of Transcription Factor IIIA

Lee, B.M., Xu, J., Clarkson, B.K., Martinez-Yamout, M.A., Dyson, J.H., Case, D.A., Gottesfeld, J.M., Wright, P.E.

(2006) J Mol Biol 357: 275-291

• PubMed: 16405997 
• DOI: 10.1016/j.jmb.2005.12.010
• Primary Citation of Related Structures:  
  2HGH


• PubMed Abstract: 
  

Transcription factor IIIA (TFIIIA) is a Cys2His2 zinc finger protein that regulates expression of the 5 S ribosomal RNA gene by binding specifically to the internal control element. TFIIIA also functions in transport and storage of 5 S RNA by binding directly to the RNA transcript. To obtain insights into the mechanism by which TFIIIA recognizes 5 S RNA, we determined the solution structure of the middle three zinc fingers bound to the central core of 5 S RNA. Finger 4 utilizes "lock and key" recognition to bind in the widened major groove of the pre-structured RNA loop E motif. This interaction is mediated by direct hydrogen bonding interactions with bases. In contrast, recognition of loop A, a flexible junction of three helices, occurs by an induced fit mechanism that involves reorganization of the conserved CAUA motif and structuring of the finger 5-finger 6 interface to form a complementary RNA binding surface.

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Organizational Affiliation: 

Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcription factor IIIA	B [auth A]	87	Xenopus laevis	Mutation(s): 0  Gene Names: gtf3a
UniProt
Find proteins for P03001 (Xenopus laevis) Explore P03001  Go to UniProtKB:  P03001

Entity ID: 1
Molecule	Chains	Length	Organism	Image
55-MER	A [auth B]	55	N/A

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A], D [auth A], E [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2HGH Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-06-27 
• Released Date: 2006-08-01 
Deposition Author(s): Lee, B.M.

Revision History  

• Version 1.0: 2006-08-01
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance