Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 25.18 kDa 
• Atom Count: 1978 
• Modelled Residue Count: 195 
• Deposited Residue Count: 215 
• Unique protein chains: 1

4BJI

Sfc1-DBD

• DOI: 10.2210/pdb4BJI/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Schizosaccharomyces pombe 927
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2013-04-18 Released: 2013-07-31 
• Deposition Author(s): Taylor, N.M.I., Baudin, F., von Scheven, G., Muller, C.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.170 
• R-Value Work: 0.151 
• R-Value Observed: 0.152 

Literature

RNA Polymerase III-Specific General Transcription Factor Iiic Contains a Heterodimer Resembling Tfiif RAP30/RAP74.

Taylor, N.M.I., Baudin, F., Von Scheven, G., Muller, C.W.

(2013) Nucleic Acids Res 41: 9183

• PubMed: 23921640 
• DOI: 10.1093/nar/gkt664
• Primary Citation of Related Structures:  
  4BJI, 4BJJ


• PubMed Abstract: 
  

Transcription of tRNA-encoding genes by RNA polymerase (Pol) III requires the six-subunit general transcription factor IIIC that uses subcomplexes τA and τB to recognize two gene-internal promoter elements named A- and B-box. The Schizosaccharomyces pombe τA subcomplex comprises subunits Sfc1, Sfc4 and Sfc7. The crystal structure of the Sfc1/Sfc7 heterodimer reveals similar domains and overall domain architecture to the Pol II-specific general transcription factor TFIIF Rap30/Rap74. The N-terminal Sfc1/Sfc7 dimerization module consists of a triple β-barrel similar to the N-terminal TFIIF Rap30/Rap74 dimerization module, whereas the C-terminal Sfc1 DNA-binding domain contains a winged-helix domain most similar to the TFIIF Rap30 C-terminal winged-helix domain. Sfc1 DNA-binding domain recognizes single and double-stranded DNA by an unknown mechanism. Several features observed for A-box recognition by τA resemble the recognition of promoters by bacterial RNA polymerase, where σ factor unfolds double-stranded DNA and stabilizes the non-coding DNA strand in an open conformation. Such a function has also been proposed for TFIIF, suggesting that the observed structural similarity between Sfc1/Sfc7 and TFIIF Rap30/Rap74 might also reflect similar functions.

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Organizational Affiliation: 

European Molecular Biology Laboratory (EMBL), Structural and Computational Biology Unit, Meyerhofstrasse 1, 69117 Heidelberg, Germany and UJF-EMBL-CNRS UMI 3265, Unit of Virus Host-Cell Interactions, 38042 Grenoble Cedex 9, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTION FACTOR TAU SUBUNIT SFC1	A	215	Schizosaccharomyces pombe 927	Mutation(s): 0
UniProt
Find proteins for O14229 (Schizosaccharomyces pombe (strain 972 / ATCC 24843)) Explore O14229  Go to UniProtKB:  O14229

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 0.170 
• R-Value Work: 0.151 
• R-Value Observed: 0.152 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 35.38	α = 90
b = 67.64	β = 90
c = 88.06	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
SHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-04-18 
• Released Date: 2013-07-31 
Deposition Author(s): Taylor, N.M.I., Baudin, F., von Scheven, G., Muller, C.W.

Revision History  

• Version 1.0: 2013-07-31
  Type: Initial release
  
• Version 1.1: 2013-08-21
  Changes: Database references
• Version 1.2: 2013-11-06
  Changes: Database references