1BH9

HTAFII18/HTAFII28 HETERODIMER CRYSTAL STRUCTURE WITH BOUND PCMBS

• PDB DOI:  https://doi.org/10.2210/pdb1BH9/pdb

• Classification: TRANSCRIPTION REGULATION COMPLEX
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1998-06-16 Released: 1999-06-22 
• Deposition Author(s): Birck, C., Poch, O., Romier, C., Ruff, M., Mengus, G., Lavigne, A.-C., Davidson, I., Moras, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.257 
• R-Value Work: 0.205 
• R-Value Observed: 0.205 

Literature

Human TAF(II)28 and TAF(II)18 interact through a histone fold encoded by atypical evolutionary conserved motifs also found in the SPT3 family.

Birck, C., Poch, O., Romier, C., Ruff, M., Mengus, G., Lavigne, A.C., Davidson, I., Moras, D.

(1998) Cell 94: 239-249

• PubMed: 9695952 
• DOI: https://doi.org/10.1016/s0092-8674(00)81423-3
• Primary Citation of Related Structures:  
  1BH8, 1BH9


• PubMed Abstract: 
  

Determination of the crystal structure of the human TBP-associated factor (hTAF(II))28/hTAF(II)18 heterodimer shows that these TAF(II)s form a novel histone-like pair in the TFIID complex. The histone folds in hTAF(II)28 and hTAF(II)18 were not predicted from their primary sequence, indicating that these TAF(II)s define a novel family of atypical histone fold sequences. The TAF(II)18 and TAF(II)28 histone fold motifs are also present in the N- and C-terminal regions of the SPT3 proteins, suggesting that the histone fold in SPT3 may be reconstituted by intramolecular rather than classical intermolecular interactions. The existence of additional histone-like pairs in both the TFIID and SAGA complexes shows that the histone fold is a more commonly used motif for mediating TAF-TAF interactions than previously believed.

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Organizational Affiliation: 

Institut de Génétique et de Biologie, Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, C.U. de Strasbourg, France.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 15.75 kDa 
• Atom Count: 1,149 
• Modelled Residue Count: 134 
• Deposited Residue Count: 134 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TAFII18	A	45	Homo sapiens	Mutation(s): 0  Gene Names: TAF13, TAF2K, TAFII18
UniProt & NIH Common Fund Data Resources
Find proteins for Q15543 (Homo sapiens) Explore Q15543  Go to UniProtKB:  Q15543
PHAROS:  Q15543

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TAFII28	B	89	Homo sapiens	Mutation(s): 0  Gene Names: TAF11, TAF2I, PRO2134
UniProt & NIH Common Fund Data Resources
Find proteins for Q15544 (Homo sapiens) Explore Q15544  Go to UniProtKB:  Q15544
PHAROS:  Q15544

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PMB	C [auth B]	PARA-MERCURY-BENZENESULFONIC ACID C6 H5 Hg O3 S KQAOIKIZSJJTII-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.257 
• R-Value Work: 0.205 
• R-Value Observed: 0.205 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.8	α = 90
b = 48.4	β = 90
c = 70.1	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-06-22 
Deposition Author(s): Birck, C., Poch, O., Romier, C., Ruff, M., Mengus, G., Lavigne, A.-C., Davidson, I., Moras, D.

Revision History  

• Version 1.0: 1999-06-22
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-04
  Changes: Data collection
• Version 1.4: 2018-04-11
  Changes: Data collection