Macromolecule Content

• Total Structure Weight: 18.47 kDa 
• Atom Count: 1294 
• Residue Count: 158 
• Unique protein chains: 2

2PHE

Model for VP16 binding to PC4

• DOI: 10.2210/pdb2PHE/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens, Human alphaherpesvirus 1 strain 17
• Expression System: Escherichia coli BL21, Escherichia coli
• Mutation(s): No 


• Deposited: 2007-04-11 Released: 2007-04-24 
• Deposition Author(s): Jonker, H.R.A., Wechselberger, R.W., Boelens, R., Folkers, G.E., Kaptein, R.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 10 
• Selection Criteria: Top-ranked ensemble, according to the average interaction energy and buried surface area 

Literature

Structural Properties of the Promiscuous VP16 Activation Domain

Jonker, H.R.A., Wechselberger, R.W., Boelens, R., Folkers, G.E., Kaptein, R.

(2005) Biochemistry 44: 827-839

• PubMed: 15654739 
• DOI: 10.1021/bi0482912
• Primary Citation of Related Structures:  
  2PHG, 2PHE


• PubMed Abstract: 
  

Herpes simplex virion protein 16 (VP16) contains two strong activation regions that can independently and cooperatively activate transcription in vivo. We have identified the regions and residues involved in the interaction with the human transcriptional coactivator positive cofactor 4 (PC4) and the general transcription factor TFIIB. NMR and biochemical experiments revealed that both VP16 activation regions are required for the interaction and undergo a conformational transition from random coil to alpha-helix upon binding to its target PC4. The interaction is strongly electrostatically driven and the binding to PC4 is enhanced by the presence of its amino-terminal domain. We propose models for binding of VP16 to the core domains of PC4 and TFIIB that are based on two independent docking approaches using NMR chemical shift changes observed in titration experiments. The models are consistent with results from site-directed mutagenesis and provide an explanation for the contribution of both acidic and hydrophobic residues for transcriptional activation by VP16. Both intrinsically unstructured activation domains are attracted to their interaction partner by electrostatic interactions, and adopt an alpha-helical conformation around the important hydrophobic residues. The models showed multiple distinct binding surfaces upon interaction with various partners, providing an explanation for the promiscuous properties, cooperativity, and the high activity of this activation domain.

---

Organizational Affiliation: 

Bijvoet Center for Biomolecular Research, section NMR spectroscopy, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTIONAL COACTIVATOR PC4	A, B	66	Homo sapiens	Mutation(s): 0  Gene Names: SUB1, PC4, RPO2TC1
Find proteins for P53999 (Homo sapiens) Explore P53999  Go to UniProtKB:  P53999
NIH Common Fund Data Resources
PHAROS  P53999 GTEx  ENSG00000113387

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha trans-inducing protein	C	26	Human alphaherpesvirus 1 strain 17	Mutation(s): 0  Gene Names: UL48
Find proteins for P06492 (Human herpesvirus 1 (strain 17)) Explore P06492  Go to UniProtKB:  P06492

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 10 
• Selection Criteria: Top-ranked ensemble, according to the average interaction energy and buried surface area 
• OLDERADO: 2PHE Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-04-11 
• Released Date: 2007-04-24 
Deposition Author(s): Jonker, H.R.A., Wechselberger, R.W., Boelens, R., Folkers, G.E., Kaptein, R.

Revision History 

• Version 1.0: 2007-04-24
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance