Macromolecule Content

• Total Structure Weight: 7.18 kDa 
• Atom Count: 469 
• Modelled Residue Count: 59 
• Deposited Residue Count: 64 
• Unique protein chains: 1

2WNM

Solution structure of Gp2

• DOI: 10.2210/pdb2WNM/pdb

• Classification: HYDROLASE
• Organism(s): Escherichia phage T7
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-07-13 Released: 2010-02-16 
• Deposition Author(s): Camara, B., Liu, M., Shadrinc, A., Liu, B., Simpson, P., Weinzierl, R., Severinovc, K., Cota, E., Matthews, S., Wigneshweraraj, S.R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 1 
• Selection Criteria: REPRESENTATIVE STRUCTURE 

Literature

T7 Phage Protein Gp2 Inhibits the Escherichia Coli RNA Polymerase by Antagonizing Stable DNA Strand Separation Near the Transcription Start Site.

Camara, B., Liu, M., Reynolds, J., Shadrin, A., Liu, B., Kwok, K., Simpson, P., Weinzierl, R., Severinov, K., Cota, E., Matthews, S., Wigneshweraraj, S.R.

(2010) Proc Natl Acad Sci U S A 107: 2247

• PubMed: 20133868 
• DOI: 10.1073/pnas.0907908107
• Primary Citation of Related Structures:  
  2WNM


• PubMed Abstract: 
  

Infection of Escherichia coli by the T7 phage leads to rapid and selective inhibition of the host RNA polymerase (RNAP)--a multi-subunit enzyme responsible for gene transcription--by a small ( approximately 7 kDa) phage-encoded protein called Gp2. Gp2 is also a potent inhibitor of E. coli RNAP in vitro. Here we describe the first atomic resolution structure of Gp2, which reveals a distinct run of surface-exposed negatively charged amino acid residues on one side of the molecule. Our comprehensive mutagenesis data reveal that two conserved arginine residues located on the opposite side of Gp2 are important for binding to and inhibition of RNAP. Based on a structural model of the Gp2-RNAP complex, we propose that inhibition of transcription by Gp2 involves prevention of RNAP-promoter DNA interactions required for stable DNA strand separation and maintenance of the "transcription bubble" near the transcription start site, an obligatory step in the formation of a transcriptionally competent promoter complex.

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Organizational Affiliation: 

Department of Microbiology and Centre for Molecular Microbiology and Infection, Imperial College London, London SW7 2AZ, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GENE 2	A	64	Escherichia phage T7	Mutation(s): 0  Gene Names: 2
Find proteins for P03704 (Escherichia phage T7) Explore P03704  Go to UniProtKB:  P03704

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 1 
• Selection Criteria: REPRESENTATIVE STRUCTURE 
• OLDERADO: 2WNM Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-07-13 
• Released Date: 2010-02-16 
Deposition Author(s): Camara, B., Liu, M., Shadrinc, A., Liu, B., Simpson, P., Weinzierl, R., Severinovc, K., Cota, E., Matthews, S., Wigneshweraraj, S.R.

Revision History  

• Version 1.0: 2010-02-16
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance