5N7Y | pdb_00005n7y

Solution structure of B. subtilis Sigma G inhibitor CsfB

• PDB DOI: https://doi.org/10.2210/pdb5N7Y/pdb
• BMRB: 34102

• Classification: TRANSCRIPTION
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2017-02-21 Released: 2018-02-28 
• Deposition Author(s): Martinez-Lumbreras, S., Alfano, C., Atkinson, A., Isaacson, R.L.

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Experimental Data Snapshot

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

Literature

Structural and Functional Insights into Bacillus subtilis Sigma Factor Inhibitor, CsfB.

Martinez-Lumbreras, S., Alfano, C., Evans, N.J., Collins, K.M., Flanagan, K.A., Atkinson, R.A., Krysztofinska, E.M., Vydyanath, A., Jackter, J., Fixon-Owoo, S., Camp, A.H., Isaacson, R.L.

(2018) Structure 26: 640-648.e5

• PubMed: 29526435 
• DOI: https://doi.org/10.1016/j.str.2018.02.007
• Primary Citation Related Structures: 
  5N7Y


• PubMed Abstract: 
  

  Global changes in bacterial gene expression can be orchestrated by the coordinated activation/deactivation of alternative sigma (σ) factor subunits of RNA polymerase. Sigma factors themselves are regulated in myriad ways, including via anti-sigma factors. Here, we have determined the solution structure of anti-sigma factor CsfB, responsible for inhibition of two alternative sigma factors, σ ^G and σ ^E , during spore formation by Bacillus subtilis. CsfB assembles into a symmetrical homodimer, with each monomer bound to a single Zn ²⁺ ion via a treble-clef zinc finger fold. Directed mutagenesis indicates that dimer formation is critical for CsfB-mediated inhibition of both σ ^G and σ ^E , and we have characterized these interactions in vitro. This work represents an advance in our understanding of how CsfB mediates inhibition of two alternative sigma factors to drive developmental gene expression in a bacterium.

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Organizational Affiliation: 
• Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK.
Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK; Structural Biology and Biophysics Unit, Fondazione Ri.MED, Via Bandiera, 11, 90133 Palermo, Italy.
Department of Biological Sciences, Mount Holyoke College, 50 College Street, South Hadley, MA 01075, USA.
Centre for Biomolecular Spectroscopy and Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK.
Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK. Electronic address: [e-mail].

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content 

• Total Structure Weight: 11.39 kDa 
• Atom Count: 782 
• Modeled Residue Count: 98 
• Deposited Residue Count: 98 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anti-sigma-G factor Gin	A, B [auth C]	49	Bacillus subtilis	Mutation(s): 0  Gene Names: csfB, gin, yaaM, BSU00240
UniProt
Find proteins for P37534 (Bacillus subtilis (strain 168)) Explore P37534  Go to UniProtKB:  P37534

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A], D [auth C]	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 

Structure Validation

Currently 5N7Y does not have a validation slider image.

Entry History 

& Funding Information

Deposition Data

• Released Date: 2018-02-28 
Deposition Author(s): Martinez-Lumbreras, S., Alfano, C., Atkinson, A., Isaacson, R.L.

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Funding Organization	Location	Grant Number
	United Kingdom	--

Revision History  

• Version 1.0: 2018-02-28
  Type: Initial release
  
• Version 2.0: 2018-03-21
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Experimental preparation
• Version 2.1: 2018-04-11
  Changes: Data collection, Database references
• Version 2.2: 2019-05-08
  Changes: Data collection
• Version 2.3: 2024-06-19
  Changes: Data collection, Database references, Derived calculations