8B3Z | pdb_00008b3z

SigE N-terminal Domain

• PDB DOI: https://doi.org/10.2210/pdb8B3Z/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2022-09-18 Released: 2023-08-23 
• Deposition Author(s): Evans, N.J., Isaacson, R.L., Collins, K.M., Camp, A.H.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.38 Å
• R-Value Free: 
  0.256 (Depositor), 0.262 (DCC) 
• R-Value Work: 
  0.198 (Depositor), 0.211 (DCC) 
• R-Value Observed: 
  0.201 (Depositor) 

Starting Model: experimental

Literature

Structural Analysis of Bacillus subtilis Sigma Factors.

Collins, K.M., Evans, N.J., Torpey, J.H., Harris, J.M., Haynes, B.A., Camp, A.H., Isaacson, R.L.

(2023) Microorganisms 11

• PubMed: 37110501 
• DOI: https://doi.org/10.3390/microorganisms11041077
• Primary Citation Related Structures: 
  8B3Z


• PubMed Abstract: 
  

  Bacteria use an array of sigma factors to regulate gene expression during different stages of their life cycles. Full-length, atomic-level structures of sigma factors have been challenging to obtain experimentally as a result of their many regions of intrinsic disorder. AlphaFold has now supplied plausible full-length models for most sigma factors. Here we discuss the current understanding of the structures and functions of sigma factors in the model organism, Bacillus subtilis , and present an X-ray crystal structure of a region of B. subtilis SigE, a sigma factor that plays a critical role in the developmental process of spore formation.

---

Organizational Affiliation: 
• Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK.
Department of Biological Sciences, Mount Holyoke College, 50 College Street, South Hadley, MA 01075, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 6-mer - A6 

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 56.41 kDa 
• Atom Count: 3,688 
• Modeled Residue Count: 464 
• Deposited Residue Count: 492 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA polymerase sigma factor	A, B, C, D, E, F	82	Bacillus subtilis	Mutation(s): 0  Gene Names: Bateq7PJ16_1703, SC09_Contig19orf01048
UniProt
Find proteins for P06222 (Bacillus subtilis (strain 168)) Explore P06222  Go to UniProtKB:  P06222

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.38 Å
• R-Value Free:  0.256 (Depositor), 0.262 (DCC) 
• R-Value Work:  0.198 (Depositor), 0.211 (DCC) 
• R-Value Observed: 0.201 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.953	α = 90
b = 165.143	β = 90
c = 98.93	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PHENIX	refinement
DIALS	data reduction
DIALS	data scaling
MrBUMP	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-08-23 
Deposition Author(s): Evans, N.J., Isaacson, R.L., Collins, K.M., Camp, A.H.

---

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	--

Revision History  

• Version 1.0: 2023-08-23
  Type: Initial release
  
• Version 1.1: 2023-08-30
  Changes: Database references
• Version 1.2: 2026-03-04
  Changes: Refinement description, Structure summary