8PQ4 | pdb_00008pq4

Structure of HosA transcriptional regulator from enteropathogenic Escherichia coli O127:H6 (strain E2348/69)

• PDB DOI: https://doi.org/10.2210/pdb8PQ4/pdb
• Entry: 8PQ4 supersedes: 7Z4P, 7ZP4

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli O127:H6 str. E2348/69
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2023-07-10 Released: 2023-07-19 
• Deposition Author(s): Arpita, G., Kavyashree, M., Kannika, B.R., Madan Kumar, S.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 
  0.258 (Depositor), 0.259 (DCC) 
• R-Value Work: 
  0.212 (Depositor), 0.213 (DCC) 
• R-Value Observed: 
  0.214 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of a MarR family transcriptional regulator protein

Goswami, A., Ravindranath, K.B., Shankar, M.K.

(2024) bioRxiv 

• DOI: https://doi.org/10.1101/2024.06.07.597875

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: 16.65 kDa 
• Atom Count: 1,127 
• Modeled Residue Count: 130 
• Deposited Residue Count: 143 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcriptional regulator HosA	A	143	Escherichia coli O127:H6 str. E2348/69	Mutation(s): 0  Gene Names: hosA, E2348C_3010
UniProt
Find proteins for P69782 (Escherichia coli O127:H6 (strain E2348/69 / EPEC)) Explore P69782  Go to UniProtKB:  P69782

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO (Subject of Investigation/LOI)	B [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free:  0.258 (Depositor), 0.259 (DCC) 
• R-Value Work:  0.212 (Depositor), 0.213 (DCC) 
• R-Value Observed: 0.214 (Depositor) 

Space Group: P 4₃ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 67.16	α = 90
b = 67.16	β = 90
c = 95.66	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
MAR345	data collection
iMOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-07-19 
Deposition Author(s): Arpita, G., Kavyashree, M., Kannika, B.R., Madan Kumar, S.
• This entry supersedes: 7Z4P, 7ZP4

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Funding Organization	Location	Grant Number
Not funded	India	--

Revision History  

• Version 1.0: 2023-07-19
  Type: Initial release
  
• Version 1.1: 2024-06-19
  Changes: Data collection
• Version 1.2: 2025-01-29
  Changes: Advisory, Database references, Structure summary