5ESC

Crystal structure of Group A Streptococcus HupZ


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

In vitro heme biotransformation by the HupZ enzyme from Group A streptococcus.

Sachla, A.J.Ouattara, M.Romero, E.Agniswamy, J.Weber, I.T.Gadda, G.Eichenbaum, Z.

(2016) Biometals 29: 593-609

  • DOI: 10.1007/s10534-016-9937-1

  • PubMed Abstract: 
  • In Group A streptococcus (GAS), the metallorepressor MtsR regulates iron homeostasis. Here we describe a new MtsR-repressed gene, which we named hupZ (heme utilization protein). A recombinant HupZ protein was purified bound to heme from Escherichia c ...

    In Group A streptococcus (GAS), the metallorepressor MtsR regulates iron homeostasis. Here we describe a new MtsR-repressed gene, which we named hupZ (heme utilization protein). A recombinant HupZ protein was purified bound to heme from Escherichia coli grown in the presence of 5-aminolevulinic acid and iron. HupZ specifically binds heme with stoichiometry of 1:1. The addition of NADPH to heme-bound HupZ (in the presence of cytochrome P450 reductase, NADPH-regeneration system and catalase) triggered progressive decrease of the HupZ Soret band and the appearance of an absorption peak at 660 nm that was resistance to hydrolytic conditions. No spectral changes were observed when ferredoxin and ferredoxin reductase were used as redox partners. Differential spectroscopy with myoglobin or with the ferrous chelator, ferrozine, confirmed that carbon monoxide and free iron are produced during the reaction. ApoHupZ was crystallized as a homodimer with a split β-barrel conformation in each monomer comprising six β strands and three α helices. This structure resembles the split β-barrel domain shared by the members of a recently described family of heme degrading enzymes. However, HupZ is smaller and lacks key residues found in the proteins of the latter group. Phylogenetic analysis places HupZ on a clade separated from those for previously described heme oxygenases. In summary, we have identified a new GAS enzyme-containing split β-barrel and capable of heme biotransformation in vitro; to the best of our knowledge, this is the first enzyme among Streptococcus species with such activity.


    Organizational Affiliation

    Department of Biology, College of Arts and Sciences, Georgia State University, P.O. Box 4010, Atlanta, GA, 30302-4010, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HupZ
A, B, C, D
133Streptococcus pyogenes serotype M2 (strain MGAS10270)Mutation(s): 0 
N/A
Find proteins for Q1JHG0 (Streptococcus pyogenes serotype M2 (strain MGAS10270))
Go to UniProtKB:  Q1JHG0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 41.823α = 78.59
b = 61.181β = 86.76
c = 61.347γ = 80.07
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-05-25
    Type: Initial release
  • Version 1.1: 2016-08-17
    Type: Database references