6EFV

The NADPH-dependent sulfite reductase flavoprotein adopts an extended conformation that is unique to this diflavin reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.341 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

NADPH-dependent sulfite reductase flavoprotein adopts an extended conformation unique to this diflavin reductase.

Tavolieri, A.M.Murray, D.T.Askenasy, I.Pennington, J.M.McGarry, L.Stanley, C.B.Stroupe, M.E.

(2019) J. Struct. Biol. --: --

  • DOI: 10.1016/j.jsb.2019.01.001

  • PubMed Abstract: 
  • This is the first X-ray crystal structure of the monomeric form of sulfite reductase (SiR) flavoprotein (SiRFP-60) that shows the relationship between its major domains in an extended position not seen before in any homologous diflavin reductases. Sm ...

    This is the first X-ray crystal structure of the monomeric form of sulfite reductase (SiR) flavoprotein (SiRFP-60) that shows the relationship between its major domains in an extended position not seen before in any homologous diflavin reductases. Small angle neutron scattering confirms this novel domain orientation also occurs in solution. Activity measurements of SiR and SiRFP variants allow us to propose a novel mechanism for electron transfer from the SiRFP reductase subunit to its oxidase metalloenzyme partner that, together, make up the SiR holoenzyme. Specifically, we propose that SiR performs its 6-electron reduction via intramolecular or intermolecular electron transfer. Our model explains both the significance of the stoichiometric mismatch between reductase and oxidase subunits in the holoenzyme and how SiR can handle such a large volume electron reduction reaction that is at the heart of the sulfur bio-geo cycle.


    Organizational Affiliation

    Department of Biological Science and Institute of Molecular Biophysics, 91 Chieftain Way, Tallahassee, FL 32306, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sulfite reductase [NADPH] flavoprotein alpha-component
A
569Escherichia coliMutation(s): 0 
Gene Names: cysJ
EC: 1.8.1.2
Find proteins for W8SX42 (Escherichia coli)
Go to UniProtKB:  W8SX42
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
FMN
Query on FMN

Download SDF File 
Download CCD File 
A
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
CXS
Query on CXS

Download SDF File 
Download CCD File 
A
3-CYCLOHEXYL-1-PROPYLSULFONIC ACID
C9 H19 N O3 S
PJWWRFATQTVXHA-UHFFFAOYSA-N
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.341 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 60.483α = 90.00
b = 99.739β = 90.00
c = 103.533γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (United States)United StatesMCB1149763

Revision History 

  • Version 1.0: 2019-02-27
    Type: Initial release