6Q6T

Crystal structure (orthorombic form) of C36S mutant of thioredoxin h1 from Chlamydomonas reinhardtii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.94 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural and Biochemical Insights into the Reactivity of Thioredoxin h1 fromChlamydomonas reinhardtii.

Marchand, C.H.Fermani, S.Rossi, J.Gurrieri, L.Tedesco, D.Henri, J.Sparla, F.Trost, P.Lemaire, S.D.Zaffagnini, M.

(2019) Antioxidants (Basel) 8: --

  • DOI: 10.3390/antiox8010010
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Thioredoxins (TRXs) are major protein disulfide reductases of the cell. Their redox activity relies on a conserved Trp-Cys-(Gly/Pro)-Pro-Cys active site bearing two cysteine (Cys) residues that can be found either as free thiols (reduced TRXs) or lin ...

    Thioredoxins (TRXs) are major protein disulfide reductases of the cell. Their redox activity relies on a conserved Trp-Cys-(Gly/Pro)-Pro-Cys active site bearing two cysteine (Cys) residues that can be found either as free thiols (reduced TRXs) or linked together by a disulfide bond (oxidized TRXs) during the catalytic cycle. Their reactivity is crucial for TRX activity, and depends on the active site microenvironment. Here, we solved and compared the 3D structure of reduced and oxidized TRX h1 from Chlamydomonas reinhardtii (CrTRXh1). The three-dimensional structure was also determined for mutants of each active site Cys. Structural alignments of CrTRXh1 with other structurally solved plant TRXs showed a common spatial fold, despite the low sequence identity. Structural analyses of CrTRXh1 revealed that the protein adopts an identical conformation independently from its redox state. Treatment with iodoacetamide (IAM), a Cys alkylating agent, resulted in a rapid and pH-dependent inactivation of CrTRXh1. Starting from fully reduced CrTRXh1, we determined the acid dissociation constant (p K a ) of each active site Cys by Matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry analyses coupled to differential IAM-based alkylation. Based on the diversity of catalytic Cys deprotonation states, the mechanisms and structural features underlying disulfide redox activity are discussed.


    Organizational Affiliation

    Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, Institut de Biologie Physico-Chimique, Unité Mixte de Recherche 8226 CNRS Sorbonne Université, 13 rue Pierre et Marie Curie, 75005 Paris, France. stephane.lemaire@ibpc.fr.,Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. jacopo.rossi13@studio.unibo.it.,Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. libero.gurrieri2@unibo.it.,Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. mirko.zaffagnini3@unibo.it.,Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, Institut de Biologie Physico-Chimique, Unité Mixte de Recherche 8226 CNRS Sorbonne Université, 13 rue Pierre et Marie Curie, 75005 Paris, France. christophe.marchand@ibpc.fr.,Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. francesca.sparla@unibo.it.,Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, Institut de Biologie Physico-Chimique, Unité Mixte de Recherche 8226 CNRS Sorbonne Université, 13 rue Pierre et Marie Curie, 75005 Paris, France. julien.henri@ibpc.fr.,Department of Chemistry "Giacomo Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy. simona.fermani@unibo.it.,Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. paolo.trost@unibo.it.,Bio-Pharmaceutical Analysis Section (Bio-PhASe), Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy. daniele.tedesco@unibo.it.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin H-type
A
113Chlamydomonas reinhardtiiMutation(s): 1 
Gene Names: TRXH
Find proteins for P80028 (Chlamydomonas reinhardtii)
Go to UniProtKB:  P80028
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download SDF File 
Download CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.94 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.157 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 60.777α = 90.00
b = 34.815β = 90.00
c = 48.158γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
PHENIXrefinement
Aimlessdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
ItalyFARB2012-University of Bologna

Revision History 

  • Version 1.0: 2019-01-16
    Type: Initial release