6I19 | pdb_00006i19

Crystal structure of Chlamydomonas reinhardtii thioredoxin h1

• PDB DOI: https://doi.org/10.2210/pdb6I19/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Chlamydomonas reinhardtii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2018-10-27 Released: 2018-12-05 
• Deposition Author(s): Lemaire, S.D., Tedesco, D., Crozet, P., Michelet, L., Fermani, S., Zaffagnini, M., Henri, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.38 Å
• R-Value Free: 
  0.216 (Depositor), 0.217 (DCC) 
• R-Value Work: 
  0.181 (Depositor), 0.182 (DCC) 
• R-Value Observed: 
  0.183 (Depositor) 

Starting Model: experimental

Literature

Crystal Structure of Chloroplastic Thioredoxin f2 fromChlamydomonas reinhardtiiReveals Distinct Surface Properties.

Lemaire, S.D., Tedesco, D., Crozet, P., Michelet, L., Fermani, S., Zaffagnini, M., Henri, J.

(2018) Antioxidants (Basel) 7

• PubMed: 30477165 
• DOI: https://doi.org/10.3390/antiox7120171
• Primary Citation Related Structures: 
  6I19, 6I1C


• PubMed Abstract: 
  

  Protein disulfide reduction by thioredoxins (TRXs) controls the conformation of enzyme active sites and their multimeric complex formation. TRXs are small oxidoreductases that are broadly conserved in all living organisms. In photosynthetic eukaryotes, TRXs form a large multigenic family, and they have been classified in different types: f, m, x, y, and z types are chloroplastic, while o and h types are located in mitochondria and cytosol. In the model unicellular alga Chlamydomonas reinhardtii , the TRX family contains seven types, with f- and h-types represented by two isozymes. Type-f TRXs interact specifically with targets in the chloroplast, controlling photosynthetic carbon fixation by the Calvin⁻Benson cycle. We solved the crystal structures of TRX f2 and TRX h1 from C. reinhardtii . The systematic comparison of their atomic features revealed a specific conserved electropositive crown around the active site of TRX f, complementary to the electronegative surface of their targets. We postulate that this surface provides specificity to each type of TRX.

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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. [e-mail].
Bio-Pharmaceutical Analysis Section (Bio-PhASe), Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy. [e-mail].
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. [e-mail].
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. [e-mail].
Department of Chemistry "Giacomo Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy. [e-mail].
Laboratory of Molecular Plant Physiology, Department of Pharmacy and Biotechnology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. [e-mail].
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. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 23.72 kDa 
• Atom Count: 2,033 
• Modeled Residue Count: 222 
• Deposited Residue Count: 226 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin H-type	A, B	113	Chlamydomonas reinhardtii	Mutation(s): 0  Gene Names: TRXH
UniProt
Find proteins for P80028 (Chlamydomonas reinhardtii) Explore P80028  Go to UniProtKB:  P80028

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.38 Å
• R-Value Free:  0.216 (Depositor), 0.217 (DCC) 
• R-Value Work:  0.181 (Depositor), 0.182 (DCC) 
• R-Value Observed: 0.183 (Depositor) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 48.76	α = 90
b = 48.76	β = 90
c = 143.97	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XDS	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2018-12-05 
Deposition Author(s): Lemaire, S.D., Tedesco, D., Crozet, P., Michelet, L., Fermani, S., Zaffagnini, M., Henri, J.

Revision History  

• Version 1.0: 2018-12-05
  Type: Initial release
  
• Version 1.1: 2024-01-24
  Changes: Data collection, Database references, Refinement description
• Version 1.2: 2024-10-09
  Changes: Structure summary