Crystal structure of NADP(H):human thioredoxin reductase I

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Terpyridine-platinum(II) complexes are effective inhibitors of mammalian topoisomerases and human thioredoxin reductase 1.

Lo, Y.C.Ko, T.P.Su, W.C.Su, T.L.Wang, A.H.J.

(2009) J Inorg Biochem 103: 1082-1092

  • DOI: https://doi.org/10.1016/j.jinorgbio.2009.05.006
  • Primary Citation of Related Structures:  
    2ZZ0, 2ZZB, 2ZZC

  • PubMed Abstract: 

    Terpyridine-platinum(II) (TP-Pt(II)) complexes are known to possess DNA-intercalating activity and have been regarded as potential antitumor agents. However, their cytotoxic mechanism remains unclear. To investigate the possible mechanism, a series of TP-Pt(II) compounds were prepared and their biological activities assessed. The DNA binding activities of the aromatic thiolato[TP-Pt(II)] complexes were stronger than the aliphatic 2-hydroxylethanethiolato(2,2':6',2''-terpyridine)platinum(II) [TP(HET)]. TP-Pt(II) complexes inhibited topoisomerase IIalpha or topoisomerase I activity at IC(50) values of about 5 microM and 10-20 microM, respectively, whereas the human thioredoxin reductase 1 (hTrxR1) activity was inhibited with IC(50) values in the range of 58-78 nM. At the cellular level, they possessed cytotoxicity with IC(50) values between 7 and 19 microM against HeLa cells. Additionally, using X-ray crystallography and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, we elucidated that the TP-Pt(II) complexes inhibited hTrxR1 activity by blocking its C-terminal active-site selenocysteine. Therefore, TP-Pt(II) complexes possess inhibitory activities against multiple biological targets, and they may be further studied as anticancer agents.

  • Organizational Affiliation

    Department and Institute of Pharmacology, National Yang-Ming University, Taipei, Taiwan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thioredoxin reductase 1, cytoplasmic
A, B, C, D
513Homo sapiensMutation(s): 0 
Gene Names: TXNRD1KDRF
UniProt & NIH Common Fund Data Resources
Find proteins for Q16881 (Homo sapiens)
Explore Q16881 
Go to UniProtKB:  Q16881
GTEx:  ENSG00000198431 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16881
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.862α = 90
b = 135.174β = 90
c = 346.635γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-11
    Changes: Refinement description
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description