3LFY

CTD of Tarocystatin in complex with papain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Crystal structure of tarocystatin-papain complex: implications for the inhibition property of group-2 phytocystatins.

Chu, M.H.Liu, K.L.Wu, H.Y.Yeh, K.W.Cheng, Y.S.

(2011) Planta 234: 243-254

  • DOI: https://doi.org/10.1007/s00425-011-1398-8
  • Primary Citation of Related Structures:  
    3IMA, 3LFY

  • PubMed Abstract: 

    Tarocystatin (CeCPI) from taro (Colocasia esculenta cv. Kaohsiung no. 1), a group-2 phytocystatin, shares a conserved N-terminal cystatin domain (NtD) with other phytocystatins but contains a C-terminal cystatin-like extension (CtE). The structure of the tarocystatin-papain complex and the domain interaction between NtD and CtE in tarocystatin have not been determined. We resolved the crystal structure of the phytocystatin-papain complex at resolution 2.03 Å. Surprisingly, the structure of the NtD-papain complex in a stoichiometry of 1:1 could be built, with no CtE observed. Only two remnant residues of CtE could be built in the structure of the CtE-papain complex. Therefore, CtE is easily digested by papain. To further characterize the interaction between NtD and CtE, three segments of tarocystatin, including the full-length (FL), NtD and CtE, were used to analyze the domain-domain interaction and the inhibition ability. The results from glutaraldehyde cross-linking and yeast two-hybrid assay indicated the existence of an intrinsic flexibility in the region linking NtD and CtE for most tarocystatin molecules. In the inhibition activity assay, the glutathione-S-transferase (GST)-fused FL showed the highest inhibition ability without residual peptidase activity, and GST-NtD and FL showed almost the same inhibition ability, which was higher than with NtD alone. On the basis of the structures, the linker flexibility and inhibition activity of tarocystatins, we propose that the overhangs from the cystatin domain may enhance the inhibition ability of the cystatin domain against papain.


  • Organizational Affiliation

    Department of Life Science and Institute of Plant Biology, National Taiwan University, No 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan, ROC.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PapainA,
B [auth C]
212Carica papayaMutation(s): 0 
EC: 3.4.22.2
UniProt
Find proteins for P00784 (Carica papaya)
Explore P00784 
Go to UniProtKB:  P00784
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00784
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.89α = 90
b = 48.89β = 90
c = 200.87γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-11-18
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description
  • Version 1.4: 2023-11-22
    Changes: Data collection