6XO2

Structural Characterization of Beta Cyanoalanine Synthase from Tetranychus Urticae (two-spotted spider mite)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural and functional characterization of beta-cyanoalanine synthase from Tetranychus urticae.

Daneshian, L.Renggli, I.Hanaway, R.Offermann, L.R.Schlachter, C.R.Hernandez Arriaza, R.Henry, S.Prakash, R.Wybouw, N.Dermauw, W.Shimizu, L.S.Van Leeuwen, T.Makris, T.M.Grbic, V.Grbic, M.Chruszcz, M.

(2022) Insect Biochem Mol Biol 142: 103722-103722

  • DOI: https://doi.org/10.1016/j.ibmb.2022.103722
  • Primary Citation of Related Structures:  
    6XO2, 7MFJ

  • PubMed Abstract: 

    Tetranychus urticae is a polyphagous spider mite that can feed on more than 1100 plant species including cyanogenic plants. The herbivore genome contains a horizontally acquired gene tetur10g01570 (TuCAS) that was previously shown to participate in cyanide detoxification. To understand the structure and determine the function of TuCAS in T. urticae, crystal structures of the protein with lysine conjugated pyridoxal phosphate (PLP) were determined. These structures reveal extensive TuCAS homology with the β-substituted alanine synthase family, and they show that this enzyme utilizes a similar chemical mechanism involving a stable α-aminoacrylate intermediate in β-cyanoalanine and cysteine synthesis. We demonstrate that TuCAS is more efficient in the synthesis of β-cyanoalanine, which is a product of the detoxification reaction between cysteine and cyanide, than in the biosynthesis of cysteine. Also, the enzyme carries additional enzymatic activities that were not previously described. We show that TuCAS can detoxify cyanide using O-acetyl-L-serine as a substrate, leading to the direct formation of β-cyanoalanine. Moreover, it catalyzes the reaction between the TuCAS-bound α-aminoacrylate intermediate and aromatic compounds with a thiol group. In addition, we have tested several compounds as TuCAS inhibitors. Overall, this study identifies additional functions for TuCAS and provides new molecular insight into the xenobiotic metabolism of T. urticae.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-cyanoalanine synthase322Tetranychus urticaeMutation(s): 0 
Gene Names: 107363798
UniProt
Find proteins for T1KF23 (Tetranychus urticae)
Explore T1KF23 
Go to UniProtKB:  T1KF23
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupT1KF23
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.376α = 90
b = 64.376β = 90
c = 143.503γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000data scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institute of Food and Agriculture (NIFA, United States)United States2020-67014-31179

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-19
    Type: Initial release
  • Version 1.1: 2022-02-09
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description