6CQB

Crystal Structure of Piper methysticum Chalcone Synthase

  • Classification: TRANSFERASE
  • Organism(s): Piper methysticum
  • Expression System: Escherichia coli BL21(DE3)
  • Mutation(s): No 

  • Deposited: 2018-03-14 Released: 2018-04-11 
  • Deposition Author(s): Pluskal, T., Weng, J.K.
  • Funding Organization(s): Edward N. and Della L. Thome Memorial Foundation, Family Larsson-Rosenquist Foundation, Arnold and Mabel Beckman Foundation, National Science Foundation (NSF, United States), Pew Charitable Trusts, Chicago Community Trust, Helen Hay Whitney Foundation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.268 

Starting Model: in silico
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

The biosynthetic origin of psychoactive kavalactones in kava.

Pluskal, T.Torrens-Spence, M.P.Fallon, T.R.De Abreu, A.Shi, C.H.Weng, J.K.

(2019) Nat Plants 5: 867-878

  • DOI: https://doi.org/10.1038/s41477-019-0474-0
  • Primary Citation of Related Structures:  
    6CQB, 6NBR, 6OP5

  • PubMed Abstract: 

    Kava (Piper methysticum) is an ethnomedicinal shrub native to the Polynesian islands with well-established anxiolytic and analgesic properties. Its main psychoactive principles, kavalactones, form a unique class of polyketides that interact with the human central nervous system through mechanisms distinct from those of conventional psychiatric drugs. However, an unknown biosynthetic machinery and difficulty in chemical synthesis hinder the therapeutic use of kavalactones. In addition, kava also produces flavokavains, which are chalconoids with anticancer properties structurally related to kavalactones. Here, we report de novo elucidation of the key enzymes of the kavalactone and flavokavain biosynthetic network. We present the structural basis for the evolutionary development of a pair of paralogous styrylpyrone synthases that establish the kavalactone scaffold and the catalytic mechanism of a regio- and stereo-specific kavalactone reductase that produces a subset of chiral kavalactones. We further demonstrate the feasibility of engineering styrylpyrone production in heterologous hosts, thus opening a way to develop kavalactone-based non-addictive psychiatric therapeutics through synthetic biology.


  • Organizational Affiliation

    Whitehead Institute for Biomedical Research, Cambridge, MA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chalcone synthase
A, B
394Piper methysticumMutation(s): 0 
Gene Names: CHS
UniProt
Find proteins for A0A384E133 (Piper methysticum)
Explore A0A384E133 
Go to UniProtKB:  A0A384E133
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A384E133
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.268 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.91α = 90
b = 120.57β = 90
c = 125.408γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Edward N. and Della L. Thome Memorial FoundationUnited States--
Family Larsson-Rosenquist FoundationUnited States--
Arnold and Mabel Beckman FoundationUnited States--
National Science Foundation (NSF, United States)United States1709616
Pew Charitable TrustsUnited States27345
Chicago Community TrustUnited States15-SSP-162
Helen Hay Whitney FoundationUnited StatesF-1055

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-11
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.4: 2024-03-13
    Changes: Advisory, Data collection, Database references
  • Version 1.5: 2024-04-03
    Changes: Refinement description