5WL7

Crystal structure of chalcone isomerase engineered from ancestral inference (ancCHI*)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Evolution of chalcone isomerase from a noncatalytic ancestor.

Kaltenbach, M.Burke, J.R.Dindo, M.Pabis, A.Munsberg, F.S.Rabin, A.Kamerlin, S.C.L.Noel, J.P.Tawfik, D.S.

(2018) Nat Chem Biol 14: 548-555

  • DOI: 10.1038/s41589-018-0042-3
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The emergence of catalysis in a noncatalytic protein scaffold is a rare, unexplored event. Chalcone isomerase (CHI), a key enzyme in plant flavonoid biosynthesis, is presumed to have evolved from a nonenzymatic ancestor related to the widely distribu ...

    The emergence of catalysis in a noncatalytic protein scaffold is a rare, unexplored event. Chalcone isomerase (CHI), a key enzyme in plant flavonoid biosynthesis, is presumed to have evolved from a nonenzymatic ancestor related to the widely distributed fatty-acid binding proteins (FAPs) and a plant protein family with no isomerase activity (CHILs). Ancestral inference supported the evolution of CHI from a protein lacking isomerase activity. Further, we identified four alternative founder mutations, i.e., mutations that individually instated activity, including a mutation that is not phylogenetically traceable. Despite strong epistasis in other cases of protein evolution, CHI's laboratory reconstructed mutational trajectory shows weak epistasis. Thus, enantioselective CHI activity could readily emerge despite a catalytically inactive starting point. Accordingly, X-ray crystallography, NMR, and molecular dynamics simulations reveal reshaping of the active site toward a productive substrate-binding mode and repositioning of the catalytic arginine that was inherited from the ancestral fatty-acid binding proteins.


    Organizational Affiliation

    Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot, Israel. dan.tawfik@weizmann.ac.il.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Engineered Chalcone Isomerase ancCHI*A226unidentifiedMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.178 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.44α = 90
b = 65.44β = 90
c = 94.14γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-05-09
    Type: Initial release
  • Version 1.1: 2018-05-30
    Changes: Data collection, Database references