8H6U

Class I sesquiterpene synthase BCBOT2 (complex)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 

Starting Model: in silico
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Ligand Structure Quality Assessment 


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Literature

Structural Insights into Three Sesquiterpene Synthases for the Biosynthesis of Tricyclic Sesquiterpenes and Chemical Space Expansion by Structure-Based Mutagenesis.

Lou, T.Li, A.Xu, H.Pan, J.Xing, B.Wu, R.Dickschat, J.S.Yang, D.Ma, M.

(2023) J Am Chem Soc 

  • DOI: https://doi.org/10.1021/jacs.3c00278
  • Primary Citation of Related Structures:  
    8H4P, 8H6Q, 8H6U, 8H72

  • PubMed Abstract: 

    The cyclization of farnesyl diphosphate (FPP) into highly strained polycyclic sesquiterpenes is challenging. We here determined the crystal structures of three sesquiterpene synthases (STSs, namely, BcBOT2, DbPROS, and CLM1) catalyzing the biosynthesis of the tricyclic sesquiterpenes presilphiperfolan-8β-ol ( 1 ), Δ 6 -protoilludene ( 2 ), and longiborneol ( 3 ). All three STS structures contain a substrate mimic, the benzyltriethylammonium cation (BTAC), in their active sites, providing ideal templates for quantum mechanics/molecular mechanics (QM/MM) analyses toward their catalytic mechanisms. The QM/MM-based molecular dynamics (MD) simulations revealed the cascade reactions toward the enzyme products, and different key active site residues that play important roles in stabilizing reactive carbocation intermediates along the three pathways. Site-directed mutagenesis experiments confirmed the roles of these key residues and concomitantly resulted in 17 shunt products ( 4 - 20 ). Isotopic labeling experiments addressed the key hydride and methyl migrations toward the main and several shunt products. These combined methods provided deep insights into the catalytic mechanisms of the three STSs and demonstrated how the chemical space of STSs can rationally be expanded, which may facilitate applications in synthetic biology approaches toward pharmaceutical and perfumery agents.


  • Organizational Affiliation

    State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Haidian District, Beijing 100191, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Presilphiperfolan-8-beta-ol synthase
A, B, C, D
366Botrytis cinereaMutation(s): 0 
Gene Names: BOT2CND15
EC: 4.2.3.74
UniProt
Find proteins for Q6WP50 (Botryotinia fuckeliana)
Explore Q6WP50 
Go to UniProtKB:  Q6WP50
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6WP50
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
BTM (Subject of Investigation/LOI)
Query on BTM

Download Ideal Coordinates CCD File 
I [auth A],
N [auth B],
S [auth C],
X [auth D]
N-benzyl-N,N-diethylethanaminium
C13 H22 N
VBQDSLGFSUGBBE-UHFFFAOYSA-N
POP (Subject of Investigation/LOI)
Query on POP

Download Ideal Coordinates CCD File 
H [auth A],
M [auth B],
R [auth C],
W [auth D]
PYROPHOSPHATE 2-
H2 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-L
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
J [auth B]
K [auth B]
E [auth A],
F [auth A],
G [auth A],
J [auth B],
K [auth B],
L [auth B],
O [auth C],
P [auth C],
Q [auth C],
T [auth D],
U [auth D],
V [auth D]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.78 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.544α = 90
b = 112.544β = 90
c = 253.567γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China22077007, 21877002

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-23
    Type: Initial release