8K5I

The structure of SenA in complex with N,N,N-trimethyl-histidine and thioglucose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.168 

Starting Model: experimental
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Literature

Structural insights into a novel nonheme iron-dependent oxygenase in selenoneine biosynthesis.

Liu, M.Yang, Y.Huang, J.W.Dai, L.Zheng, Y.Cheng, S.He, H.Chen, C.C.Guo, R.T.

(2023) Int J Biol Macromol 256: 128428-128428

  • DOI: https://doi.org/10.1016/j.ijbiomac.2023.128428
  • Primary Citation of Related Structures:  
    8K5I, 8K5J, 8K5K

  • PubMed Abstract: 

    Selenoneine (SEN) is a natural histidine derivative with radical-scavenging activity and shows higher antioxidant potential than its sulfur-containing isolog ergothioneine (EGT). Recently, the SEN biosynthetic pathway in Variovorax paradoxus was reported. Resembling EGT biosynthesis, the committed step of SEN synthesis is catalyzed by a nonheme Fe-dependent oxygenase termed SenA. This enzyme catalyzes oxidative carbon‑selenium (C-Se) bond formation to conjugate N-α-trimethyl histidine (TMH) and selenosugar to yield selenoxide; the process parallels the EGT biosynthetic route, in which sulfoxide synthases known as EgtB members catalyze the conjugation of TMH and cysteine or γ-glutamylcysteine to afford sulfoxides. Here, we report the crystal structures of SenA and its complex with TMH and thioglucose (SGlc), an analog of selenoglucose (SeGlc) at high resolution. The overall structure of SenA adopts the archetypical fold of EgtB, which comprises a DinB-like domain and an FGE-like domain. While the TMH-binding site is highly conserved to that of EgtB, a various substrate-enzyme interaction network in the selenosugar-binding site of SenA features a number of water-mediated hydrogen bonds. The obtained structural information is beneficial for understanding the mechanism of SenA-mediated C-Se bond formation.


  • Organizational Affiliation

    State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, 430062, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
selenoneine synthase SenA427Variovorax paradoxusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
AVJ (Subject of Investigation/LOI)
Query on AVJ

Download Ideal Coordinates CCD File 
C [auth A]N,N,N-trimethyl-histidine
C9 H16 N3 O2
GPPYTCRVKHULJH-QMMMGPOBSA-O
GS1 (Subject of Investigation/LOI)
Query on GS1

Download Ideal Coordinates CCD File 
D [auth A]1-thio-beta-D-glucopyranose
C6 H12 O5 S
JUSMHIGDXPKSID-DVKNGEFBSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
G [auth A]DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
FE (Subject of Investigation/LOI)
Query on FE

Download Ideal Coordinates CCD File 
B [auth A]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.168 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.641α = 90
b = 95.895β = 90
c = 61.846γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SAINTdata scaling
SAINTdata reduction
PHASERphasing
PDB_EXTRACTdata extraction

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)China32101016

Revision History  (Full details and data files)

  • Version 1.0: 2023-12-06
    Type: Initial release
  • Version 1.1: 2023-12-13
    Changes: Database references