2Q6K

SalL with adenosine

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history. 


Literature

Discovery and characterization of a marine bacterial SAM-dependent chlorinase

Eustaquio, A.S., Pojer, F., Noel, J.P., Moore, B.S.

(2008) Nat Chem Biol 4: 69-74

  • DOI: 10.1038/nchembio.2007.56
  • Primary Citation of Related Structures:  
    2Q6I, 2Q6K, 2Q6L, 2Q6O

  • PubMed Abstract: 

    • Halogen atom incorporation into a scaffold of bioactive compounds often amplifies biological activity, as is the case for the anticancer agent salinosporamide A (1), a chlorinated natural product from the marine bacterium Salinispora tropica. Significant effort in understanding enzymatic chlorination shows that oxidative routes predominate to form reactive electrophilic or radical chlorine species ...

    Halogen atom incorporation into a scaffold of bioactive compounds often amplifies biological activity, as is the case for the anticancer agent salinosporamide A (1), a chlorinated natural product from the marine bacterium Salinispora tropica. Significant effort in understanding enzymatic chlorination shows that oxidative routes predominate to form reactive electrophilic or radical chlorine species. Here we report the genetic, biochemical and structural characterization of the chlorinase SalL, which halogenates S-adenosyl-L-methionine (2) with chloride to generate 5'-chloro-5'-deoxyadenosine (3) and L-methionine (4) in a rarely observed nucleophilic substitution strategy analogous to that of Streptomyces cattleya fluorinase. Further metabolic tailoring produces a halogenated polyketide synthase substrate specific for salinosporamide A biosynthesis. SalL also accepts bromide and iodide as substrates, but not fluoride. High-resolution crystal structures of SalL and active site mutants complexed with substrates and products support the S(N)2 nucleophilic substitution mechanism and further illuminate halide specificity in this newly discovered halogenase family.

    Organizational Affiliation: 

    Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA. bsmoore@ucsd.edu



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
chlorinaseA283Salinispora tropica CNB-440Mutation(s): 0 
Gene Names: salL, Strop_1026
EC: 2.5.1.94
UniProt
Find proteins for A4X3Q0 (Salinispora tropica (strain ATCC BAA-916 / DSM 44818 / CNB-440))
Explore A4X3Q0 
Go to UniProtKB:  A4X3Q0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA4X3Q0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADN
Query on ADN
Download Ideal Coordinates CCD File 
B [auth A]ADENOSINE
C10 H13 N5 O4
OIRDTQYFTABQOQ-KQYNXXCUSA-N		 Ligand Interaction
PEG
Query on PEG
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]		DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.21α = 90
b = 111.21β = 90
c = 93.18γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

  • Deposited Date: 2007-06-05 
  • Released Date: 2007-12-11 
    • Deposition Author(s): Pojer, F., Noel, J.P.

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Source and taxonomy, Version format compliance