5V12 image
Deposition Date 2017-03-01
Release Date 2018-03-07
Last Version Date 2024-05-01
Entry Detail
PDB ID:
5V12
Keywords:
Title:
Crystal structure of Carbon Sulfoxide lyase, Egt2 Y134F with sulfenic acid intermediate
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.45 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Hercynylcysteine sulfoxide lyase
Gene (Uniprot):egt-2
Chain IDs:E (auth: C)
Chain Length:501
Number of Molecules:1
Biological Source:Neurospora crassa OR74A
Polymer Type:polypeptide(L)
Molecule:Hercynylcysteine sulfoxide lyase
Gene (Uniprot):egt-2
Chain IDs:A (auth: E), B (auth: G), C (auth: F), D (auth: H), F (auth: D), G (auth: A), H (auth: B)
Chain Length:501
Number of Molecules:7
Biological Source:Neurospora crassa OR74A
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
EXA E LYS modified residue
LLP A LYS modified residue
Primary Citation
Snapshots of C-S Cleavage in Egt2 Reveals Substrate Specificity and Reaction Mechanism.
Cell Chem Biol 25 519 529.e4 (2018)
PMID: 29503207 DOI: 10.1016/j.chembiol.2018.02.002

Abstact

Sulfur incorporation in the biosynthesis of ergothioneine, a histidine thiol derivative, differs from other well-characterized transsulfurations. A combination of a mononuclear non-heme iron enzyme-catalyzed oxidative C-S bond formation and a subsequent pyridoxal 5'-phosphate (PLP)-mediated C-S lyase reaction leads to the net transfer of a sulfur atom from a cysteine to a histidine. In this study, we structurally and mechanistically characterized a PLP-dependent C-S lyase Egt2, which mediates the sulfoxide C-S bond cleavage in ergothioneine biosynthesis. A cation-π interaction between substrate and enzyme accounts for Egt2's preference of sulfoxide over thioether as a substrate. Using mutagenesis and structural biology, we captured three distinct states of the Egt2 C-S lyase reaction cycle, including a labile sulfenic intermediate captured in Egt2 crystals. Chemical trapping and high-resolution mass spectrometry were used to confirm the involvement of the sulfenic acid intermediate in Egt2 catalysis.

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Primary Citation of related structures