8S5F image
Entry Detail
PDB ID:
8S5F
Keywords:
Title:
Crystal structure of the HExxH domain of ChlBHExxH a novel alpha-ketoglutarate dependent oxygenase
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-02-23
Release Date:
2024-10-02
Method Details:
Experimental Method:
Resolution:
2.80 Å
R-Value Free:
0.25
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ChlH from Chlorogloeopsis sp.
Chain IDs:A, B, C, D, E, F
Chain Length:368
Number of Molecules:6
Biological Source:Chlorogloeopsis sp.
Ligand Molecules
Primary Citation
Fused radical SAM and alpha KG-HExxH domain proteins contain a distinct structural fold and catalyse cyclophane formation and beta-hydroxylation.
Nat.Chem. 16 1882 1893 (2024)
PMID: 39294420 DOI: 10.1038/s41557-024-01596-9

Abstact

Two of nature's recurring binding motifs in metalloproteins are the CxxxCxxC motif in radical SAM enzymes and the 2-His-1-carboxylate motif found both in zincins and α-ketoglutarate and non-haem iron enzymes. Here we show the confluence of these two domains in a single post-translational modifying enzyme containing an N-terminal radical S-adenosylmethionine domain fused to a C-terminal 2-His-1-carboxylate (HExxH) domain. The radical SAM domain catalyses three-residue cyclophane formation and is the signature modification of triceptides, a class of ribosomally synthesized and post-translationally modified peptides. The HExxH domain is a defining feature of zinc metalloproteases. Yet the HExxH motif-containing domain studied here catalyses β-hydroxylation and is an α-ketoglutarate non-haem iron enzyme. We determined the crystal structure for this HExxH protein at 2.8 Å, unveiling a distinct structural fold, thus expanding the family of α-ketoglutarate non-haem iron enzymes with a class that we propose to name αKG-HExxH. αKG-HExxH proteins represent a unique family of ribosomally synthesized and post-translationally modified peptide modifying enzymes that can furnish opportunities for genome mining, synthetic biology and enzymology.

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