5LSV image
Entry Detail
PDB ID:
5LSV
Title:
X-ray crystal structure of AA13 LPMO
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2016-09-05
Release Date:
2017-01-18
Method Details:
Experimental Method:
Resolution:
1.10 Å
R-Value Free:
0.12
R-Value Work:
0.10
R-Value Observed:
0.10
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:AoAA13
Chain IDs:A
Chain Length:233
Number of Molecules:1
Biological Source:Aspergillus oryzae RIB40
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
HIC A HIS modified residue
Peptide-like Molecules
PRD_900001
Primary Citation
Learning from oligosaccharide soaks of crystals of an AA13 lytic polysaccharide monooxygenase: crystal packing, ligand binding and active-site disorder.
Acta Crystallogr D Struct Biol 73 64 76 (2017)
PMID: 28045386 DOI: 10.1107/S2059798316019641

Abstact

Lytic polysaccharide monooxygenases (LPMOs) are a class of copper-dependent enzymes discovered within the last ten years. They oxidatively cleave polysaccharides (chitin, lignocellulose, hemicellulose and starch-derived), presumably making recalcitrant substrates accessible to glycoside hydrolases. Recently, the first crystal structure of an LPMO-substrate complex was reported, giving insights into the interaction of LPMOs with β-linked substrates (Frandsen et al., 2016). The LPMOs acting on α-linked glycosidic bonds (family AA13) display binding surfaces that are quite different from those of LPMOs that act on β-linked glycosidic bonds (families AA9-AA11), as revealed from the first determined structure (Lo Leggio et al., 2015), and thus presumably the AA13s interact with their substrate in a distinct fashion. Here, several new structures of the same AA13 enzyme, Aspergillus oryzae AA13, are presented. Crystals obtained in the presence of high zinc-ion concentrations were used, as they can be obtained more reproducibly than those used to refine the deposited copper-containing structure. One structure with an ordered zinc-bound active site was solved at 1.65 Å resolution, and three structures from crystals soaked with maltooligosaccharides in solutions devoid of zinc ions were solved at resolutions of up to 1.10 Å. Despite similar unit-cell parameters, small rearrangements in the crystal packing occur when the crystals are depleted of zinc ions, resulting in a more occluded substrate-binding surface. In two of the three structures maltooligosaccharide ligands are bound, but not at the active site. Two of the structures presented show a His-ligand conformation that is incompatible with metal-ion binding. In one of these structures this conformation is the principal one (80% occupancy), giving a rare atomic resolution view of a substantially misfolded enzyme that is presumably rendered inactive.

Legend

Protein

Chemical

Disease

Primary Citation of related structures