5vg0

Publication Abstract from PubMed

A 1.1 A resolution, room-temperature X-ray structure and a 2.1 A resolution neutron structure of a chitin-degrading lytic polysaccharide monooxygenase domain from the bacterium Jonesia denitrificans (JdLPMO10A) show a putative dioxygen species equatorially bound to the active site copper. Both structures show an elongated density for the dioxygen, most consistent with a Cu(II)-bound peroxide. The coordination environment is consistent with Cu(II). In the neutron and X-ray structures, difference maps reveal the N-terminal amino group, involved in copper coordination, is present as a mixed ND2 and ND-, suggesting a role for the copper ion in shifting the pKa of the amino terminus.

Neutron and Atomic Resolution X-ray Structures of a Lytic Polysaccharide Monooxygenase Reveal Copper-Mediated Dioxygen Binding and Evidence for N-Terminal Deprotonation.,Bacik JP, Mekasha S, Forsberg Z, Kovalevsky AY, Vaaje-Kolstad G, Eijsink VGH, Nix JC, Coates L, Cuneo MJ, Unkefer CJ, Chen JC Biochemistry. 2017 May 23;56(20):2529-2532. doi: 10.1021/acs.biochem.7b00019., Epub 2017 May 11. PMID:28481095^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.