View source for 7pu1


==High resolution X-ray structure of Thermoascus aurantiacus LPMO==
<StructureSection load='7pu1' size='340' side='right'caption='[[7pu1]], [[Resolution|resolution]] 1.06&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7pu1]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoascus_aurantiacus Thermoascus aurantiacus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7PU1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7PU1 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.06&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=HIC:4-METHYL-HISTIDINE'>HIC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7pu1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7pu1 OCA], [https://pdbe.org/7pu1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7pu1 RCSB], [https://www.ebi.ac.uk/pdbsum/7pu1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7pu1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/G3XAP7_THEAU G3XAP7_THEAU] Has endoglucanase activity on substrates containing beta-1,4 glycosidic bonds. Involved in the degradation of complex natural cellulosic substrates.[RuleBase:RU368122]
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== Publication Abstract from PubMed ==
Lytic Polysaccharide Monooxygenases (LPMOs) oxidatively cleave recalcitrant polysaccharides. The mechanism involves (i) reduction of the Cu, (ii) polysaccharide binding, (iii) binding of different oxygen species, and (iv) glycosidic bond cleavage. However, the complete mechanism is poorly understood and may vary across different families and even within the same family. Here, we have investigated the protonation state of a secondary co-ordination sphere histidine, conserved across AA9 family LPMOs that has previously been proposed to be a potential proton donor. Partial unrestrained refinement of newly obtained higher resolution data for two AA9 LPMOs and re-refinement of four additional data sets deposited in the PDB were carried out, where the His was refined without restraints, followed by measurements of the His ring geometrical parameters. This allowed reliable assignment of the protonation state, as also validated by following the same procedure for the His brace, for which the protonation state is predictable. The study shows that this histidine is generally singly protonated at the Nepsilon2 atom, which is close to the oxygen species binding site. Our results indicate robustness of the method. In view of this and other emerging evidence, a role as proton donor during catalysis is unlikely for this His.

Protonation State of an Important Histidine from High Resolution Structures of Lytic Polysaccharide Monooxygenases.,Banerjee S, Muderspach SJ, Tandrup T, Frandsen KEH, Singh RK, Ipsen JO, Hernandez-Rollan C, Norholm MHH, Bjerrum MJ, Johansen KS, Lo Leggio L Biomolecules. 2022 Jan 24;12(2). pii: biom12020194. doi: 10.3390/biom12020194. PMID:35204695<ref>PMID:35204695</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 7pu1" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermoascus aurantiacus]]
[[Category: Banerjee S]]
[[Category: Bjerrum MJ]]
[[Category: Frandsen KEH]]
[[Category: Lo Leggio L]]
[[Category: Singh RK]]