View source for 1h82


==STRUCTURE OF POLYAMINE OXIDASE IN COMPLEX WITH GUAZATINE==
<StructureSection load='1h82' size='340' side='right'caption='[[1h82]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1h82]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Zea_mays Zea mays]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H82 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1H82 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=FCA:ALPHA-D-FUCOSE'>FCA</scene>, <scene name='pdbligand=GZZ:N-{8-[(8-{[(E)-AMINO(IMINO)METHYL]AMINO}OCTYL)AMINO]OCTYL}GUANIDINE'>GZZ</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</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=1h82 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h82 OCA], [https://pdbe.org/1h82 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1h82 RCSB], [https://www.ebi.ac.uk/pdbsum/1h82 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1h82 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PAO1_MAIZE PAO1_MAIZE] Flavoenzyme involved in polyamine back-conversion (Ref.4, PubMed:16331971). Catalyzes the oxidation of the secondary amino group of polyamines, such as spermine, spermidine and their acetyl derivatives (Ref.4, PubMed:16331971). Plays an important role in the regulation of polyamine intracellular concentration (Probable).<ref>PMID:16331971</ref> <ref>PMID:16331971</ref> <ref>PMID:16331971</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h8/1h82_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1h82 ConSurf].
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== Publication Abstract from PubMed ==
Polyamine oxidase (PAO) carries out the FAD-dependent oxidation of the secondary amino groups of spermidine and spermine, a key reaction in the polyamine catabolism. The active site of PAO consists of a 30 A long U-shaped catalytic tunnel, whose innermost part is located in front of the flavin ring. To provide insight into the PAO substrate specificity and amine oxidation mechanism, we have investigated the crystal structure of maize PAO in the reduced state and in complex with three different inhibitors, guazatine, 1,8-diaminooctane, and N(1)-ethyl-N(11)-[(cycloheptyl)methyl]-4,8-diazaundecane (CHENSpm). In the reduced state, the conformation of the isoalloxazine ring and the surrounding residues is identical to that of the oxidized enzyme. Only Lys300 moves away from the flavin to compensate for the change in cofactor protonation occurring upon reduction. The structure of the PAO.inhibitor complexes reveals an exact match between the inhibitors and the PAO catalytic tunnel. Inhibitor binding does not involve any protein conformational change. Such lock-and-key binding occurs also in the complex with CHENSpm, which forms a covalent adduct with the flavin N5 atom. Comparison of the enzyme complexes hints at an "out-of-register" mechanism of inhibition, in which the inhibitor secondary amino groups are not properly aligned with respect to the flavin to allow oxidation. Except for the Glu62-Glu170 pair, no negatively charged residues are involved in the recognition of substrate and inhibitor amino groups, which is in contrast to other polyamine binding proteins. This feature may be exploited in the design of drugs specifically targeting PAO.

Structural bases for inhibitor binding and catalysis in polyamine oxidase.,Binda C, Angelini R, Federico R, Ascenzi P, Mattevi A Biochemistry. 2001 Mar 6;40(9):2766-76. PMID:11258887<ref>PMID:11258887</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 1h82" style="background-color:#fffaf0;"></div>

==See Also==
*[[Polyamine oxidase|Polyamine oxidase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Zea mays]]
[[Category: Angelini R]]
[[Category: Ascenzi P]]
[[Category: Binda C]]
[[Category: Coda A]]
[[Category: Federico R]]
[[Category: Mattevi A]]