This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1asq

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

X-RAY STRUCTURES AND MECHANISTIC IMPLICATIONS OF THREE FUNCTIONAL DERIVATIVES OF ASCORBATE OXIDASE FROM ZUCCHINI: REDUCED-, PEROXIDE-, AND AZIDE-FORMS

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1asq"

Categories: Cucurbita pepo var. melopepo | Large Structures | Huber R | Luecke H | Messerschmidt A

@@ Line 1: / Line 1: @@
-[[Image:1asq.gif|left|200px]]
-<!--
+==X-RAY STRUCTURES AND MECHANISTIC IMPLICATIONS OF THREE FUNCTIONAL DERIVATIVES OF ASCORBATE OXIDASE FROM ZUCCHINI: REDUCED-, PEROXIDE-, AND AZIDE-FORMS==
-The line below this paragraph, containing "STRUCTURE_1asq", creates the "Structure Box" on the page.
+<StructureSection load='1asq' size='340' side='right'caption='[[1asq]], [[Resolution|resolution]] 2.32&Aring;' scene=''>
-You may change the PDB parameter (which sets the PDB file loaded into the applet)
+== Structural highlights ==
-or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
+<table><tr><td colspan='2'>[[1asq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Cucurbita_pepo_var._melopepo Cucurbita pepo var. melopepo]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ASQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ASQ FirstGlance]. <br>
-or leave the SCENE parameter empty for the default display.
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.32&#8491;</td></tr>
--->
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AZI:AZIDE+ION'>AZI</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=OH:HYDROXIDE+ION'>OH</scene></td></tr>
-{{STRUCTURE_1asq|  PDB=1asq  |  SCENE=  }}
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1asq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1asq OCA], [https://pdbe.org/1asq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1asq RCSB], [https://www.ebi.ac.uk/pdbsum/1asq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1asq ProSAT]</span></td></tr>
+</table>
-'''X-RAY STRUCTURES AND MECHANISTIC IMPLICATIONS OF THREE FUNCTIONAL DERIVATIVES OF ASCORBATE OXIDASE FROM ZUCCHINI: REDUCED-, PEROXIDE-, AND AZIDE-FORMS'''
+== Function ==
+[https://www.uniprot.org/uniprot/ASO_CUCPM ASO_CUCPM] May be involved in a redox system involving ascorbic acid.
+== Evolutionary Conservation ==
-==Overview==
+[[Image:Consurf_key_small.gif|200px|right]]
-The X-ray structures of three functional derivatives of ascorbate oxidase (EC 1.10.3.3) from Zucchini have been determined and are compared to the "native" oxidized form. The fully reduced form of ascorbate oxidase has been refined to a crystallographic R-factor of 19.6% for all reflections between 8.0 A and 2.2 A resolution. The geometry at the type-1 copper (CU1) is unchanged compared to the oxidized form, but the oxygen ligand bridging the copper ions CU2 and CU3 (spectroscopic type-3 copper pair) is released and the copper ions move apart yielding a trigonal planar co-ordination with their ligating histidine residues. The co-ordination at the copper ion CU4 (spectroscopic type-2 copper) is not affected. The copper-copper distances increase from an average 3.7 A in the native form to 5.1 A for CU2-CU3, 4.4 A for CU2-CU4 and 4.1 A for CU3-CU4. The peroxide derivative of ascorbate oxidase has been refined to a crystallographic R-factor of 16.0% for all reflections between 8.0 A and 2.59 A resolution. The geometry at the type-1 copper site is not changed compared to the oxidized form. The oxygen ligand bridging copper atoms CU2 and CU3 is lost, too. The peroxide binds terminally to the copper ion CU2 as hydroperoxide. Copper ion CU2 is fourfold co-ordinated to the NE2 atoms of the three histidine residues and to the oxygen atom of the terminally bound peroxide molecule in a distorted tetrahedral geometry. Copper ion CU3 is threefold co-ordinated as in the reduced form and co-ordination around copper atom CU4 is unaltered. The copper-copper distances increase to 4.8 A for CU2-CU3 and 4.5 A for CU2-CU4. The distance CU3-CU4 remains 3.7 A. Treatment with peroxide causes a partial depletion of copper ion CU2. The refinement for the azide derivative of ascorbate oxidase converged at a crystallographic R-factor of 17.8% for all reflections between 8.0 A and 2.32 A. There are no significant structural changes at the type-1 copper site. The oxygen ligand bridging copper ions CU2 and CU3 is again released. Two azide molecules bind terminally to copper ion CU2. Copper ion CU2 is fivefold co-ordinated to the NE2 atoms of the three histidine residues and to both terminally bound azide molecules in a trigonal-bipyramidal manner. Copper-copper distances increase to 5.1 A for CU2-CU3 and 4.6 A for CU2-CU4. The distance CU3-CU4 is decreased to 3.6 A.(ABSTRACT TRUNCATED AT 400 WORDS)
+Check<jmol>
+  <jmolCheckbox>
-==About this Structure==
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/as/1asq_consurf.spt"</scriptWhenChecked>
-ASQ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Cucurbita_pepo_var._melopepo Cucurbita pepo var. melopepo]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ASQ OCA].
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
+    <text>to colour the structure by Evolutionary Conservation</text>
-==Reference==
+  </jmolCheckbox>
-X-ray structures and mechanistic implications of three functional derivatives of ascorbate oxidase from zucchini. Reduced, peroxide and azide forms., Messerschmidt A, Luecke H, Huber R, J Mol Biol. 1993 Apr 5;230(3):997-1014. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8478945 8478945]
+</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=1asq ConSurf].
+<div style="clear:both"></div>
+__TOC__
+</StructureSection>
 [[Category: Cucurbita pepo var. melopepo]]
-[[Category: L-ascorbate oxidase]]
+[[Category: Large Structures]]
-[[Category: Single protein]]
+[[Category: Huber R]]
-[[Category: Huber, R.]]
+[[Category: Luecke H]]
-[[Category: Luecke, H.]]
+[[Category: Messerschmidt A]]
-[[Category: Messerschmidt, A.]]
-[[Category: Oxidoreductase]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 10:39:11 2008''

1asq

From Proteopedia

Current revision

X-RAY STRUCTURES AND MECHANISTIC IMPLICATIONS OF THREE FUNCTIONAL DERIVATIVES OF ASCORBATE OXIDASE FROM ZUCCHINI: REDUCED-, PEROXIDE-, AND AZIDE-FORMS

Structural highlights

Function

Evolutionary Conservation

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox