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< | ==Structure of a Cell Wall Invertase Inhibitor from Tobacco in Complex with Cd2+== | ||
<StructureSection load='1rj4' size='340' side='right'caption='[[1rj4]], [[Resolution|resolution]] 2.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1rj4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Nicotiana_tabacum Nicotiana tabacum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RJ4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1RJ4 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]] 2Å</td></tr> | |||
--> | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BTB:2-[BIS-(2-HYDROXY-ETHYL)-AMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>BTB</scene>, <scene name='pdbligand=CD:CADMIUM+ION'>CD</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=1rj4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rj4 OCA], [https://pdbe.org/1rj4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1rj4 RCSB], [https://www.ebi.ac.uk/pdbsum/1rj4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1rj4 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/O49908_TOBAC O49908_TOBAC] | |||
== 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/rj/1rj4_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1rj4 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Plant invertases are sucrolytic enzymes essential for plant metabolism and development. Enzyme activity is regulated on a posttranslational level via inhibitory proteins, referred to as invertase inhibitors. Ectopic expression of invertase inhibitors in crop plants has high biotechnological potential. However, little biochemical and up to now no detailed structural information is available about this class of plant regulatory proteins. Here, we present the crystal structure of the cell wall-associated invertase inhibitor Nt-CIF from tobacco at a resolution of 1.87A. The structural model reveals an asymmetric four-helix bundle with an uncommon N-terminal extension that appears to be critical for the structural integrity of the protein. Structure analysis of a second crystal form grown in the presence of CdCl(2) reveals two metal binding sites. Nt-CIF is highly thermostable and retains full inhibitory activity after cooling to ambient temperatures. The structure of Nt-CIF provides the first three-dimensional information source for the posttranslational regulation of plant invertases. Based on the recently discovered sequence homology between inhibitors of invertases and pectin methylesterases, our structural model is likely to represent a scaffold also used for the regulation of the latter enzymes, which do not share sequence similarity with invertases. Thus, our structural model sets the 3D-stage for the investigation of posttranslational regulation of invertases as well as pectin methylesterases. | Plant invertases are sucrolytic enzymes essential for plant metabolism and development. Enzyme activity is regulated on a posttranslational level via inhibitory proteins, referred to as invertase inhibitors. Ectopic expression of invertase inhibitors in crop plants has high biotechnological potential. However, little biochemical and up to now no detailed structural information is available about this class of plant regulatory proteins. Here, we present the crystal structure of the cell wall-associated invertase inhibitor Nt-CIF from tobacco at a resolution of 1.87A. The structural model reveals an asymmetric four-helix bundle with an uncommon N-terminal extension that appears to be critical for the structural integrity of the protein. Structure analysis of a second crystal form grown in the presence of CdCl(2) reveals two metal binding sites. Nt-CIF is highly thermostable and retains full inhibitory activity after cooling to ambient temperatures. The structure of Nt-CIF provides the first three-dimensional information source for the posttranslational regulation of plant invertases. Based on the recently discovered sequence homology between inhibitors of invertases and pectin methylesterases, our structural model is likely to represent a scaffold also used for the regulation of the latter enzymes, which do not share sequence similarity with invertases. Thus, our structural model sets the 3D-stage for the investigation of posttranslational regulation of invertases as well as pectin methylesterases. | ||
The invertase inhibitor Nt-CIF from tobacco: a highly thermostable four-helix bundle with an unusual N-terminal extension.,Hothorn M, D'Angelo I, Marquez JA, Greiner S, Scheffzek K J Mol Biol. 2004 Jan 23;335(4):987-95. PMID:14698293<ref>PMID:14698293</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1rj4" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Nicotiana tabacum]] | [[Category: Nicotiana tabacum]] | ||
[[Category: | [[Category: D'Angelo I]] | ||
[[Category: Greiner S]] | |||
[[Category: Greiner | [[Category: Hothorn M]] | ||
[[Category: Hothorn | [[Category: Marquez JA]] | ||
[[Category: Marquez | [[Category: Scheffzek K]] | ||
[[Category: Scheffzek | |||
Latest revision as of 10:36, 23 October 2024
Structure of a Cell Wall Invertase Inhibitor from Tobacco in Complex with Cd2+Structure of a Cell Wall Invertase Inhibitor from Tobacco in Complex with Cd2+
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPlant invertases are sucrolytic enzymes essential for plant metabolism and development. Enzyme activity is regulated on a posttranslational level via inhibitory proteins, referred to as invertase inhibitors. Ectopic expression of invertase inhibitors in crop plants has high biotechnological potential. However, little biochemical and up to now no detailed structural information is available about this class of plant regulatory proteins. Here, we present the crystal structure of the cell wall-associated invertase inhibitor Nt-CIF from tobacco at a resolution of 1.87A. The structural model reveals an asymmetric four-helix bundle with an uncommon N-terminal extension that appears to be critical for the structural integrity of the protein. Structure analysis of a second crystal form grown in the presence of CdCl(2) reveals two metal binding sites. Nt-CIF is highly thermostable and retains full inhibitory activity after cooling to ambient temperatures. The structure of Nt-CIF provides the first three-dimensional information source for the posttranslational regulation of plant invertases. Based on the recently discovered sequence homology between inhibitors of invertases and pectin methylesterases, our structural model is likely to represent a scaffold also used for the regulation of the latter enzymes, which do not share sequence similarity with invertases. Thus, our structural model sets the 3D-stage for the investigation of posttranslational regulation of invertases as well as pectin methylesterases. The invertase inhibitor Nt-CIF from tobacco: a highly thermostable four-helix bundle with an unusual N-terminal extension.,Hothorn M, D'Angelo I, Marquez JA, Greiner S, Scheffzek K J Mol Biol. 2004 Jan 23;335(4):987-95. PMID:14698293[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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