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[[Image:1qlm.jpg|left|200px]]


{{Structure
==The crystal structure of methenyltetrahydromethanopterin cyclohydrolase from the hyperthermophilic archaeon Methanopyrus kandleri==
|PDB= 1qlm |SIZE=350|CAPTION= <scene name='initialview01'>1qlm</scene>, resolution 2.00&Aring;
<StructureSection load='1qlm' size='340' side='right'caption='[[1qlm]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>
<table><tr><td colspan='2'>[[1qlm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Methanopyrus_kandleri Methanopyrus kandleri]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QLM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QLM FirstGlance]. <br>
|ACTIVITY=  
</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&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qlm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qlm OCA], [https://pdbe.org/1qlm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qlm RCSB], [https://www.ebi.ac.uk/pdbsum/1qlm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qlm ProSAT]</span></td></tr>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qlm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qlm OCA], [http://www.ebi.ac.uk/pdbsum/1qlm PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qlm RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/MCH_METKA MCH_METKA] Catalyzes the reversible interconversion of 5-formyl-H(4)MPT to methenyl-H(4)MPT(+).
== 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/ql/1qlm_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=1qlm ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: The reduction of carbon dioxide to methane in methanogenic archaea involves the tetrahydrofolate analogue tetrahydromethanopterin (H(4)MPT) as a C(1) unit carrier. In the third step of this reaction sequence, N(5)-formyl-H(4)MPT is converted to methenyl-H(4)MPT(+) by the enzyme methenyltetrahydromethanopterin cyclohydrolase. The cyclohydrolase from the hyperthermophilic archaeon Methanopyrus kandleri (Mch) is extremely thermostable and adapted to a high intracellular concentration of lyotropic salts. RESULTS: Mch was crystallized and its structure solved at 2.0 A resolution using a combination of the single isomorphous replacement (SIR) and multiple anomalous dispersion (MAD) techniques. The structure of the homotrimeric enzyme reveals a new alpha/beta fold that is composed of two domains forming a large sequence-conserved pocket between them. Two phosphate ions were found in and adjacent to this pocket, respectively; the latter is displaced by the phosphate moiety of the substrate formyl-H(4)MPT according to a hypothetical model of the substrate binding. CONCLUSIONS: Although the exact position of the substrate is not yet known, the residues lining the active site of Mch could be tentatively assigned. Comparison of Mch with the tetrahydrofolate-specific cyclohydrolase/dehydrogenase reveals similarities in domain arrangement and in some active-site residues, whereas the fold appears to be different. The adaptation of Mch to high salt concentrations and high temperatures is reflected by the excess of acidic residues at the trimer surface and by the higher oligomerization state of Mch compared with its mesophtic counterparts.


'''THE CRYSTAL STRUCTURE OF METHENYLTETRAHYDROMETHANOPTERIN CYCLOHYDROLASE FROM THE HYPERTHERMOPHILIC ARCHAEON METHANOPYRUS KANDLERI'''
The crystal structure of methenyltetrahydromethanopterin cyclohydrolase from the hyperthermophilic archaeon Methanopyrus kandleri.,Grabarse W, Vaupel M, Vorholt JA, Shima S, Thauer RK, Wittershagen A, Bourenkov G, Bartunik HD, Ermler U Structure. 1999 Oct 15;7(10):1257-68. PMID:10545331<ref>PMID:10545331</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1qlm" style="background-color:#fffaf0;"></div>


==Overview==
==See Also==
BACKGROUND: The reduction of carbon dioxide to methane in methanogenic archaea involves the tetrahydrofolate analogue tetrahydromethanopterin (H(4)MPT) as a C(1) unit carrier. In the third step of this reaction sequence, N(5)-formyl-H(4)MPT is converted to methenyl-H(4)MPT(+) by the enzyme methenyltetrahydromethanopterin cyclohydrolase. The cyclohydrolase from the hyperthermophilic archaeon Methanopyrus kandleri (Mch) is extremely thermostable and adapted to a high intracellular concentration of lyotropic salts. RESULTS: Mch was crystallized and its structure solved at 2.0 A resolution using a combination of the single isomorphous replacement (SIR) and multiple anomalous dispersion (MAD) techniques. The structure of the homotrimeric enzyme reveals a new alpha/beta fold that is composed of two domains forming a large sequence-conserved pocket between them. Two phosphate ions were found in and adjacent to this pocket, respectively; the latter is displaced by the phosphate moiety of the substrate formyl-H(4)MPT according to a hypothetical model of the substrate binding. CONCLUSIONS: Although the exact position of the substrate is not yet known, the residues lining the active site of Mch could be tentatively assigned. Comparison of Mch with the tetrahydrofolate-specific cyclohydrolase/dehydrogenase reveals similarities in domain arrangement and in some active-site residues, whereas the fold appears to be different. The adaptation of Mch to high salt concentrations and high temperatures is reflected by the excess of acidic residues at the trimer surface and by the higher oligomerization state of Mch compared with its mesophtic counterparts.
*[[Cyclohydrolase 3D structures|Cyclohydrolase 3D structures]]
 
== References ==
==About this Structure==
<references/>
1QLM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Methanopyrus_kandleri Methanopyrus kandleri]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QLM OCA].
__TOC__
 
</StructureSection>
==Reference==
[[Category: Large Structures]]
The crystal structure of methenyltetrahydromethanopterin cyclohydrolase from the hyperthermophilic archaeon Methanopyrus kandleri., Grabarse W, Vaupel M, Vorholt JA, Shima S, Thauer RK, Wittershagen A, Bourenkov G, Bartunik HD, Ermler U, Structure. 1999 Oct 15;7(10):1257-68. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10545331 10545331]
[[Category: Methanopyrus kandleri]]
[[Category: Methanopyrus kandleri]]
[[Category: Single protein]]
[[Category: Grabarse W]]
[[Category: Grabarse, W.]]
[[Category: biological methanogenesis]]
[[Category: tetrahydromethanopterin]]
 
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