1nrx: Difference between revisions
New page: left|200px<br /><applet load="1nrx" size="450" color="white" frame="true" align="right" spinBox="true" caption="1nrx, resolution 2.90Å" /> '''Crystal structure of... |
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[[Image:1nrx.jpg|left|200px]]<br /><applet load="1nrx" size=" | [[Image:1nrx.jpg|left|200px]]<br /><applet load="1nrx" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1nrx, resolution 2.90Å" /> | caption="1nrx, resolution 2.90Å" /> | ||
'''Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD'''<br /> | '''Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD'''<br /> | ||
==Overview== | ==Overview== | ||
In order to investigate systematically substrate and cofactor-induced | In order to investigate systematically substrate and cofactor-induced conformational changes in the enzyme dehydroquinate synthase (DHQS), eight structures representing a series of differently liganded states have been determined in a total of six crystal forms. DHQS in the absence of the substrate analogue carbaphosphonate, either unliganded or in the presence of NAD or ADP, is in an open form where a relative rotation of 11-13 degrees between N and C-terminal domains occurs.Analysis of torsion angle difference plots between sets of structures reveals eight rearrangements that appear relevant to domain closure and a further six related to crystal packing. Overlapping 21 different copies of the individual N and C-terminal DHQS domains further reveals a series of pivot points about which these movements occur and illustrates the way in which widely separated secondary structure elements are mechanically inter-linked to form "composite elements", which propagate structural changes across large distances.This analysis has provided insight into the basis of DHQS ligand-initiated domain closure and gives rise to the proposal of an ordered sequence of events involving substrate binding, and local rearrangements within the active site that are propagated to the hinge regions, leading to closure of the active-site cleft. | ||
==About this Structure== | ==About this Structure== | ||
1NRX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Emericella_nidulans Emericella nidulans] with ZN, CL and NAD as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/3-dehydroquinate_synthase 3-dehydroquinate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.4 4.2.3.4] Full crystallographic information is available from [http:// | 1NRX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Emericella_nidulans Emericella nidulans] with <scene name='pdbligand=ZN:'>ZN</scene>, <scene name='pdbligand=CL:'>CL</scene> and <scene name='pdbligand=NAD:'>NAD</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/3-dehydroquinate_synthase 3-dehydroquinate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.4 4.2.3.4] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NRX OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Emericella nidulans]] | [[Category: Emericella nidulans]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Hawkins, A | [[Category: Hawkins, A R.]] | ||
[[Category: Lamb, H | [[Category: Lamb, H K.]] | ||
[[Category: Nichols, C | [[Category: Nichols, C E.]] | ||
[[Category: Ren, J.]] | [[Category: Ren, J.]] | ||
[[Category: Stammers, D | [[Category: Stammers, D K.]] | ||
[[Category: CL]] | [[Category: CL]] | ||
[[Category: NAD]] | [[Category: NAD]] | ||
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[[Category: shikimate pathway]] | [[Category: shikimate pathway]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:09:33 2008'' | ||
Revision as of 15:09, 21 February 2008
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Crystal structure of 3-dehydroquinate synthase (DHQS) in complex with ZN2+ and NAD
OverviewOverview
In order to investigate systematically substrate and cofactor-induced conformational changes in the enzyme dehydroquinate synthase (DHQS), eight structures representing a series of differently liganded states have been determined in a total of six crystal forms. DHQS in the absence of the substrate analogue carbaphosphonate, either unliganded or in the presence of NAD or ADP, is in an open form where a relative rotation of 11-13 degrees between N and C-terminal domains occurs.Analysis of torsion angle difference plots between sets of structures reveals eight rearrangements that appear relevant to domain closure and a further six related to crystal packing. Overlapping 21 different copies of the individual N and C-terminal DHQS domains further reveals a series of pivot points about which these movements occur and illustrates the way in which widely separated secondary structure elements are mechanically inter-linked to form "composite elements", which propagate structural changes across large distances.This analysis has provided insight into the basis of DHQS ligand-initiated domain closure and gives rise to the proposal of an ordered sequence of events involving substrate binding, and local rearrangements within the active site that are propagated to the hinge regions, leading to closure of the active-site cleft.
About this StructureAbout this Structure
1NRX is a Single protein structure of sequence from Emericella nidulans with , and as ligands. Active as 3-dehydroquinate synthase, with EC number 4.2.3.4 Full crystallographic information is available from OCA.
ReferenceReference
Ligand-induced conformational changes and a mechanism for domain closure in Aspergillus nidulans dehydroquinate synthase., Nichols CE, Ren J, Lamb HK, Hawkins AR, Stammers DK, J Mol Biol. 2003 Mar 14;327(1):129-44. PMID:12614613
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