1nyt
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:1nyt.jpg|left|200px]] | [[Image:1nyt.jpg|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_1nyt", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | + | or leave the SCENE parameter empty for the default display. | |
| - | | | + | --> |
| - | | | + | {{STRUCTURE_1nyt| PDB=1nyt | SCENE= }} |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''SHIKIMATE DEHYDROGENASE AroE COMPLEXED WITH NADP+''' | '''SHIKIMATE DEHYDROGENASE AroE COMPLEXED WITH NADP+''' | ||
| Line 28: | Line 25: | ||
[[Category: Lapthorn, A J.]] | [[Category: Lapthorn, A J.]] | ||
[[Category: Roszak, A W.]] | [[Category: Roszak, A W.]] | ||
| - | [[Category: | + | [[Category: Alpha/beta domain]] |
| - | [[Category: | + | [[Category: Wide cleft separation]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:09:09 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 00:09, 3 May 2008
SHIKIMATE DEHYDROGENASE AroE COMPLEXED WITH NADP+
Overview
Shikimate dehydrogenase catalyzes the fourth step of the shikimate pathway, the essential route for the biosynthesis of aromatic compounds in plants and microorganisms. Absent in metazoans, this pathway is an attractive target for nontoxic herbicides and drugs. Escherichia coli expresses two shikimate dehydrogenase paralogs, the NADP-specific AroE and a putative enzyme YdiB. Here we characterize YdiB as a dual specificity quinate/shikimate dehydrogenase that utilizes either NAD or NADP as a cofactor. Structures of AroE and YdiB with bound cofactors were determined at 1.5 and 2.5 A resolution, respectively. Both enzymes display a similar architecture with two alpha/beta domains separated by a wide cleft. Comparison of their dinucleotide-binding domains reveals the molecular basis for cofactor specificity. Independent molecules display conformational flexibility suggesting that a switch between open and closed conformations occurs upon substrate binding. Sequence analysis and structural comparison led us to propose the catalytic machinery and a model for 3-dehydroshikimate recognition. Furthermore, we discuss the evolutionary and metabolic implications of the presence of two shikimate dehydrogenases in E. coli and other organisms.
About this Structure
1NYT is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Structures of shikimate dehydrogenase AroE and its Paralog YdiB. A common structural framework for different activities., Michel G, Roszak AW, Sauve V, Maclean J, Matte A, Coggins JR, Cygler M, Lapthorn AJ, J Biol Chem. 2003 May 23;278(21):19463-72. Epub 2003 Mar 12. PMID:12637497 Page seeded by OCA on Sat May 3 03:09:09 2008
