1sq5

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[[Image:1sq5.jpg|left|200px]]<br /><applet load="1sq5" size="350" color="white" frame="true" align="right" spinBox="true"
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[[Image:1sq5.jpg|left|200px]]
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caption="1sq5, resolution 2.20&Aring;" />
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'''Crystal Structure of E. coli Pantothenate kinase'''<br />
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{{Structure
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|PDB= 1sq5 |SIZE=350|CAPTION= <scene name='initialview01'>1sq5</scene>, resolution 2.20&Aring;
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|SITE=
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|LIGAND= <scene name='pdbligand=PAU:PANTOTHENOIC+ACID'>PAU</scene> and <scene name='pdbligand=ADP:ADENOSINE-5'-DIPHOSPHATE'>ADP</scene>
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|ACTIVITY= [http://en.wikipedia.org/wiki/Pantothenate_kinase Pantothenate kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.33 2.7.1.33]
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|GENE= COAA, RTS, PANK, B3974, C4933, Z5545, ECS4901 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
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}}
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'''Crystal Structure of E. coli Pantothenate kinase'''
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==Overview==
==Overview==
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==About this Structure==
==About this Structure==
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1SQ5 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=PAU:'>PAU</scene> and <scene name='pdbligand=ADP:'>ADP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Pantothenate_kinase Pantothenate kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.33 2.7.1.33] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SQ5 OCA].
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1SQ5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SQ5 OCA].
==Reference==
==Reference==
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The structure of the pantothenate kinase.ADP.pantothenate ternary complex reveals the relationship between the binding sites for substrate, allosteric regulator, and antimetabolites., Ivey RA, Zhang YM, Virga KG, Hevener K, Lee RE, Rock CO, Jackowski S, Park HW, J Biol Chem. 2004 Aug 20;279(34):35622-9. Epub 2004 May 10. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15136582 15136582]
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The structure of the pantothenate kinase.ADP.pantothenate ternary complex reveals the relationship between the binding sites for substrate, allosteric regulator, and antimetabolites., Ivey RA, Zhang YM, Virga KG, Hevener K, Lee RE, Rock CO, Jackowski S, Park HW, J Biol Chem. 2004 Aug 20;279(34):35622-9. Epub 2004 May 10. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15136582 15136582]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Pantothenate kinase]]
[[Category: Pantothenate kinase]]
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[[Category: p-loop]]
[[Category: p-loop]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:04:03 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 14:08:15 2008''

Revision as of 12:08, 20 March 2008

Image:1sq5.jpg


PDB ID 1sq5

Drag the structure with the mouse to rotate
, resolution 2.20Å
Ligands: and
Gene: COAA, RTS, PANK, B3974, C4933, Z5545, ECS4901 (Escherichia coli)
Activity: Pantothenate kinase, with EC number 2.7.1.33
Coordinates: save as pdb, mmCIF, xml



Crystal Structure of E. coli Pantothenate kinase


Overview

Pantothenate kinase catalyzes the first step in the biosynthesis of coenzyme A, the major acyl group carrier in biology. In bacteria, regulation of pantothenate kinase activity is a major factor in controlling intracellular coenzyme A levels, and pantothenate analogs are growth-inhibiting antimetabolites. We have extended the structural information on Escherichia coli pantothenate kinase by determining the structure of the enzyme.ADP. pantothenate ternary complex. Pantothenate binding induces a significant conformational change in amino acids 243-263, which form a "lid" that folds over the open pantothenate binding groove. The positioning of the substrates suggests the reaction proceeds by a concerted mechanism that involves a dissociative transition state, although the negative charge neutralization of the gamma-phosphate by Arg-243, Lys-101, and Mg(2+) coupled with hydrogen bonding of the C1 of pantothenate to Asp-127 suggests different interpretations of the phosphoryl transfer mechanism of pantothenate kinase. N-alkylpantothenamides are substrates for pantothenate kinase. Modeling these antimetabolites into the pantothenate active site predicts that they bind in the same orientation as pantothenate with their alkyl chains interacting with the hydrophobic dome over the pantothenate pocket, which is also accessed by the beta-mercaptoethylamine moiety of the allosteric regulator, coenzyme A. These structural/biochemical studies illustrate the intimate relationship between the substrate, allosteric regulator, and antimetabolite binding sites on pantothenate kinase and provide a framework for studies of its catalysis and feedback regulation.

About this Structure

1SQ5 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

The structure of the pantothenate kinase.ADP.pantothenate ternary complex reveals the relationship between the binding sites for substrate, allosteric regulator, and antimetabolites., Ivey RA, Zhang YM, Virga KG, Hevener K, Lee RE, Rock CO, Jackowski S, Park HW, J Biol Chem. 2004 Aug 20;279(34):35622-9. Epub 2004 May 10. PMID:15136582

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