1n3b
From Proteopedia
(New page: 200px<br /><applet load="1n3b" size="450" color="white" frame="true" align="right" spinBox="true" caption="1n3b, resolution 1.8Å" /> '''Crystal Structure of ...) |
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| - | [[Image:1n3b.gif|left|200px]]<br /><applet load="1n3b" size=" | + | [[Image:1n3b.gif|left|200px]]<br /><applet load="1n3b" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1n3b, resolution 1.8Å" /> | caption="1n3b, resolution 1.8Å" /> | ||
'''Crystal Structure of Dephosphocoenzyme A kinase from Escherichia coli'''<br /> | '''Crystal Structure of Dephosphocoenzyme A kinase from Escherichia coli'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Coenzyme A (CoA) is an essential cofactor used in a wide variety of | + | Coenzyme A (CoA) is an essential cofactor used in a wide variety of biochemical pathways. The final step in the biosynthesis of CoA is catalyzed by dephosphocoenzyme A kinase (DPCK, E.C. 2.7.1.24). Here we report the crystal structure of DPCK from Escherichia coli at 1.8 A resolution. This enzyme forms a tightly packed trimer in its crystal state, in contrast to its observed monomeric structure in solution and to the monomeric, homologous DPCK structure from Haemophilus influenzae. We have confirmed the existence of the trimeric form of the enzyme in solution using gel filtration chromatography measurements. Dephospho-CoA kinase is structurally similar to many nucleoside kinases and other P-loop-containing nucleotide triphosphate hydrolases, despite having negligible sequence similarity to these enzymes. Each monomer consists of five parallel beta-strands flanked by alpha-helices, with an ATP-binding site formed by a P-loop motif. Orthologs of the E. coli DPCK sequence exist in a wide range of organisms, including humans. Multiple alignment of orthologous DPCK sequences reveals a set of highly conserved residues in the vicinity of the nucleotide/CoA binding site. |
==About this Structure== | ==About this Structure== | ||
| - | 1N3B 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 SO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Dephospho-CoA_kinase Dephospho-CoA kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.24 2.7.1.24] Full crystallographic information is available from [http:// | + | 1N3B 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=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Dephospho-CoA_kinase Dephospho-CoA kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.24 2.7.1.24] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N3B OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: BSGI, Montreal-Kingston | + | [[Category: BSGI, Montreal-Kingston Bacterial Structural Genomics Initiative.]] |
| - | [[Category: Barbosa, J | + | [[Category: Barbosa, J A.R G.]] |
[[Category: Cygler, M.]] | [[Category: Cygler, M.]] | ||
[[Category: Hung, L-W.]] | [[Category: Hung, L-W.]] | ||
[[Category: Li, Y.]] | [[Category: Li, Y.]] | ||
[[Category: Matte, A.]] | [[Category: Matte, A.]] | ||
| - | [[Category: Toole, N | + | [[Category: Toole, N O.]] |
[[Category: SO4]] | [[Category: SO4]] | ||
[[Category: alpha/beta]] | [[Category: alpha/beta]] | ||
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[[Category: trimer]] | [[Category: trimer]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:01:55 2008'' |
Revision as of 12:01, 21 February 2008
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Crystal Structure of Dephosphocoenzyme A kinase from Escherichia coli
Overview
Coenzyme A (CoA) is an essential cofactor used in a wide variety of biochemical pathways. The final step in the biosynthesis of CoA is catalyzed by dephosphocoenzyme A kinase (DPCK, E.C. 2.7.1.24). Here we report the crystal structure of DPCK from Escherichia coli at 1.8 A resolution. This enzyme forms a tightly packed trimer in its crystal state, in contrast to its observed monomeric structure in solution and to the monomeric, homologous DPCK structure from Haemophilus influenzae. We have confirmed the existence of the trimeric form of the enzyme in solution using gel filtration chromatography measurements. Dephospho-CoA kinase is structurally similar to many nucleoside kinases and other P-loop-containing nucleotide triphosphate hydrolases, despite having negligible sequence similarity to these enzymes. Each monomer consists of five parallel beta-strands flanked by alpha-helices, with an ATP-binding site formed by a P-loop motif. Orthologs of the E. coli DPCK sequence exist in a wide range of organisms, including humans. Multiple alignment of orthologous DPCK sequences reveals a set of highly conserved residues in the vicinity of the nucleotide/CoA binding site.
About this Structure
1N3B is a Single protein structure of sequence from Escherichia coli with as ligand. Active as Dephospho-CoA kinase, with EC number 2.7.1.24 Full crystallographic information is available from OCA.
Reference
Crystal structure of a trimeric form of dephosphocoenzyme A kinase from Escherichia coli., O'Toole N, Barbosa JA, Li Y, Hung LW, Matte A, Cygler M, Protein Sci. 2003 Feb;12(2):327-36. PMID:12538896
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Categories: Dephospho-CoA kinase | Escherichia coli | Single protein | BSGI, Montreal-Kingston Bacterial Structural Genomics Initiative. | Barbosa, J A.R G. | Cygler, M. | Hung, L-W. | Li, Y. | Matte, A. | Toole, N O. | SO4 | Alpha/beta | Bsgi | Montreal-kingston bacterial structural genomics initiative | P-loop | Structural genomics | Trimer
