2gtd
From Proteopedia
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'''Crystal Structure of a Type III Pantothenate Kinase: Insight into the Catalysis of an Essential Coenzyme A Biosynthetic Enzyme Universally Distributed in Bacteria''' | '''Crystal Structure of a Type III Pantothenate Kinase: Insight into the Catalysis of an Essential Coenzyme A Biosynthetic Enzyme Universally Distributed in Bacteria''' | ||
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[[Category: Tomchick, D.]] | [[Category: Tomchick, D.]] | ||
[[Category: Yang, K.]] | [[Category: Yang, K.]] | ||
| - | [[Category: | + | [[Category: Type iii pantothenate kinase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:30:42 2008'' | |
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Revision as of 02:30, 4 May 2008
Crystal Structure of a Type III Pantothenate Kinase: Insight into the Catalysis of an Essential Coenzyme A Biosynthetic Enzyme Universally Distributed in Bacteria
Overview
Pantothenate kinase (PanK) catalyzes the first step in the five-step universal pathway of coenzyme A (CoA) biosynthesis, a key transformation that generally also regulates the intracellular concentration of CoA through feedback inhibition. A novel PanK protein encoded by the gene coaX was recently identified that is distinct from the previously characterized type I PanK (exemplified by the Escherichia coli coaA-encoded PanK protein) and type II eukaryotic PanKs and is not inhibited by CoA or its thioesters. This type III PanK, or PanK-III, is widely distributed in the bacterial kingdom and accounts for the only known PanK in many pathogenic species, such as Helicobacter pylori, Bordetella pertussis, and Pseudomonas aeruginosa. Here we report the first crystal structure of a type III PanK, the enzyme from Thermotoga maritima (PanK(Tm)), solved at 2.0-A resolution. The structure of PanK(Tm) reveals that type III PanKs belong to the acetate and sugar kinase/heat shock protein 70/actin (ASKHA) protein superfamily and that they retain the highly conserved active site motifs common to all members of this superfamily. Comparative structural analysis of the PanK(Tm) active site configuration and mutagenesis of three highly conserved active site aspartates identify these residues as critical for PanK-III catalysis. Furthermore, the analysis also provides an explanation for the lack of CoA feedback inhibition by the enzyme. Since PanK-III adopts a different structural fold from that of the E. coli PanK -- which is a member of the "P-loop kinase"superfamily -- this finding represents yet another example of convergent evolution of the same biological function from a different protein ancestor.
About this Structure
2GTD is a Single protein structure of sequence from Thermotoga maritima. Full crystallographic information is available from OCA.
Reference
Crystal structure of a type III pantothenate kinase: insight into the mechanism of an essential coenzyme A biosynthetic enzyme universally distributed in bacteria., Yang K, Eyobo Y, Brand LA, Martynowski D, Tomchick D, Strauss E, Zhang H, J Bacteriol. 2006 Aug;188(15):5532-40. PMID:16855243 Page seeded by OCA on Sun May 4 05:30:42 2008
