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2ib7
From Proteopedia
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| - | [[Image:2ib7.jpg|left|200px]] | + | [[Image:2ib7.jpg|left|200px]] |
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| - | '''Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase (T2): the importance of potassium and chloride for its structure and function''' | + | {{Structure |
| + | |PDB= 2ib7 |SIZE=350|CAPTION= <scene name='initialview01'>2ib7</scene>, resolution 2.05Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</scene> and <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Acetyl-CoA_C-acetyltransferase Acetyl-CoA C-acetyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.9 2.3.1.9] | ||
| + | |GENE= ACAT1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]) | ||
| + | }} | ||
| + | |||
| + | '''Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase (T2): the importance of potassium and chloride for its structure and function''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2IB7 is a [ | + | 2IB7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IB7 OCA]. |
==Reference== | ==Reference== | ||
| - | Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase: the importance of potassium and chloride ions for its structure and function., Haapalainen AM, Merilainen G, Pirila PL, Kondo N, Fukao T, Wierenga RK, Biochemistry. 2007 Apr 10;46(14):4305-21. Epub 2007 Mar 20. PMID:[http:// | + | Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase: the importance of potassium and chloride ions for its structure and function., Haapalainen AM, Merilainen G, Pirila PL, Kondo N, Fukao T, Wierenga RK, Biochemistry. 2007 Apr 10;46(14):4305-21. Epub 2007 Mar 20. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17371050 17371050] |
[[Category: Acetyl-CoA C-acetyltransferase]] | [[Category: Acetyl-CoA C-acetyltransferase]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
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[[Category: thiolase fold]] | [[Category: thiolase fold]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 17:27:25 2008'' |
Revision as of 15:27, 20 March 2008
| |||||||
| , resolution 2.05Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Gene: | ACAT1 (Homo sapiens) | ||||||
| Activity: | Acetyl-CoA C-acetyltransferase, with EC number 2.3.1.9 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase (T2): the importance of potassium and chloride for its structure and function
Contents |
Overview
Thiolases are CoA-dependent enzymes which catalyze the formation of a carbon-carbon bond in a Claisen condensation step and its reverse reaction via a thiolytic degradation mechanism. Mitochondrial acetoacetyl-coenzyme A (CoA) thiolase (T2) is important in the pathways for the synthesis and degradation of ketone bodies as well as for the degradation of 2-methylacetoacetyl-CoA. Human T2 deficiency has been identified in more than 60 patients. A unique property of T2 is its activation by potassium ions. High-resolution human T2 crystal structures are reported for the apo form and the CoA complex, with and without a bound potassium ion. The potassium ion is bound near the CoA binding site and the catalytic site. Binding of the potassium ion at this low-affinity binding site causes the rigidification of a CoA binding loop and an active site loop. Unexpectedly, a high-affinity binding site for a chloride ion has also been identified. The chloride ion is copurified, and its binding site is at the dimer interface, near two catalytic loops. A unique property of T2 is its ability to use 2-methyl-branched acetoacetyl-CoA as a substrate, whereas the other structurally characterized thiolases cannot utilize the 2-methylated compounds. The kinetic measurements show that T2 can degrade acetoacetyl-CoA and 2-methylacetoacetyl-CoA with similar catalytic efficiencies. For both substrates, the turnover numbers increase approximately 3-fold when the potassium ion concentration is increased from 0 to 40 mM KCl. The structural analysis of the active site of T2 indicates that the Phe325-Pro326 dipeptide near the catalytic cavity is responsible for the exclusive 2-methyl-branched substrate specificity.
Disease
Known diseases associated with this structure: Alpha-methylacetoacetic aciduria OMIM:[607809], Hypermethioninemia, persistent, autosomal dominant, due to methionine adenosyltransferase I/III deficiency OMIM:[250850], Methionine adenosyltransferase deficiency, autosomal recessive OMIM:[250850]
About this Structure
2IB7 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystallographic and kinetic studies of human mitochondrial acetoacetyl-CoA thiolase: the importance of potassium and chloride ions for its structure and function., Haapalainen AM, Merilainen G, Pirila PL, Kondo N, Fukao T, Wierenga RK, Biochemistry. 2007 Apr 10;46(14):4305-21. Epub 2007 Mar 20. PMID:17371050
Page seeded by OCA on Thu Mar 20 17:27:25 2008
