1lg5
From Proteopedia
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| - | [[Image:1lg5.jpg|left|200px]] | + | [[Image:1lg5.jpg|left|200px]] |
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| - | '''Crystal Structure Analysis of the HCA II Mutant T199P in complex with beta-mercaptoethanol''' | + | {{Structure |
| + | |PDB= 1lg5 |SIZE=350|CAPTION= <scene name='initialview01'>1lg5</scene>, resolution 1.75Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Carbonate_dehydratase Carbonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.1 4.2.1.1] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''Crystal Structure Analysis of the HCA II Mutant T199P in complex with beta-mercaptoethanol''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1LG5 is a [ | + | 1LG5 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=1LG5 OCA]. |
==Reference== | ==Reference== | ||
| - | Organization of an efficient carbonic anhydrase: implications for the mechanism based on structure-function studies of a T199P/C206S mutant., Huang S, Sjoblom B, Sauer-Eriksson AE, Jonsson BH, Biochemistry. 2002 Jun 18;41(24):7628-35. PMID:[http:// | + | Organization of an efficient carbonic anhydrase: implications for the mechanism based on structure-function studies of a T199P/C206S mutant., Huang S, Sjoblom B, Sauer-Eriksson AE, Jonsson BH, Biochemistry. 2002 Jun 18;41(24):7628-35. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12056894 12056894] |
[[Category: Carbonate dehydratase]] | [[Category: Carbonate dehydratase]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
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[[Category: hcaii mutant t199p-bme complex]] | [[Category: hcaii mutant t199p-bme complex]] | ||
| - | ''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 12:30:30 2008'' |
Revision as of 10:30, 20 March 2008
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| , resolution 1.75Å | |||||||
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| Ligands: | and | ||||||
| Activity: | Carbonate dehydratase, with EC number 4.2.1.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal Structure Analysis of the HCA II Mutant T199P in complex with beta-mercaptoethanol
Contents |
Overview
Substitution of Pro for Thr199 in the active site of human carbonic anhydrase II (HCA II)(1) reduces its catalytic efficiency about 3000-fold. X-ray crystallographic structures of the T199P/C206S variant have been determined in complex with the substrate bicarbonate and with the inhibitors thiocyanate and beta-mercaptoethanol. The latter molecule is normally not an inhibitor of wild-type HCA II. All three ligands display novel binding interactions to the T199P/C206S mutant. The beta-mercaptoethanol molecule binds in the active site area with its sulfur atom tetrahedrally coordinated to the zinc ion. Thiocyanate binds tetrahedrally coordinated to the zinc ion in T199P/C206S, in contrast to its pentacoordinated binding to the zinc ion in wild-type HCA II. Bicarbonate binds to the mutant with two of its oxygens at the positions of the zinc water (Wat263) and Wat318 in wild-type HCA II. The environment of this area is more hydrophilic than the normal bicarbonate-binding site of HCA II situated in the hydrophobic part of the cavity normally occupied by the so-called deep water (Wat338). The observation of a new binding site for bicarbonate has implications for understanding the mechanism by which the main-chain amino group of Thr199 acquired an important role for orientation of the substrate during the evolution of the enzyme.
Disease
Known disease associated with this structure: Osteopetrosis, autosomal recessive 3, with renal tubular acidosis OMIM:[611492]
About this Structure
1LG5 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Organization of an efficient carbonic anhydrase: implications for the mechanism based on structure-function studies of a T199P/C206S mutant., Huang S, Sjoblom B, Sauer-Eriksson AE, Jonsson BH, Biochemistry. 2002 Jun 18;41(24):7628-35. PMID:12056894
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