1n2l: Difference between revisions
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|PDB= 1n2l |SIZE=350|CAPTION= <scene name='initialview01'>1n2l</scene>, resolution 3.20Å | |PDB= 1n2l |SIZE=350|CAPTION= <scene name='initialview01'>1n2l</scene>, resolution 3.20Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=FGP:2-AMINO-3-HYDROXY-3-PHOSPHONOOXY-PROPIONIC+ACID'>FGP</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Cerebroside-sulfatase Cerebroside-sulfatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.6.8 3.1.6.8] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Cerebroside-sulfatase Cerebroside-sulfatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.6.8 3.1.6.8] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY=[[1n2k|1N2K]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1n2l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1n2l OCA], [http://www.ebi.ac.uk/pdbsum/1n2l PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1n2l RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The structures of human arylsulfatase A crystals soaked in solutions containing 4-methylumbelliferyl phosphate and O-phospho-DL-tyrosine have been determined at 2.7- and 3.2-A resolution, respectively. The formylglycine in position 69, a residue crucial for catalytic activity, was unambiguously identified in both structures as forming a covalent bond to the phosphate moiety. A hydroxyl group is present at the Cbeta of residue 69 and the formation of one out of two possible stereomeric forms is strongly favoured. The structures confirm the importance of the gem-diol intermediate in the arylsulfatase's catalytic mechanism. The presence of an apparently stable covalent bond is consistent with the weak phosphatase activity observed for human arylsulfatase A. The structures of the complexes suggest that phosphate ions and phosphate esters inhibit arylsulfatase in non-covalent and covalent modes, respectively. The metal ion present in the active site of arylsulfatase A isolated from human placenta is Ca(2+) and not Mg(2+) as was found in the structure of the recombinant enzyme. | The structures of human arylsulfatase A crystals soaked in solutions containing 4-methylumbelliferyl phosphate and O-phospho-DL-tyrosine have been determined at 2.7- and 3.2-A resolution, respectively. The formylglycine in position 69, a residue crucial for catalytic activity, was unambiguously identified in both structures as forming a covalent bond to the phosphate moiety. A hydroxyl group is present at the Cbeta of residue 69 and the formation of one out of two possible stereomeric forms is strongly favoured. The structures confirm the importance of the gem-diol intermediate in the arylsulfatase's catalytic mechanism. The presence of an apparently stable covalent bond is consistent with the weak phosphatase activity observed for human arylsulfatase A. The structures of the complexes suggest that phosphate ions and phosphate esters inhibit arylsulfatase in non-covalent and covalent modes, respectively. The metal ion present in the active site of arylsulfatase A isolated from human placenta is Ca(2+) and not Mg(2+) as was found in the structure of the recombinant enzyme. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Monkiewicz, M.]] | [[Category: Monkiewicz, M.]] | ||
[[Category: Ortlund, E.]] | [[Category: Ortlund, E.]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: inhibition]] | [[Category: inhibition]] | ||
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[[Category: phosphate ester hydrolysis]] | [[Category: phosphate ester hydrolysis]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:24:30 2008'' | ||