1fj2
From Proteopedia
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|PDB= 1fj2 |SIZE=350|CAPTION= <scene name='initialview01'>1fj2</scene>, resolution 1.5Å | |PDB= 1fj2 |SIZE=350|CAPTION= <scene name='initialview01'>1fj2</scene>, resolution 1.5Å | ||
|SITE= <scene name='pdbsite=ACA:Active+Site+In+Chain+A'>ACA</scene> and <scene name='pdbsite=ACB:Active+Site+In+Chain+B'>ACB</scene> | |SITE= <scene name='pdbsite=ACA:Active+Site+In+Chain+A'>ACA</scene> and <scene name='pdbsite=ACB:Active+Site+In+Chain+B'>ACB</scene> | ||
| - | |LIGAND= <scene name='pdbligand=BR:BROMIDE ION'>BR</scene> | + | |LIGAND= <scene name='pdbligand=BR:BROMIDE+ION'>BR</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Alkylglycerophosphoethanolamine_phosphodiesterase Alkylglycerophosphoethanolamine phosphodiesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.4.39 3.1.4.39] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Alkylglycerophosphoethanolamine_phosphodiesterase Alkylglycerophosphoethanolamine phosphodiesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.4.39 3.1.4.39] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1auo|1auo]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1fj2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fj2 OCA], [http://www.ebi.ac.uk/pdbsum/1fj2 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1fj2 RCSB]</span> | ||
}} | }} | ||
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==Overview== | ==Overview== | ||
BACKGROUND: Many proteins undergo posttranslational modifications involving covalent attachment of lipid groups. Among them is palmitoylation, a dynamic, reversible process that affects trimeric G proteins and Ras and constitutes a regulatory mechanism for signal transduction pathways. Recently, an acylhydrolase previously identified as lysophospholipase has been shown to function as an acyl protein thioesterase, which catalyzes depalmitoylation of Galpha proteins as well as Ras. Its amino acid sequence suggested that the protein is evolutionarily related to neutral lipases and other thioesterases, but direct structural information was not available. RESULTS: We have solved the crystal structure of the human putative Galpha-regulatory protein acyl thioesterase (hAPT1) with a single data set collected from a crystal containing the wild-type protein. The phases were calculated to 1.8 A resolution based on anomalous scattering from Br(-) ions introduced in the cryoprotectant solution in which the crystal was soaked for 20 s. The model was refined against data extending to a resolution of 1.5 A to an R factor of 18.6%. The enzyme is a member of the ubiquitous alpha/beta hydrolase family, which includes other acylhydrolases such as the palmitoyl protein thioesterase (PPT1). CONCLUSIONS: The human APT1 is closely related to a previously described carboxylesterase from Pseudomonas fluorescens. The active site contains a catalytic triad of Ser-114, His-203, and Asp-169. Like carboxylesterase, hAPT1 appears to be dimeric, although the mutual disposition of molecules in the two dimers differs. Unlike carboxylesterase, the substrate binding pocket and the active site of hAPT1 are occluded by the dimer interface, suggesting that the enzyme must dissociate upon interaction with substrate. | BACKGROUND: Many proteins undergo posttranslational modifications involving covalent attachment of lipid groups. Among them is palmitoylation, a dynamic, reversible process that affects trimeric G proteins and Ras and constitutes a regulatory mechanism for signal transduction pathways. Recently, an acylhydrolase previously identified as lysophospholipase has been shown to function as an acyl protein thioesterase, which catalyzes depalmitoylation of Galpha proteins as well as Ras. Its amino acid sequence suggested that the protein is evolutionarily related to neutral lipases and other thioesterases, but direct structural information was not available. RESULTS: We have solved the crystal structure of the human putative Galpha-regulatory protein acyl thioesterase (hAPT1) with a single data set collected from a crystal containing the wild-type protein. The phases were calculated to 1.8 A resolution based on anomalous scattering from Br(-) ions introduced in the cryoprotectant solution in which the crystal was soaked for 20 s. The model was refined against data extending to a resolution of 1.5 A to an R factor of 18.6%. The enzyme is a member of the ubiquitous alpha/beta hydrolase family, which includes other acylhydrolases such as the palmitoyl protein thioesterase (PPT1). CONCLUSIONS: The human APT1 is closely related to a previously described carboxylesterase from Pseudomonas fluorescens. The active site contains a catalytic triad of Ser-114, His-203, and Asp-169. Like carboxylesterase, hAPT1 appears to be dimeric, although the mutual disposition of molecules in the two dimers differs. Unlike carboxylesterase, the substrate binding pocket and the active site of hAPT1 are occluded by the dimer interface, suggesting that the enzyme must dissociate upon interaction with substrate. | ||
| - | |||
| - | ==Disease== | ||
| - | Known diseases associated with this structure: Autoimmune lymphoproliferative syndrome OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=134637 134637]], Autoimmune lymphoproliferative syndrome, type IA OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=134637 134637]], Squamous cell carcinoma, burn scar-related, somatic OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=134637 134637]] | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Jones, T.]] | [[Category: Jones, T.]] | ||
[[Category: Kuznetsov, S.]] | [[Category: Kuznetsov, S.]] | ||
| - | [[Category: BR]] | ||
[[Category: alpha/beta hydrolase]] | [[Category: alpha/beta hydrolase]] | ||
[[Category: anomalous diffraction]] | [[Category: anomalous diffraction]] | ||
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[[Category: serine hydrolase]] | [[Category: serine hydrolase]] | ||
| - | ''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 20:23:55 2008'' |
Revision as of 17:23, 30 March 2008
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| , resolution 1.5Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | and | ||||||
| Ligands: | |||||||
| Activity: | Alkylglycerophosphoethanolamine phosphodiesterase, with EC number 3.1.4.39 | ||||||
| Related: | 1auo
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of the human acyl protein thioesterase 1 at 1.5 A resolution
Overview
BACKGROUND: Many proteins undergo posttranslational modifications involving covalent attachment of lipid groups. Among them is palmitoylation, a dynamic, reversible process that affects trimeric G proteins and Ras and constitutes a regulatory mechanism for signal transduction pathways. Recently, an acylhydrolase previously identified as lysophospholipase has been shown to function as an acyl protein thioesterase, which catalyzes depalmitoylation of Galpha proteins as well as Ras. Its amino acid sequence suggested that the protein is evolutionarily related to neutral lipases and other thioesterases, but direct structural information was not available. RESULTS: We have solved the crystal structure of the human putative Galpha-regulatory protein acyl thioesterase (hAPT1) with a single data set collected from a crystal containing the wild-type protein. The phases were calculated to 1.8 A resolution based on anomalous scattering from Br(-) ions introduced in the cryoprotectant solution in which the crystal was soaked for 20 s. The model was refined against data extending to a resolution of 1.5 A to an R factor of 18.6%. The enzyme is a member of the ubiquitous alpha/beta hydrolase family, which includes other acylhydrolases such as the palmitoyl protein thioesterase (PPT1). CONCLUSIONS: The human APT1 is closely related to a previously described carboxylesterase from Pseudomonas fluorescens. The active site contains a catalytic triad of Ser-114, His-203, and Asp-169. Like carboxylesterase, hAPT1 appears to be dimeric, although the mutual disposition of molecules in the two dimers differs. Unlike carboxylesterase, the substrate binding pocket and the active site of hAPT1 are occluded by the dimer interface, suggesting that the enzyme must dissociate upon interaction with substrate.
About this Structure
1FJ2 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of the human acyl protein thioesterase I from a single X-ray data set to 1.5 A., Devedjiev Y, Dauter Z, Kuznetsov SR, Jones TL, Derewenda ZS, Structure. 2000 Nov 15;8(11):1137-46. PMID:11080636
Page seeded by OCA on Sun Mar 30 20:23:55 2008
