1nt4
From Proteopedia
(New page: 200px<br /><applet load="1nt4" size="450" color="white" frame="true" align="right" spinBox="true" caption="1nt4, resolution 2.4Å" /> '''Crystal structure of ...) |
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| - | [[Image:1nt4.gif|left|200px]]<br /><applet load="1nt4" size=" | + | [[Image:1nt4.gif|left|200px]]<br /><applet load="1nt4" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1nt4, resolution 2.4Å" /> | caption="1nt4, resolution 2.4Å" /> | ||
'''Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate'''<br /> | '''Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The Escherichia coli periplasmic glucose-1-phosphatase is a member of the | + | The Escherichia coli periplasmic glucose-1-phosphatase is a member of the histidine acid phosphatase family and acts primarily as a glucose scavenger. Previous substrate profiling studies have demonstrated some of the intriguing properties of the enzyme, including its unique and highly selective inositol phosphatase activity. The enzyme is also potentially involved in pathogenic inositol phosphate signal transduction pathways via type III secretion into the host cell. We have determined the crystal structure of E. coli glucose-1-phosphatase in an effort to unveil the structural mechanism underlying such unique substrate specificity. The structure was determined by the method of multiwavelength anomalous dispersion using a tungstate derivative together with the H18A inactive mutant complex structure with glucose 1-phosphate at 2.4-A resolution. In the active site of glucose-1-phosphatase, there are two unique gating residues, Glu-196 and Leu-24, in addition to the conserved features of histidine acid phosphatases. Together they create steric and electrostatic constraints responsible for the unique selectivity of the enzyme toward phytate and glucose-1-phosphate as well as its unusually high pH optimum for the latter. Based on the structural characterization, we were able to derive simple structural principles that not only precisely explains the substrate specificity of glucose-1-phosphatase and the hydrolysis products of various inositol phosphate substrates but also rationalizes similar general characteristics across the histidine acid phosphatase family. |
==About this Structure== | ==About this Structure== | ||
| - | 1NT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with G1P as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Glucose-1-phosphatase Glucose-1-phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.10 3.1.3.10] Full crystallographic information is available from [http:// | + | 1NT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=G1P:'>G1P</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Glucose-1-phosphatase Glucose-1-phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.10 3.1.3.10] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NT4 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Glucose-1-phosphatase]] | [[Category: Glucose-1-phosphatase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: BSGI, Montreal-Kingston | + | [[Category: BSGI, Montreal-Kingston Bacterial Structural Genomics Initiative.]] |
| - | [[Category: Cottrill, M | + | [[Category: Cottrill, M A.]] |
| - | [[Category: Forsberg, C | + | [[Category: Forsberg, C W.]] |
[[Category: Jia, Z.]] | [[Category: Jia, Z.]] | ||
| - | [[Category: Lee, D | + | [[Category: Lee, D C.]] |
[[Category: G1P]] | [[Category: G1P]] | ||
[[Category: alpha domain]] | [[Category: alpha domain]] | ||
| Line 28: | Line 28: | ||
[[Category: structural genomics]] | [[Category: structural genomics]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:09:44 2008'' |
Revision as of 12:09, 21 February 2008
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Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate
Overview
The Escherichia coli periplasmic glucose-1-phosphatase is a member of the histidine acid phosphatase family and acts primarily as a glucose scavenger. Previous substrate profiling studies have demonstrated some of the intriguing properties of the enzyme, including its unique and highly selective inositol phosphatase activity. The enzyme is also potentially involved in pathogenic inositol phosphate signal transduction pathways via type III secretion into the host cell. We have determined the crystal structure of E. coli glucose-1-phosphatase in an effort to unveil the structural mechanism underlying such unique substrate specificity. The structure was determined by the method of multiwavelength anomalous dispersion using a tungstate derivative together with the H18A inactive mutant complex structure with glucose 1-phosphate at 2.4-A resolution. In the active site of glucose-1-phosphatase, there are two unique gating residues, Glu-196 and Leu-24, in addition to the conserved features of histidine acid phosphatases. Together they create steric and electrostatic constraints responsible for the unique selectivity of the enzyme toward phytate and glucose-1-phosphate as well as its unusually high pH optimum for the latter. Based on the structural characterization, we were able to derive simple structural principles that not only precisely explains the substrate specificity of glucose-1-phosphatase and the hydrolysis products of various inositol phosphate substrates but also rationalizes similar general characteristics across the histidine acid phosphatase family.
About this Structure
1NT4 is a Single protein structure of sequence from Escherichia coli with as ligand. Active as Glucose-1-phosphatase, with EC number 3.1.3.10 Full crystallographic information is available from OCA.
Reference
Functional insights revealed by the crystal structures of Escherichia coli glucose-1-phosphatase., Lee DC, Cottrill MA, Forsberg CW, Jia Z, J Biol Chem. 2003 Aug 15;278(33):31412-8. Epub 2003 Jun 1. PMID:12782623
Page seeded by OCA on Thu Feb 21 14:09:44 2008
Categories: Escherichia coli | Glucose-1-phosphatase | Single protein | BSGI, Montreal-Kingston Bacterial Structural Genomics Initiative. | Cottrill, M A. | Forsberg, C W. | Jia, Z. | Lee, D C. | G1P | Alpha domain | Alpha-beta domain | Bsgi | Enzyme-substrate complex | Montreal-kingston bacterial structural genomics initiative | Occluded active site | Structural genomics
