1lqo: Difference between revisions

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[[Image:1lqo.gif|left|200px]]<br /><applet load="1lqo" size="~~450~~" color="white" frame="true" align="right" spinBox="true"

[[Image:1lqo.gif|left|200px]]<br /><applet load="1lqo" size="350" color="white" frame="true" align="right" spinBox="true"

caption="1lqo, resolution 2.00Å" />

'''Crystal Strutcure of the Fosfomycin Resistance Protein A (FosA) Containing Bound Thallium Cations'''<br />

==Overview==

The fosfomycin resistance protein (FosA) catalyzes the Mn(II)- and K+-dependent addition of glutathione to the oxirane of the antibiotic fosfomycin. The crystal structure of FosA from Pseudomonas aeruginosa was solved at a resolution of 1.19 A by multiwavelength anomalous diffraction at the L-III edge of a Tl+ derivative. The structure solution took advantage of the ability of Tl+ to substitute for K+. The existence of multiple Tl sites in the asymmetric unit suggests that this may be a generally useful technique for phasing protein crystal structures. A 1.35 A resolution structure with phosphate bound in the active site shows that the Mn(II) center has a rare four-coordinate geometry. The structure of the fosfomycin complex at 1.19 A resolution indicates that the Mn(II) center is close to five-coordinate with trigonal bipyramidal geometry and a ligand set consisting of two histidines (H7 and H64) and one phosphonate oxygen occupying the equatorial sites and the carboxylate of E110 at one of the apical sites. The oxirane oxygen of the substrate is located at the other apical site but is 0.2 A beyond the average Mn-O distance for five-coordinate Mn(II). The Mn(II) center is proposed to stabilize the alkoxide in the transition state, while the nearby hydroxyl group of T9 acts as a proton donor in the reaction. The K+ ion located 6.5 A from the Mn(II) appears to help orient the substrate for nucleophilic attack.

==About this Structure==

1LQO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa] with PO4, MN and TL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] Full crystallographic information is available from [http://~~ispc~~.weizmann.ac.il/oca-bin/ocashort?id=1LQO OCA].

1LQO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa] with <scene name='pdbligand=PO4:'>PO4</scene>, <scene name='pdbligand=MN:'>MN</scene> and <scene name='pdbligand=TL:'>TL</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LQO OCA].

==Reference==

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[[Category: Pseudomonas aeruginosa]]

[[Category: Single protein]]

[[Category: Armstrong, R.N.]]

[[Category: Armstrong, R N.]]

[[Category: Newcomer, M.E.]]

[[Category: Newcomer, M E.]]

[[Category: Pharris, R.E.]]

[[Category: Pharris, R E.]]

[[Category: Rife, C.L.]]

[[Category: Rife, C L.]]

[[Category: MN]]

[[Category: PO4]]

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[[Category: thallium binding loop]]

''Page seeded by [http://~~ispc~~.weizmann.ac.il/oca OCA ] on ~~Tue Nov 20 20~~:47:~~20 2007~~''

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:47:28 2008''

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@@ Line 1: / Line 1: @@
-[[Image:1lqo.gif|left|200px]]<br /><applet load="1lqo" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:1lqo.gif|left|200px]]<br /><applet load="1lqo" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="1lqo, resolution 2.00&Aring;" />
 '''Crystal Strutcure of the Fosfomycin Resistance Protein A (FosA) Containing Bound Thallium Cations'''<br />
+==Overview==
+The fosfomycin resistance protein (FosA) catalyzes the Mn(II)- and K+-dependent addition of glutathione to the oxirane of the antibiotic fosfomycin. The crystal structure of FosA from Pseudomonas aeruginosa was solved at a resolution of 1.19 A by multiwavelength anomalous diffraction at the L-III edge of a Tl+ derivative. The structure solution took advantage of the ability of Tl+ to substitute for K+. The existence of multiple Tl sites in the asymmetric unit suggests that this may be a generally useful technique for phasing protein crystal structures. A 1.35 A resolution structure with phosphate bound in the active site shows that the Mn(II) center has a rare four-coordinate geometry. The structure of the fosfomycin complex at 1.19 A resolution indicates that the Mn(II) center is close to five-coordinate with trigonal bipyramidal geometry and a ligand set consisting of two histidines (H7 and H64) and one phosphonate oxygen occupying the equatorial sites and the carboxylate of E110 at one of the apical sites. The oxirane oxygen of the substrate is located at the other apical site but is 0.2 A beyond the average Mn-O distance for five-coordinate Mn(II). The Mn(II) center is proposed to stabilize the alkoxide in the transition state, while the nearby hydroxyl group of T9 acts as a proton donor in the reaction. The K+ ion located 6.5 A from the Mn(II) appears to help orient the substrate for nucleophilic attack.
 ==About this Structure==
-LQO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa] with PO4, MN and TL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1LQO OCA].
+LQO is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa] with <scene name='pdbligand=PO4:'>PO4</scene>, <scene name='pdbligand=MN:'>MN</scene> and <scene name='pdbligand=TL:'>TL</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LQO OCA].
 ==Reference==
@@ Line 11: / Line 14: @@
 [[Category: Pseudomonas aeruginosa]]
 [[Category: Single protein]]
-[[Category: Armstrong, R.N.]]
+[[Category: Armstrong, R N.]]
-[[Category: Newcomer, M.E.]]
+[[Category: Newcomer, M E.]]
-[[Category: Pharris, R.E.]]
+[[Category: Pharris, R E.]]
-[[Category: Rife, C.L.]]
+[[Category: Rife, C L.]]
 [[Category: MN]]
 [[Category: PO4]]
@@ Line 21: / Line 24: @@
 [[Category: thallium binding loop]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 20:47:20 2007''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:47:28 2008''