1oz6
From Proteopedia
(New page: 200px<br /><applet load="1oz6" size="450" color="white" frame="true" align="right" spinBox="true" caption="1oz6, resolution 2.60Å" /> '''X-ray structure of a...) |
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| - | [[Image:1oz6.gif|left|200px]]<br /><applet load="1oz6" size=" | + | [[Image:1oz6.gif|left|200px]]<br /><applet load="1oz6" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1oz6, resolution 2.60Å" /> | caption="1oz6, resolution 2.60Å" /> | ||
'''X-ray structure of acidic phospholipase A2 from Indian saw-scaled viper (Echis carinatus) with a potent platelet aggregation inhibitory activity'''<br /> | '''X-ray structure of acidic phospholipase A2 from Indian saw-scaled viper (Echis carinatus) with a potent platelet aggregation inhibitory activity'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structure of an acidic phospholipase A(2) from the venom of | + | The crystal structure of an acidic phospholipase A(2) from the venom of Echis carinatus (saw-scaled viper; scPLA(2)) has been determined at 2.6 A resolution and refined to a crystallographic R factor of 0.192. Although the overall structure of scPLA(2) is essentially similar to those of other group II acidic PLA(2)s from different species, it shows unique features in several parts. Particularly noteworthy is the C-terminal part, which folds differently to those of other group II PLA(2)s. This part is considered to be responsible for inhibition of the platelet-aggregation activity. The calcium-binding loop is tightly organized with sevenfold coordination. Another striking feature of scPLA(2) is the involvement of Asn79 O(delta1) of a symmetry-related molecule in a coordination linkage with Ca(2+) of the calcium-binding loop. This is the first observation of an internal metal ion participating in an intermolecular interaction. The beta-wing of a molecule is deeply inserted into the hydrophobic channel of another molecule and forms several intermolecular interactions. This results in the formation of an infinite chain of molecules. These chains are stacked in an antiparallel arrangement in the crystals. |
==About this Structure== | ==About this Structure== | ||
| - | 1OZ6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Echis_carinatus Echis carinatus] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Phospholipase_A(2) Phospholipase A(2)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.4 3.1.1.4] Full crystallographic information is available from [http:// | + | 1OZ6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Echis_carinatus Echis carinatus] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Phospholipase_A(2) Phospholipase A(2)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.4 3.1.1.4] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OZ6 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Jasti, J.]] | [[Category: Jasti, J.]] | ||
[[Category: Paramasivam, M.]] | [[Category: Paramasivam, M.]] | ||
| - | [[Category: Singh, T | + | [[Category: Singh, T P.]] |
[[Category: Srinivasan, A.]] | [[Category: Srinivasan, A.]] | ||
[[Category: CA]] | [[Category: CA]] | ||
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[[Category: pla2]] | [[Category: pla2]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:23:19 2008'' |
Revision as of 12:23, 21 February 2008
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X-ray structure of acidic phospholipase A2 from Indian saw-scaled viper (Echis carinatus) with a potent platelet aggregation inhibitory activity
Overview
The crystal structure of an acidic phospholipase A(2) from the venom of Echis carinatus (saw-scaled viper; scPLA(2)) has been determined at 2.6 A resolution and refined to a crystallographic R factor of 0.192. Although the overall structure of scPLA(2) is essentially similar to those of other group II acidic PLA(2)s from different species, it shows unique features in several parts. Particularly noteworthy is the C-terminal part, which folds differently to those of other group II PLA(2)s. This part is considered to be responsible for inhibition of the platelet-aggregation activity. The calcium-binding loop is tightly organized with sevenfold coordination. Another striking feature of scPLA(2) is the involvement of Asn79 O(delta1) of a symmetry-related molecule in a coordination linkage with Ca(2+) of the calcium-binding loop. This is the first observation of an internal metal ion participating in an intermolecular interaction. The beta-wing of a molecule is deeply inserted into the hydrophobic channel of another molecule and forms several intermolecular interactions. This results in the formation of an infinite chain of molecules. These chains are stacked in an antiparallel arrangement in the crystals.
About this Structure
1OZ6 is a Single protein structure of sequence from Echis carinatus with as ligand. Active as Phospholipase A(2), with EC number 3.1.1.4 Full crystallographic information is available from OCA.
Reference
Structure of an acidic phospholipase A2 from Indian saw-scaled viper (Echis carinatus) at 2.6 A resolution reveals a novel intermolecular interaction., Jasti J, Paramasivam M, Srinivasan A, Singh TP, Acta Crystallogr D Biol Crystallogr. 2004 Jan;60(Pt 1):66-72. Epub 2003, Dec 18. PMID:14684894
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