2bd1
From Proteopedia
(New page: 200px<br /><applet load="2bd1" size="450" color="white" frame="true" align="right" spinBox="true" caption="2bd1, resolution 1.90Å" /> '''A possible role of t...) |
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| - | [[Image:2bd1.gif|left|200px]]<br /><applet load="2bd1" size=" | + | [[Image:2bd1.gif|left|200px]]<br /><applet load="2bd1" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2bd1, resolution 1.90Å" /> | caption="2bd1, resolution 1.90Å" /> | ||
'''A possible role of the second calcium ion in interfacial binding: Atomic and medium resolution crystal structures of the quadruple mutant of phospholipase A2'''<br /> | '''A possible role of the second calcium ion in interfacial binding: Atomic and medium resolution crystal structures of the quadruple mutant of phospholipase A2'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structures of the monoclinic and trigonal forms of the | + | The crystal structures of the monoclinic and trigonal forms of the quadruple mutant K53,56,120,121M of recombinant bovine pancreatic phospholipase A2 (PLA2) have been solved and refined at 1.9 and 1.1 A resolution, respectively. Interestingly, the monoclinic form reveals the presence of the second calcium ion. Furthermore, the surface-loop residues are ordered and the conformation of residues 62-66 is similar to that observed in other structures containing the second calcium ion. On the other hand, in the trigonal form the surface loop is disordered and the second calcium is absent. Docking studies suggest that the second calcium and residues Lys62 and Asp66 from the surface loop could be involved in the interaction with the polar head group of the membrane phospholipid. It is hypothesized that the two structures of the quadruple mutant, monoclinic and trigonal, represent the conformations of PLA2 at the lipid interface and in solution, respectively. A docked structure with a phospholipid molecule and with a transition-state analogue bound, one at the active site coordinating to the catalytic calcium and the other at the second calcium site, but both at the i-face, is presented. |
==About this Structure== | ==About this Structure== | ||
| - | 2BD1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with CA and MPD as [http://en.wikipedia.org/wiki/ligands ligands]. 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:// | + | 2BD1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=CA:'>CA</scene> and <scene name='pdbligand=MPD:'>MPD</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. 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=2BD1 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Sekar, K.]] | [[Category: Sekar, K.]] | ||
| - | [[Category: Tsai, M | + | [[Category: Tsai, M D.]] |
[[Category: Velmurugan, D.]] | [[Category: Velmurugan, D.]] | ||
[[Category: CA]] | [[Category: CA]] | ||
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[[Category: beta sheet]] | [[Category: beta sheet]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:36:30 2008'' |
Revision as of 14:36, 21 February 2008
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A possible role of the second calcium ion in interfacial binding: Atomic and medium resolution crystal structures of the quadruple mutant of phospholipase A2
Overview
The crystal structures of the monoclinic and trigonal forms of the quadruple mutant K53,56,120,121M of recombinant bovine pancreatic phospholipase A2 (PLA2) have been solved and refined at 1.9 and 1.1 A resolution, respectively. Interestingly, the monoclinic form reveals the presence of the second calcium ion. Furthermore, the surface-loop residues are ordered and the conformation of residues 62-66 is similar to that observed in other structures containing the second calcium ion. On the other hand, in the trigonal form the surface loop is disordered and the second calcium is absent. Docking studies suggest that the second calcium and residues Lys62 and Asp66 from the surface loop could be involved in the interaction with the polar head group of the membrane phospholipid. It is hypothesized that the two structures of the quadruple mutant, monoclinic and trigonal, represent the conformations of PLA2 at the lipid interface and in solution, respectively. A docked structure with a phospholipid molecule and with a transition-state analogue bound, one at the active site coordinating to the catalytic calcium and the other at the second calcium site, but both at the i-face, is presented.
About this Structure
2BD1 is a Single protein structure of sequence from Bos taurus with and as ligands. Active as Phospholipase A(2), with EC number 3.1.1.4 Full crystallographic information is available from OCA.
Reference
Suggestive evidence for the involvement of the second calcium and surface loop in interfacial binding: monoclinic and trigonal crystal structures of a quadruple mutant of phospholipase A2., Sekar K, Yogavel M, Kanaujia SP, Sharma A, Velmurugan D, Poi MJ, Dauter Z, Tsai MD, Acta Crystallogr D Biol Crystallogr. 2006 Jul;62(Pt 7):717-24. Epub 2006, Jun 20. PMID:16790927
Page seeded by OCA on Thu Feb 21 16:36:30 2008
Categories: Bos taurus | Phospholipase A(2) | Single protein | Sekar, K. | Tsai, M D. | Velmurugan, D. | CA | MPD | Alpha helix | Beta sheet
