1it4: Difference between revisions

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[[Image:1it4.gif|left|200px]]<br /><applet load="1it4" size="~~450~~" color="white" frame="true" align="right" spinBox="true"

[[Image:1it4.gif|left|200px]]<br /><applet load="1it4" size="350" color="white" frame="true" align="right" spinBox="true"

caption="1it4" />

'''Solution structure of the prokaryotic Phospholipase A2 from Streptomyces violaceoruber'''<br />

==Overview==

Until now, phospholipase A(2) (PLA(2); EC 3.1.14) has been found only from, eukaryotic sources. In the present study, we found a secreted PLA(2), which is produced by a soil bacterium, Streptomyces violaceoruber A-2688, demonstrating that the enzyme is the first phospholipase A(2) identified, in prokaryote. After characterization of the novel PLA(2), a gene encoding, the enzyme was cloned, sequenced, and overexpressed using a Streptomyces, host-vector system. The amino acid sequence showed that the prokaryotic, PLA(2) has only four cysteines and less homology to the eukaryotic ones, which have 12-16 cysteines. The solution structures of the prokaryotic, PLA(2), bound and unbound with calcium(II) ion, were determined by using, the NMR technique and structure calculation. The overall structure of the, S. violaceoruber PLA(2), which is composed of only five alpha-helices, is, completely different from those of eukaryotic PLA(2)s, which consist of, beta-sheets and alpha-helices. The structure of the calcium-binding domain, is obviously distinct from that without the ion; the ligands for the, calcium(II) ion are the two carboxylates of Asp(43) (monodentate) and, Asp(65) (bidentate), the carbonyl oxygen of Leu(44), and three water, molecules. A calcium-binding experiment showed that the calcium, dissociation constant ( approximately 5 mm) for the prokaryotic PLA(2) is, much larger than those of eukaryotic ones.

Until now, phospholipase A(2) (PLA(2); EC 3.1.14) has been found only from eukaryotic sources. In the present study, we found a secreted PLA(2), which is produced by a soil bacterium, Streptomyces violaceoruber A-2688, demonstrating that the enzyme is the first phospholipase A(2) identified in prokaryote. After characterization of the novel PLA(2), a gene encoding the enzyme was cloned, sequenced, and overexpressed using a Streptomyces host-vector system. The amino acid sequence showed that the prokaryotic PLA(2) has only four cysteines and less homology to the eukaryotic ones, which have 12-16 cysteines. The solution structures of the prokaryotic PLA(2), bound and unbound with calcium(II) ion, were determined by using the NMR technique and structure calculation. The overall structure of the S. violaceoruber PLA(2), which is composed of only five alpha-helices, is completely different from those of eukaryotic PLA(2)s, which consist of beta-sheets and alpha-helices. The structure of the calcium-binding domain is obviously distinct from that without the ion; the ligands for the calcium(II) ion are the two carboxylates of Asp(43) (monodentate) and Asp(65) (bidentate), the carbonyl oxygen of Leu(44), and three water molecules. A calcium-binding experiment showed that the calcium dissociation constant ( approximately 5 mm) for the prokaryotic PLA(2) is much larger than those of eukaryotic ones.

==About this Structure==

1IT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_violaceoruber Streptomyces violaceoruber] 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://~~ispc~~.weizmann.ac.il/oca-bin/ocashort?id=1IT4 OCA].

1IT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_violaceoruber Streptomyces violaceoruber] 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=1IT4 OCA].

==Reference==

Line 21:

[[Category: prokaryotic pla2]]

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@@ Line 1: / Line 1: @@
-[[Image:1it4.gif|left|200px]]<br /><applet load="1it4" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:1it4.gif|left|200px]]<br /><applet load="1it4" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="1it4" />
 '''Solution structure of the prokaryotic Phospholipase A2 from Streptomyces violaceoruber'''<br />
 ==Overview==
-Until now, phospholipase A(2) (PLA(2); EC 3.1.14) has been found only from, eukaryotic sources. In the present study, we found a secreted PLA(2), which is produced by a soil bacterium, Streptomyces violaceoruber A-2688, demonstrating that the enzyme is the first phospholipase A(2) identified, in prokaryote. After characterization of the novel PLA(2), a gene encoding, the enzyme was cloned, sequenced, and overexpressed using a Streptomyces, host-vector system. The amino acid sequence showed that the prokaryotic, PLA(2) has only four cysteines and less homology to the eukaryotic ones, which have 12-16 cysteines. The solution structures of the prokaryotic, PLA(2), bound and unbound with calcium(II) ion, were determined by using, the NMR technique and structure calculation. The overall structure of the, S. violaceoruber PLA(2), which is composed of only five alpha-helices, is, completely different from those of eukaryotic PLA(2)s, which consist of, beta-sheets and alpha-helices. The structure of the calcium-binding domain, is obviously distinct from that without the ion; the ligands for the, calcium(II) ion are the two carboxylates of Asp(43) (monodentate) and, Asp(65) (bidentate), the carbonyl oxygen of Leu(44), and three water, molecules. A calcium-binding experiment showed that the calcium, dissociation constant ( approximately 5 mm) for the prokaryotic PLA(2) is, much larger than those of eukaryotic ones.
+Until now, phospholipase A(2) (PLA(2); EC 3.1.14) has been found only from eukaryotic sources. In the present study, we found a secreted PLA(2), which is produced by a soil bacterium, Streptomyces violaceoruber A-2688, demonstrating that the enzyme is the first phospholipase A(2) identified in prokaryote. After characterization of the novel PLA(2), a gene encoding the enzyme was cloned, sequenced, and overexpressed using a Streptomyces host-vector system. The amino acid sequence showed that the prokaryotic PLA(2) has only four cysteines and less homology to the eukaryotic ones, which have 12-16 cysteines. The solution structures of the prokaryotic PLA(2), bound and unbound with calcium(II) ion, were determined by using the NMR technique and structure calculation. The overall structure of the S. violaceoruber PLA(2), which is composed of only five alpha-helices, is completely different from those of eukaryotic PLA(2)s, which consist of beta-sheets and alpha-helices. The structure of the calcium-binding domain is obviously distinct from that without the ion; the ligands for the calcium(II) ion are the two carboxylates of Asp(43) (monodentate) and Asp(65) (bidentate), the carbonyl oxygen of Leu(44), and three water molecules. A calcium-binding experiment showed that the calcium dissociation constant ( approximately 5 mm) for the prokaryotic PLA(2) is much larger than those of eukaryotic ones.
 ==About this Structure==
-IT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_violaceoruber Streptomyces violaceoruber] 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://ispc.weizmann.ac.il/oca-bin/ocashort?id=1IT4 OCA].
+IT4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_violaceoruber Streptomyces violaceoruber] 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=1IT4 OCA].
 ==Reference==
@@ Line 21: / Line 21: @@
 [[Category: prokaryotic pla2]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Sat Nov 24 22:30:25 2007''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:15:22 2008''