2d8o
From Proteopedia
(New page: 200px<br /><applet load="2d8o" size="450" color="white" frame="true" align="right" spinBox="true" caption="2d8o, resolution 2.38Å" /> '''Structure of VIL-tha...) |
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| - | [[Image:2d8o.gif|left|200px]]<br /><applet load="2d8o" size=" | + | [[Image:2d8o.gif|left|200px]]<br /><applet load="2d8o" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2d8o, resolution 2.38Å" /> | caption="2d8o, resolution 2.38Å" /> | ||
'''Structure of VIL-thaumatin'''<br /> | '''Structure of VIL-thaumatin'''<br /> | ||
==Overview== | ==Overview== | ||
| - | New techniques are presented for the preparation of iodine derivatives, involving vapour diffusion of iodine. Firstly, in the vaporizing iodine | + | New techniques are presented for the preparation of iodine derivatives, involving vapour diffusion of iodine. Firstly, in the vaporizing iodine labelling (VIL) technique, a small amount of KI/I(2) solution is enclosed in a crystallization well, with the result that gaseous I(2) molecules diffuse into the crystallization droplets without exerting substantial changes in ionic strength in the target crystals. Once they have diffused into the droplet, the I(2) molecules sometimes iodinate accessible tyrosines at ortho positions. Secondly, when iodination is insufficient, the hydrogen peroxide VIL (HYPER-VIL) technique can be further applied to increase the iodination ratio by the addition of a small droplet of hydrogen peroxide (H(2)O(2)) to the crystallization well; the gaseous H(2)O(2) also diffuses into the crystallization droplet to emphasize the iodination. These techniques are most effective for phase determination when coupled with softer X-rays, such as those from Cu Kalpha or Cr Kalpha radiation. The effectiveness of these techniques was assessed using five different crystals. Four of the crystals were successfully iodinated, providing sufficient phasing power for structure determination. |
==About this Structure== | ==About this Structure== | ||
| - | 2D8O is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thaumatococcus_daniellii Thaumatococcus daniellii] with IOD as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 2D8O is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thaumatococcus_daniellii Thaumatococcus daniellii] with <scene name='pdbligand=IOD:'>IOD</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2D8O OCA]. |
==Reference== | ==Reference== | ||
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[[Category: vaporizing iodine labeling(vil)]] | [[Category: vaporizing iodine labeling(vil)]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:56:14 2008'' |
Revision as of 14:56, 21 February 2008
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Structure of VIL-thaumatin
Overview
New techniques are presented for the preparation of iodine derivatives, involving vapour diffusion of iodine. Firstly, in the vaporizing iodine labelling (VIL) technique, a small amount of KI/I(2) solution is enclosed in a crystallization well, with the result that gaseous I(2) molecules diffuse into the crystallization droplets without exerting substantial changes in ionic strength in the target crystals. Once they have diffused into the droplet, the I(2) molecules sometimes iodinate accessible tyrosines at ortho positions. Secondly, when iodination is insufficient, the hydrogen peroxide VIL (HYPER-VIL) technique can be further applied to increase the iodination ratio by the addition of a small droplet of hydrogen peroxide (H(2)O(2)) to the crystallization well; the gaseous H(2)O(2) also diffuses into the crystallization droplet to emphasize the iodination. These techniques are most effective for phase determination when coupled with softer X-rays, such as those from Cu Kalpha or Cr Kalpha radiation. The effectiveness of these techniques was assessed using five different crystals. Four of the crystals were successfully iodinated, providing sufficient phasing power for structure determination.
About this Structure
2D8O is a Single protein structure of sequence from Thaumatococcus daniellii with as ligand. Full crystallographic information is available from OCA.
Reference
New methods to prepare iodinated derivatives by vaporizing iodine labelling (VIL) and hydrogen peroxide VIL (HYPER-VIL)., Miyatake H, Hasegawa T, Yamano A, Acta Crystallogr D Biol Crystallogr. 2006 Mar;62(Pt 3):280-9. Epub 2006, Feb 22. PMID:16510975
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