1gwa

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{{STRUCTURE_1gwa| PDB=1gwa | SCENE= }}
{{STRUCTURE_1gwa| PDB=1gwa | SCENE= }}
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'''TRIIODIDE DERIVATIVE OF PORCINE PANCREAS ELASTASE'''
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===TRIIODIDE DERIVATIVE OF PORCINE PANCREAS ELASTASE===
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==Overview==
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A series of experiments performed at Cu Kalpha wavelength on in-house X-ray equipment are presented which investigate two possibilities for enhancing the experimental phasing signal by means of (i) triiodide/iodide soaks using KI/I(2) and (ii) combinations of counter-ions introduced using the short cryosoak method. Triiodide-derivative crystal structures for five test proteins have been refined and reveal that iodine can bind as polyiodide and single iodide ions through hydrophobic and hydrogen-bonding interactions both at the molecular surface and in intramolecular and intermolecular cavities. In three cases, the structures could be automatically determined with autoSHARP using in-house SAD and SIRAS data. The investigation of combinatorial counter-ion replacement using multiple salts with Na(+) and Cs(+) as cations and I(-) and Cl(-) as anions reveals that, for the case of hen egg-white lysozyme, significant improvement in phasing signal is obtained by the combined use of salts compared with SIRAS methods using native and single short-soak derivative data sets.
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{{ABSTRACT_PUBMED_12037300}}
==About this Structure==
==About this Structure==
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[[Category: Signal]]
[[Category: Signal]]
[[Category: Zymogen]]
[[Category: Zymogen]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:05:27 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:12:26 2008''

Revision as of 03:12, 1 July 2008

Image:1gwa.png

Template:STRUCTURE 1gwa

TRIIODIDE DERIVATIVE OF PORCINE PANCREAS ELASTASE

Template:ABSTRACT PUBMED 12037300

About this Structure

1GWA is a Single protein structure of sequence from Sus scrofa. Full crystallographic information is available from OCA.

Reference

Triiodide derivatization and combinatorial counter-ion replacement: two methods for enhancing phasing signal using laboratory Cu Kalpha X-ray equipment., Evans G, Bricogne G, Acta Crystallogr D Biol Crystallogr. 2002 Jun;58(Pt 6 Pt 2):976-91. Epub, 2002 May 29. PMID:12037300

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