1sx7: Difference between revisions

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[[Image:1sx7.jpg|left|200px]]
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[[Image:1sx7.png|left|200px]]


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{{STRUCTURE_1sx7|  PDB=1sx7  |  SCENE=  }}  
{{STRUCTURE_1sx7|  PDB=1sx7  |  SCENE=  }}  


'''Use of an ion-binding site to bypass the 1000-atom limit to ab initio structure determination by direct methods'''
===Use of an ion-binding site to bypass the 1000-atom limit to ab initio structure determination by direct methods===




==Overview==
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Proteins with more than 1000 non-H atoms and without heavy-atom prosthetic groups are very difficult to solve by ab initio direct methods. T4 lysozyme is being used to explore these limits. The protein has 1309 non-H atoms, seven S atoms, no disulfide bonds and no heavy-atom prosthetic group. It is recalcitrant to structure determination by direct methods using X-ray diffraction data to 0.97 A. It is shown here that it is possible to obtain a truly ab initio structure determination of a variant of the protein that has an Rb+ (Z = 37) binding site. Using diffraction data to 1.06 A resolution, the direct-methods programs SIR2002 and ACORN independently solved the structure in about 20 h. The bound Rb+, which contributes about 1.7% of the total scattering, does not appear to distort the structure or to inhibit refinement (R factor 12.1%). The phases obtained via SIR2002 or ACORN are in good agreement with those from a reference structure obtained from conventional molecular-substitution and refinement procedures (average error in the figure-of-merit-weighted phases of less than 25 degrees). Thus, proteins with more than 1000 atoms that include halide-binding or other such sites may be amenable to structure determination by ab initio direct methods. The direct-methods approaches are also compared with structure determination via use of the anomalous scattering of the Rb+ ion. As shown by examples, high-resolution structures determined by direct methods can be useful in highlighting regions of strain in the protein, including short hydrogen bonds and non-planar peptide groups.
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{{ABSTRACT_PUBMED_15388918}}


==About this Structure==
==About this Structure==
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[[Category: Mooers, B H.M.]]
[[Category: Mooers, B H.M.]]
[[Category: Ab initio direct method]]
[[Category: Ab initio direct method]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 09:14:32 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 01:02:16 2008''

Revision as of 22:02, 27 July 2008

File:1sx7.png

Template:STRUCTURE 1sx7

Use of an ion-binding site to bypass the 1000-atom limit to ab initio structure determination by direct methods

Template:ABSTRACT PUBMED 15388918

About this Structure

1SX7 is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

Reference

Use of an ion-binding site to bypass the 1000-atom limit to structure determination by direct methods., Mooers BH, Matthews BW, Acta Crystallogr D Biol Crystallogr. 2004 Oct;60(Pt 10):1726-37. Epub 2004, Sep 23. PMID:15388918

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