2ett

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[[Image:2ett.gif|left|200px]]
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{{STRUCTURE_2ett| PDB=2ett | SCENE= }}
{{STRUCTURE_2ett| PDB=2ett | SCENE= }}
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'''Solution Structure of Human Sorting Nexin 22 PX Domain'''
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===Solution Structure of Human Sorting Nexin 22 PX Domain===
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==Overview==
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The sorting nexins (SNXs) constitute a large group of PX domain-containing proteins that play critical roles in protein trafficking. We report here the solution structure of human sorting nexin 22 (SNX22). Although SNX22 has &lt;30% sequence identity with any PX domain protein of known structure, it was found to contain the alpha/beta fold and compact structural core characteristic of PX domains. Analysis of the backbone dynamics of SNX22 by NMR relaxation measurements revealed that the two walls of the ligand binding cleft undergo internal motions: on the picosecond timescale for the beta1/beta2 loop and on the micro- to millisecond timescale for the loop between the polyproline motif and helix alpha2. Regions of the SNX22 structure that differ from those of other PX domains include the loop connecting strands beta1 and beta2 and the loop connecting helices alpha1 and alpha2, which appear to be more mobile than corresponding loops in other known structures. The interaction of dibutanoyl-phosphatidylinositol-3-phosphate (dibutanoyl-PtdIns(3)P) with SNX22 was investigated by an NMR titration experiment, which identified the binding site in a basic cleft and indicated that ligand binding leads only to a local structural rearrangement as has been found with other PX domains. Because motions in the loops are damped out when dibutanoyl-PtdIns(3)P binds, entropic effects could contribute to the lower affinity of SNX22 for this ligand compared to other PX domains.
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(as it appears on PubMed at http://www.pubmed.gov), where 17400918 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17400918}}
==About this Structure==
==About this Structure==
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2ETT is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ETT OCA].
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2ETT is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ETT OCA].
==Reference==
==Reference==
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[[Category: Sorting nexin 22]]
[[Category: Sorting nexin 22]]
[[Category: Structural genomic]]
[[Category: Structural genomic]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Apr 30 13:24:42 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:03:11 2008''

Revision as of 11:03, 27 July 2008

Image:2ett.png

Template:STRUCTURE 2ett

Solution Structure of Human Sorting Nexin 22 PX Domain

Template:ABSTRACT PUBMED 17400918

About this Structure

2ETT is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

Solution structure of human sorting nexin 22., Song J, Zhao KQ, Newman CL, Vinarov DA, Markley JL, Protein Sci. 2007 May;16(5):807-14. Epub 2007 Mar 30. PMID:17400918

Page seeded by OCA on Sun Jul 27 14:03:11 2008

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