2d28
From Proteopedia
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|PDB= 2d28 |SIZE=350|CAPTION= <scene name='initialview01'>2d28</scene>, resolution 2.000Å | |PDB= 2d28 |SIZE=350|CAPTION= <scene name='initialview01'>2d28</scene>, resolution 2.000Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CAC:CACODYLATE ION'>CAC</scene> | + | |LIGAND= <scene name='pdbligand=CAC:CACODYLATE+ION'>CAC</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= xpsE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=339 Xanthomonas campestris]) | |GENE= xpsE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=339 Xanthomonas campestris]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[2d27|2D27]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2d28 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2d28 OCA], [http://www.ebi.ac.uk/pdbsum/2d28 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2d28 RCSB]</span> | ||
}} | }} | ||
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[[Category: Huang, C W.]] | [[Category: Huang, C W.]] | ||
[[Category: Shiue, S J.]] | [[Category: Shiue, S J.]] | ||
| - | [[Category: CAC]] | ||
[[Category: alpha-beta sandwich]] | [[Category: alpha-beta sandwich]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 02:29:20 2008'' |
Revision as of 23:29, 30 March 2008
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| , resolution 2.000Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , | ||||||
| Gene: | xpsE (Xanthomonas campestris) | ||||||
| Related: | 2D27
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure of the N-terminal domain of XpsE (crystal form P43212)
Overview
Secretion of fully folded extracellular proteins across the outer membrane of Gram-negative bacteria is mainly assisted by the ATP-dependent type II secretion system (T2SS). Depending on species, 12-15 proteins are usually required for the function of T2SS by forming a trans-envelope multiprotein secretion complex. Here we report crystal structures of an essential component of the Xanthomonas campestris T2SS, the 21-kDa N-terminal domain of cytosolic secretion ATPase XpsE (XpsEN), in two conformational states. By mediating interaction between XpsE and the cytoplasmic membrane protein XpsL, XpsEN anchors XpsE to the membrane-associated secretion complex to allow the coupling between ATP utilization and exoprotein secretion. The structure of XpsEN observed in crystal form P4(3)2(1)2 is composed of a 90-residue alpha/beta sandwich core domain capped by a 62-residue N-terminal helical region. The core domain exhibits structural similarity with the NifU-like domain, suggesting that XpsE(N) may be involved in the regulation of XpsE ATPase activity. Surprisingly, although a similar core domain structure was observed in crystal form I4(1)22, the N-terminal 36 residues of the helical region undergo a large structural rearrangement. Deletion analysis indicates that these residues are required for exoprotein secretion by mediating the XpsE/XpsL interaction. Site-directed mutagenesis study further suggests the more compact conformation observed in the P4(3)2(1)2 crystal likely represents the XpsL binding-competent state. Based on these findings, we speculate that XpsE might function in T2SS by cycling between two conformational states. As a closely related protein to XpsE, secretion ATPase PilB may function similarly in the type IV pilus assembly.
About this Structure
2D28 is a Single protein structure of sequence from Xanthomonas campestris. Full crystallographic information is available from OCA.
Reference
Structure and function of the XpsE N-terminal domain, an essential component of the Xanthomonas campestris type II secretion system., Chen Y, Shiue SJ, Huang CW, Chang JL, Chien YL, Hu NT, Chan NL, J Biol Chem. 2005 Dec 23;280(51):42356-63. Epub 2005 Sep 14. PMID:16162504
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