1s21
From Proteopedia
(New page: 200px<br /><applet load="1s21" size="450" color="white" frame="true" align="right" spinBox="true" caption="1s21, resolution 2.00Å" /> '''Crystal Structure of...) |
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| - | [[Image:1s21.gif|left|200px]]<br /><applet load="1s21" size=" | + | [[Image:1s21.gif|left|200px]]<br /><applet load="1s21" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1s21, resolution 2.00Å" /> | caption="1s21, resolution 2.00Å" /> | ||
'''Crystal Structure of AvrPphF ORF2, A Type III Effector from P. syringae'''<br /> | '''Crystal Structure of AvrPphF ORF2, A Type III Effector from P. syringae'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The avrPphF locus from Pseudomonas syringae pv. phaseolicola, the | + | The avrPphF locus from Pseudomonas syringae pv. phaseolicola, the causative agent of bean halo-blight disease, encodes proteins which either enhance virulence on susceptible hosts or elicit defense responses on hosts carrying the R1 resistance gene. Here we present the crystal structures of the two proteins from the avrPphF operon. The structure of AvrPphF ORF1 is strikingly reminiscent of type III chaperones from bacterial pathogens of animals, indicating structural conservation of these specialized chaperones, despite high sequence divergence. The AvrPphF ORF2 effector adopts a novel "mushroom"-like structure containing "head" and "stalk" subdomains. The head subdomain possesses limited structural homology to the catalytic domain of bacterial ADP-ribosyltransferases (ADP-RTs), though no ADP-RT activity was detected for AvrPphF ORF2 in standard assays. Nonetheless, this structural similarity identified two clusters of conserved surface-exposed residues important for both virulence mediated by AvrPphF ORF2 and recognition of this effector by bean plants expressing the R1 resistance gene. |
==About this Structure== | ==About this Structure== | ||
| - | 1S21 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_syringae_pv._phaseolicola Pseudomonas syringae pv. phaseolicola]. Full crystallographic information is available from [http:// | + | 1S21 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_syringae_pv._phaseolicola Pseudomonas syringae pv. phaseolicola]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S21 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Betts, L.]] | [[Category: Betts, L.]] | ||
| - | [[Category: Chang, J | + | [[Category: Chang, J H.]] |
| - | [[Category: Dangl, J | + | [[Category: Dangl, J K.]] |
[[Category: Desveaux, D.]] | [[Category: Desveaux, D.]] | ||
| - | [[Category: Grant, S | + | [[Category: Grant, S R.]] |
[[Category: Nimchuk, Z.]] | [[Category: Nimchuk, Z.]] | ||
| - | [[Category: Singer, A | + | [[Category: Singer, A U.]] |
[[Category: Sondek, J.]] | [[Category: Sondek, J.]] | ||
[[Category: predominantly beta-strand]] | [[Category: predominantly beta-strand]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:57:04 2008'' |
Revision as of 12:57, 21 February 2008
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Crystal Structure of AvrPphF ORF2, A Type III Effector from P. syringae
Overview
The avrPphF locus from Pseudomonas syringae pv. phaseolicola, the causative agent of bean halo-blight disease, encodes proteins which either enhance virulence on susceptible hosts or elicit defense responses on hosts carrying the R1 resistance gene. Here we present the crystal structures of the two proteins from the avrPphF operon. The structure of AvrPphF ORF1 is strikingly reminiscent of type III chaperones from bacterial pathogens of animals, indicating structural conservation of these specialized chaperones, despite high sequence divergence. The AvrPphF ORF2 effector adopts a novel "mushroom"-like structure containing "head" and "stalk" subdomains. The head subdomain possesses limited structural homology to the catalytic domain of bacterial ADP-ribosyltransferases (ADP-RTs), though no ADP-RT activity was detected for AvrPphF ORF2 in standard assays. Nonetheless, this structural similarity identified two clusters of conserved surface-exposed residues important for both virulence mediated by AvrPphF ORF2 and recognition of this effector by bean plants expressing the R1 resistance gene.
About this Structure
1S21 is a Single protein structure of sequence from Pseudomonas syringae pv. phaseolicola. Full crystallographic information is available from OCA.
Reference
Crystal structures of the type III effector protein AvrPphF and its chaperone reveal residues required for plant pathogenesis., Singer AU, Desveaux D, Betts L, Chang JH, Nimchuk Z, Grant SR, Dangl JL, Sondek J, Structure. 2004 Sep;12(9):1669-81. PMID:15341731
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