2r25

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{{STRUCTURE_2r25| PDB=2r25 | SCENE= }}
{{STRUCTURE_2r25| PDB=2r25 | SCENE= }}
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'''Complex of YPD1 and SLN1-R1 with bound Mg2+ and BeF3-'''
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===Complex of YPD1 and SLN1-R1 with bound Mg2+ and BeF3-===
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==Overview==
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The crystal structure of the yeast SLN1 response regulator (RR) domain bound to both a phosphoryl analog [beryllium fluoride (BeF(3)(-))] and Mg(2+), in complex with its downstream phosphorelay signaling partner YPD1, has been determined at a resolution of 1.70 A. Comparisons between the BeF(3)(-)-activated complex and the unliganded (or apo) complex determined previously reveal modest but important differences. The SLN1-R1 x Mg(2+) x BeF(3)(-) structure from the complex provides evidence for the first time that the mechanism of phosphorylation-induced activation is highly conserved between bacterial RR domains and this example from a eukaryotic organism. Residues in and around the active site undergo slight rearrangements in order to form bonds with the essential divalent cation and fluorine atoms of BeF(3)(-). Two conserved switch-like residues (Thr1173 and Phe1192) occupy distinctly different positions in the apo versus BeF(3)(-)-bound structures, consistent with the "Y-T" coupling mechanism proposed for the activation of CheY and other bacterial RRs. Several loop regions and the alpha 4-beta 5-alpha 5 surface of the SLN1-R1 domain undergo subtle conformational changes ( approximately 1-3 A displacements relative to the apo structure) that lead to significant changes in terms of contacts that are formed with YPD1. Detailed structural comparisons of protein-protein interactions in the apo and BeF(3)(-)-bound complexes suggest at least a two-state equilibrium model for the formation of a transient encounter complex, in which phosphorylation of the RR promotes the formation of a phosphotransfer-competent complex. In the BeF(3)(-)-activated complex, the position of His64 from YPD1 needs to be within ideal distance of and in near-linear geometry with Asp1144 from the SLN1-R1 domain for phosphotransfer to occur. The ground-state structure presented here suggests that phosphoryl transfer will likely proceed through an associative mechanism involving the formation of a pentacoordinate phosphorus intermediate.
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{{ABSTRACT_PUBMED_18076904}}
==About this Structure==
==About this Structure==
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[[Category: Transmembrane]]
[[Category: Transmembrane]]
[[Category: Two-component regulatory system]]
[[Category: Two-component regulatory system]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 16:06:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:40:41 2008''

Revision as of 14:40, 27 July 2008

Image:2r25.png

Template:STRUCTURE 2r25

Complex of YPD1 and SLN1-R1 with bound Mg2+ and BeF3-

Template:ABSTRACT PUBMED 18076904

About this Structure

2R25 is a Protein complex structure of sequences from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Crystal structure of a complex between the phosphorelay protein YPD1 and the response regulator domain of SLN1 bound to a phosphoryl analog., Zhao X, Copeland DM, Soares AS, West AH, J Mol Biol. 2008 Jan 25;375(4):1141-51. Epub 2007 Nov 22. PMID:18076904

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