1p6u: Difference between revisions
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'''NMR structure of the BeF3-activated structure of the response regulator Chey2-Mg2+ from Sinorhizobium meliloti''' | '''NMR structure of the BeF3-activated structure of the response regulator Chey2-Mg2+ from Sinorhizobium meliloti''' | ||
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[[Category: Scharf, B.]] | [[Category: Scharf, B.]] | ||
[[Category: Schmitt, R.]] | [[Category: Schmitt, R.]] | ||
[[Category: | [[Category: Activation]] | ||
[[Category: | [[Category: Chemotaxis]] | ||
[[Category: | [[Category: Chey2 beryllium fluoride]] | ||
[[Category: | [[Category: Response regulator]] | ||
[[Category: | [[Category: Signal transduction]] | ||
[[Category: | [[Category: Spine]] | ||
[[Category: | [[Category: Structural genomic]] | ||
[[Category: | [[Category: Structural proteomics in europe]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Apr 13 08:09:26 2008'' | |||
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Revision as of 05:09, 13 April 2008
NMR structure of the BeF3-activated structure of the response regulator Chey2-Mg2+ from Sinorhizobium meliloti
Overview
The chemotactic signalling chain to the flagellar motor of Sinorhizobium meliloti features a new type of response regulator, CheY2. CheY2 activated by phosphorylation (CheY2-P) controls the rotary speed of the flagellar motor (instead of reversing the sense of rotation), and it is efficiently dephosphorylated by phospho-retrotransfer to the cognate kinase, CheA. Here, we report the NMR solution structures of the Mg(2+)-complex of inactive CheY2, and of activated CheY2-BeF(3), a stable analogue of CheY2-P, to an overall root mean square deviation of 0.042 nm and 0.027 nm, respectively. The 14 kDa CheY2 protein exhibits a characteristic open (alpha/beta)(5) conformation. Modification of CheY2 by BeF(3)(-) leads to large conformational changes of the protein, which are in the limits of error identical with those observed by phosphorylation of the active-centre residue Asp58. In BeF(3)-activated CheY2, the position of Thr88-OH favours the formation of a hydrogen bond with the active site, Asp58-BeF(3), similar to BeF(3)-activated CheY from Escherichia coli. In contrast to E.coli, this reorientation is not involved in a Tyr-Thr-coupling mechanism, that propagates the signal from the incoming phosphoryl group to the C-terminally located FliM-binding surface. Rather, a rearrangement of the Phe59 side-chain to interact with Ile86-Leu95-Val96 along with a displacement of alpha4 towards beta5 is stabilised in S.meliloti. The resulting, activation-induced, compact alpha4-beta5-alpha5 surface forms a unique binding domain suited for specific interaction with and signalling to a rotary motor that requires a gradual speed control. We propose that these new features of response regulator activation, compared to other two-component systems, are the key for the observed unique phosphorylation, dephosphorylation and motor control mechanisms in S.meliloti.
About this Structure
1P6U is a Single protein structure of sequence from Sinorhizobium meliloti. Full crystallographic information is available from OCA.
Reference
Solution structures of the inactive and BeF3-activated response regulator CheY2., Riepl H, Scharf B, Schmitt R, Kalbitzer HR, Maurer T, J Mol Biol. 2004 Apr 23;338(2):287-97. PMID:15066432 Page seeded by OCA on Sun Apr 13 08:09:26 2008
