1kmi: Difference between revisions

Revision as of 07:30, 25 December 2014

CRYSTAL STRUCTURE OF AN E.COLI CHEMOTAXIS PROTEIN, CHEZ

Structural highlights

1kmi is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	BCN, BEF, MG
Related:	1fqw, 1f4v
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[CHEY_ECOLI] Involved in the transmission of sensory signals from the chemoreceptors to the flagellar motors. In its active (phosphorylated or acetylated) form, CheY exhibits enhanced binding to a switch component, FliM, at the flagellar motor which induces a change from counterclockwise to clockwise flagellar rotation. Overexpression of CheY in association with MotA and MotB improves motility of a ycgR disruption, suggesting there is an interaction (direct or indirect) between the c-di-GMP-binding flagellar brake protein and the flagellar stator.^[1] [CHEZ_ECOLI] Plays an important role in bacterial chemotaxis signal transduction pathway by accelerating the dephosphorylation of phosphorylated CheY (CheY-P).^[2] ^[3]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The protein CheZ, which has the last unknown structure in the Escherichia coli chemotaxis pathway, stimulates the dephosphorylation of the response regulator CheY by an unknown mechanism. Here we report the co-crystal structure of CheZ with CheY, Mg(2+) and the phosphoryl analog, BeF(3)(-). The predominant structural feature of the CheZ dimer is a long four-helix bundle composed of two helices from each monomer. The side chain of Gln 147 of CheZ inserts into the CheY active site and is essential to the dephosphorylation activity of CheZ. Gln 147 may orient a water molecule for nucleophilic attack, similar to the role of the conserved Gln residue in the RAS family of GTPases. Similarities between the CheY[bond] CheZ and Spo0F [bond]Spo0B structures suggest a general mode of interaction for modulation of response regulator phosphorylation chemistry.

Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ.,Zhao R, Collins EJ, Bourret RB, Silversmith RE Nat Struct Biol. 2002 Aug;9(8):570-5. PMID:12080332^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Paul K, Nieto V, Carlquist WC, Blair DF, Harshey RM. The c-di-GMP binding protein YcgR controls flagellar motor direction and speed to affect chemotaxis by a "backstop brake" mechanism. Mol Cell. 2010 Apr 9;38(1):128-39. doi: 10.1016/j.molcel.2010.03.001. Epub 2010, Mar 25. PMID:20346719 doi:10.1016/j.molcel.2010.03.001
↑ Wang H, Matsumura P. Characterization of the CheAS/CheZ complex: a specific interaction resulting in enhanced dephosphorylating activity on CheY-phosphate. Mol Microbiol. 1996 Feb;19(4):695-703. PMID:8820640
↑ Boesch KC, Silversmith RE, Bourret RB. Isolation and characterization of nonchemotactic CheZ mutants of Escherichia coli. J Bacteriol. 2000 Jun;182(12):3544-52. PMID:10852888
↑ Zhao R, Collins EJ, Bourret RB, Silversmith RE. Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ. Nat Struct Biol. 2002 Aug;9(8):570-5. PMID:12080332 doi:10.1038/nsb816

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OCA

[1] Paul K, Nieto V, Carlquist WC, Blair DF, Harshey RM. The c-di-GMP binding protein YcgR controls flagellar motor direction and speed to affect chemotaxis by a "backstop brake" mechanism. Mol Cell. 2010 Apr 9;38(1):128-39. doi: 10.1016/j.molcel.2010.03.001. Epub 2010, Mar 25. PMID:20346719 doi:10.1016/j.molcel.2010.03.001

[2] Wang H, Matsumura P. Characterization of the CheAS/CheZ complex: a specific interaction resulting in enhanced dephosphorylating activity on CheY-phosphate. Mol Microbiol. 1996 Feb;19(4):695-703. PMID:8820640

[3] Boesch KC, Silversmith RE, Bourret RB. Isolation and characterization of nonchemotactic CheZ mutants of Escherichia coli. J Bacteriol. 2000 Jun;182(12):3544-52. PMID:10852888

[4] Zhao R, Collins EJ, Bourret RB, Silversmith RE. Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ. Nat Struct Biol. 2002 Aug;9(8):570-5. PMID:12080332 doi:10.1038/nsb816

[1]

[2]

[3]

[4]

@@ Line 3: / Line 3: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1kmi]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KMI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1KMI FirstGlance]. <br>
-</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BCN:BICINE'>BCN</scene>, <scene name='pdbligand=BEF:BERYLLIUM+TRIFLUORIDE+ION'>BEF</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene><br>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BCN:BICINE'>BCN</scene>, <scene name='pdbligand=BEF:BERYLLIUM+TRIFLUORIDE+ION'>BEF</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
-<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1fqw|1fqw]], [[1f4v|1f4v]]</td></tr>
+<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1fqw|1fqw]], [[1f4v|1f4v]]</td></tr>
-<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kmi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kmi OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1kmi RCSB], [http://www.ebi.ac.uk/pdbsum/1kmi PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kmi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kmi OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1kmi RCSB], [http://www.ebi.ac.uk/pdbsum/1kmi PDBsum]</span></td></tr>
-<table>
+</table>
+== Function ==
+[[http://www.uniprot.org/uniprot/CHEY_ECOLI CHEY_ECOLI]] Involved in the transmission of sensory signals from the chemoreceptors to the flagellar motors. In its active (phosphorylated or acetylated) form, CheY exhibits enhanced binding to a switch component, FliM, at the flagellar motor which induces a change from counterclockwise to clockwise flagellar rotation. Overexpression of CheY in association with MotA and MotB improves motility of a ycgR disruption, suggesting there is an interaction (direct or indirect) between the c-di-GMP-binding flagellar brake protein and the flagellar stator.<ref>PMID:20346719</ref>  [[http://www.uniprot.org/uniprot/CHEZ_ECOLI CHEZ_ECOLI]] Plays an important role in bacterial chemotaxis signal transduction pathway by accelerating the dephosphorylation of phosphorylated CheY (CheY-P).<ref>PMID:8820640</ref> <ref>PMID:10852888</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 33: / Line 35: @@
 </StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Bourret, R B.]]
+[[Category: Bourret, R B]]
-[[Category: Collins, E J.]]
+[[Category: Collins, E J]]
-[[Category: Silversmith, R E.]]
+[[Category: Silversmith, R E]]
-[[Category: Zhao, R.]]
+[[Category: Zhao, R]]
 [[Category: Four-helix bundle]]
 [[Category: Signaling protein]]

1kmi: Difference between revisions

Revision as of 07:30, 25 December 2014

CRYSTAL STRUCTURE OF AN E.COLI CHEMOTAXIS PROTEIN, CHEZ

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

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