1KMI

CRYSTAL STRUCTURE OF AN E.COLI CHEMOTAXIS PROTEIN, CHEZ

Summary for 1KMI

• Entry DOI: 10.2210/pdb1kmi/pdb
• Related: 1F4V 1FQW
• Descriptor: Chemotaxis protein cheY, Chemotaxis protein cheZ, MAGNESIUM ION, ... (5 entities in total)
• Functional Keywords: four-helix bundle, signaling protein
• Biological source: Escherichia coli; More
• Cellular location: Cytoplasm: P06143 P0A9H9
• Total number of polymer chains: 2
• Total formula weight: 38364.85

Authors

Zhao, R.,Collins, E.J.,Bourret, R.B.,Silversmith, R.E. (deposition date: 2001-12-16, release date: 2002-07-24, Last modification date: 2023-08-16)

Primary citation

Zhao, R.,Collins, E.J.,Bourret, R.B.,Silversmith, R.E.
Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ.
Nat.Struct.Biol., 9:570-575, 2002

PubMed Abstract: 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.

PubMed: 12080332

Experimental method

X-RAY DIFFRACTION (2.9 Å)