Oulavallickal T, Brewster JL, McKellar JLO, Fairhurst MJ, Tenci NA, Gerth ML. The Pseudomonas syringae pv. actinidiae chemoreceptor protein F (PscF) periplasmic sensor domain: cloning, purification and X-ray crystallographic analysis.
Acta Crystallogr F Struct Biol Commun 2017;
73:701-705. [PMID:
29199992 PMCID:
PMC5713676 DOI:
10.1107/s2053230x17016831]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 11/21/2017] [Indexed: 02/02/2023] Open
Abstract
Nitrate- and nitrite-sensing (NIT) domains are found associated with a wide variety of bacterial receptors, including chemoreceptors. However, the structure of a chemoreceptor-associated NIT domain has not yet been characterized. Recently, a chemoreceptor named PscF was identified from the plant pathogen Pseudomonas syringae pv. actinidiae that is predicted to contain a periplasmic NIT domain. The PscF sensor domain (PscF-SD; residues 42-332) was cloned into an appropriate expression vector, recombinantly produced in Escherichia coli BL21-Gold(DE3) cells and purified via immobilized metal-affinity and size-exclusion chromatography. Purified PscF-SD was screened for crystallization; the best crystal diffracted to a maximum resolution of 1.46 Å in space group P212121. However, the data could not be phased using the only available NIT-domain structure (Klebsiella oxytoca NasR; PDB entry 4akk) as the search model. Therefore, a data set from a selenomethionine-labelled protein crystal was also collected. The selenomethionine-labelled protein crystal diffracted to a resolution of 2.46 Å in space group P212121. These data will be used to attempt to solve the structure using the single-wavelength anomalous diffraction technique. The structure is expected to provide insights into the ligand specificity of NIT domains and the role of NIT domains in chemotaxis.
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