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Characterization of homologous sphingosine-1-phosphate lyase isoforms in the bacterial pathogen Burkholderia pseudomallei

Lookup NU author(s): Dr Jon Marles-Wright

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Sphingolipids (SLs) are ubiquitous elements in eukaryotic membranes and are also found in some bacterial and viral species. As well as playing an integral structural role, SLs also act as potent signaling molecules involved in numerous cellular pathways and have been linked to many human diseases. A central SL signaling molecule is sphingosine-1-phosphate (S1P), whose breakdown is catalyzed by S1P lyase (S1PL), a pyridoxal 5′-phosphate (PLP)-dependent enzyme that catalyzes the cleavage of S1P to (2E)-hexadecenal (2E-HEX) and phosphoethanolamine. Here, we show that the pathogenic bacterium, Burkholderia pseudomallei K96243, encodes two homologous proteins (S1PL2021 and S1PL2025) that display moderate sequence identity to known eukaryotic and prokaryotic S1PLs. Using an established MS-based methodology, we show that recombinant S1PL2021 is catalytically active. We also used recombinant human fatty aldehyde dehydrogenase to develop a spectrophotometric enzyme-coupled assay to detect 2E-HEX formation and measure the kinetic constants of the two B. pseudomallei S1PL isoforms. Furthermore, we determined the X-ray crystal structure of the PLP-bound form of S1PL2021 at 2.1 Å resolution revealing that the enzyme displays a conserved structural fold and active site architecture comparable with known S1PLs. The combined data suggest that B. pseudomallei has the potential to degrade host SLs in a S1PL-dependent manner.


Publication metadata

Author(s): McLean CJ, Marles-Wright J, Custodio R, Lowther J, Kennedy AJ, Pollock J, Clarke DJ, Brown AR, Campopiano DJ

Publication type: Article

Publication status: Published

Journal: Journal of Lipid Research

Year: 2017

Volume: 58

Pages: 137-150

Print publication date: 16/01/2017

Online publication date: 26/10/2016

Acceptance date: 26/10/2016

Date deposited: 10/03/2017

ISSN (print): 0022-2275

ISSN (electronic): 1539-7262

Publisher: American Society for Biochemistry and Molecular Biology, Inc.

URL: https://doi.org/10.1194/jlr.M071258

DOI: 10.1194/jlr.M071258

PubMed id: 27784725


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