Photorhabdus luminescens lectin A (PllA) - a new probe for detecting α-galactoside-terminating glycoconjugates.
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Authors
Beshr, GhamdanSikandar, Asfandyar
Jemiller, Eva-Maria
Klymiuk, Nikolai
Hauck, Dirk
Wagner, Stefanie
Wolf, Eckhard
Koehnke, Jesko
Titz, Alexander

Issue Date
2017-09-28
Metadata
Show full item recordAbstract
Lectins play important roles in infections by pathogenic bacteria, for example, in host colonization, persistence and biofilm formation. The Gram-negative entomopathogenic bacterium Photorhabdus luminescens symbiotically lives in insect-infecting Heterorhabditis nematodes and kills the insect host upon invasion by the nematode. The P. luminescens genome harbors the gene plu2096 coding for a novel lectin that we named PllA. We analyzed the binding properties of purified PllA with a glycan array and a binding assay in solution. Both assays revealed a strict specificity of PllA for alpha-galactoside-terminating glycoconjugates. The crystal structures of apo PllA and complexes with three different ligands revealed the molecular basis for the strict specificity of this lectin. Furthermore, we found that a 90 degree twist in subunit orientation leads to a peculiar quaternary structure compared with that of its ortholog LecA from Pseudomonas aeruginosa. We also investigated the utility of PllA as a probe for detecting alpha-galactosides. The alpha-Gal epitope is present on wild-type pig cells and the main reason for hyperacute organ rejection in pig to primate xenotransplantation. We noted that PllA specifically recognizes this epitope on the glycan array and demonstrated that PllA can be used as a fluorescent probe to detect this epitope on primary porcine cells in vitro. In summary, our biochemical and structural analyses of the P. luminescens lectin PllA have disclosed the structural basis for PllAs high specificity for alpha-galactoside-containing ligands, and we show that PllA can be used to visualize alpha-Gal epitope on porcine tissues.Citation
Photorhabdus luminescens lectin A (PllA) - a new probe for detecting α-galactoside-terminating glycoconjugates. 2017 J. Biol. Chem.Affiliation
Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Universitycampus E8.1, 66123 Saarbrücken, Germany.PubMed ID
28972138Type
ArticleLanguage
enISSN
1083-351Xae974a485f413a2113503eed53cd6c53
10.1074/jbc.M117.812792
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- Creative Commons
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-sa/4.0/
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