Lipopolysaccharide binding of an exchangeable apolipoprotein, apolipophorin III, from Galleria mellonella
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Cindy C. Pratt
Abstract
A new role of apolipophorin III (apoLp-III) as an immune activator has emerged recently. To gain insight into this novel function, the interaction of apoLp-III with lipopoly-saccharide (LPS) was investigated. ApoLp-III from Galleria mellonella was incubated with LPS from Escherichia coli O55:B5, and analyzed by non-denaturing polyacrylamide gel electrophoresis (PAGE). Protein staining showed that apoLp-III mobility was significantly reduced. In addition, silver and LPS fluorescent staining demonstrated that LPS mobility was increased upon incubation with apoLp-III. This result suggests association of apoLp-III with LPS. Sodium dodecyl sulfate (SDS) PAGE analysis showed decreased apoLp-III mobility upon LPS addition, indicative of LPS apoLp-III interaction in the presence of SDS. The unique tyrosine residue that resides in apoLp-III was used to provide additional evidence for LPS binding interaction. In the absence of LPS, apoLp-III tyrosine fluorescence was relatively low. However, LPS addition resulted in a progressive increase in the fluorescence intensity, indicating tertiary rearrangement in the environment of tyrosine 142 upon LPS interaction. Other well-characterized apoLp-IIIs were also examined for LPS binding. Manduca sexta, Bombyx mori and Locusta migratoria apoLp-III were all able to interact with LPS. The ability of apoLp-III to form complexes with LPS supports the proposed role of apoLp-III in innate immunity.
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© Walter de Gruyter
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Articles in the same Issue
- Hiroshi Maeda – 40 years of research
- Activation of the kallikrein-kinin system and release of new kinins through alternative cleavage of kininogens by microbial and human cell proteinases
- Molecular mechanism for activation and regulation of matrix metalloproteinases during bacterial infections and respiratory inflammation
- Role of bacterial proteases in pseudomonal and serratial keratitis
- Cysteine cathepsins in human cancer
- Secretory leukoprotease inhibitor and pulmonary surfactant serve as principal defenses against influenza A virus infection in the airway and chemical agents up-regulating their levels may have therapeutic potential
- Design of inhibitors against HIV, HTLV-I, and Plasmodium falciparum aspartic proteases
- Roles of Arg- and Lys-gingipains in coaggregation of Porphyromonas gingivalis: identification of its responsible molecules in translation products of rgpA, kgp, and hagA genes
- Coordinate expression of the Porphyromonas gingivalis lysine-specific gingipain proteinase, Kgp, arginine-specific gingipain proteinase, RgpA, and the heme/hemoglobin receptor, HmuR
- Genetic characterization of staphopain genes in Staphylococcus aureus
- Visualisation of tissue kallikrein, kininogen and kinin receptors in human skin following trauma and in dermal diseases
- Reduction of myocardial infarction by calpain inhibitors A-705239 and A-705253 in isolated perfused rabbit hearts
- A proteinase inhibitor from Caesalpinia echinata (pau-brasil) seeds for plasma kallikrein, plasmin and factor XIIa
- Plasma prekallikrein/kallikrein processing by lysosomal cysteine proteases
- Characteristics of the caspase-like catalytic domain of human paracaspase
- mRNA expression analysis of a variety of apoptosis-related genes, including the novel gene of the BCL2-family, BCL2L12, in HL-60 leukemia cells after treatment with carboplatin and doxorubicin
- Thermoplasma acidophilum TAA43 is an archaeal member of the eukaryotic meiotic branch of AAA ATPases
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