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NMR structure of rALF-Pm3, an anti-lipopolysaccharide factor from shrimp: model of the possible lipid A-binding site Inra
Yang, Y.; Boze, H.; Chemardin, P.; Padilla, A.; Moulin, G.; Tassanakajon, A.; Pugnière, M.; Roquet, F.; Destoumieux-Garzon, D.; Gueguen, Y.; Bachère, E.; Aumelas, A..
The anti-lipopolysaccharide factor ALF-Pm3 is a 98-residue protein identified in hemocytes from the black tiger shrimp Penaeus monodon. It was expressed in Pichia pastoris from the constitutive glyceraldehyde-3-phosphate dehydrogenase promoter as a folded and N-15 uniformly labeled rALF-Pm3 protein. Its 3D structure was established by NMR and consists of three alpha-helices packed against a four-stranded beta-sheet. The C-34-C-55 disulfide bond was shown to be essential for the structure stability. By using surface plasmon resonance, we demonstrated that rALF-Pm3 binds to LPS, lipid A and to OM(R)-174, a soluble analogue of lipid A. Biophysical studies of rALF-Pm3/LPS and rALF-Pm3/OM(R)-174 complexes indicated rather high molecular sized aggregates, which...
Tipo: Journal Article Palavras-chave: ANTI-LIPOPOLYSACCHARIDE FACTOR ; LIPOPOLYSACCHARIDE; LIPID A; NMR; STRUCTURE; SEPTIC SHOCK; SURFACE PLASMON RESONANCE ULTRACENTRIFUGATION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201064bb8a78&uri=/notices/prodinra1/2010/09/
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Spodoptera frugiperda X-tox protein, an immune related defensin rosary, has lost the function ancestral defensins Inra
Destoumieux-Garzon, D.; Brehélin, M.; Bulet, B.; Boublik, Y.; Girard, P.A.; Baghdiguian, S.; Zumbihl, R.; Escoubas, J.M..
Background: X-tox proteins are a family of immune-related proteins only found in Lepidoptera and characterized by imperfectly conserved tandem repeats of several defensin-like motifs. Previous phylogenetic analysis of X-tox genes supported the hypothesis that X-tox have evolved from defensins in a lineage-specific gene evolution restricted to Lepidoptera. In this paper, we performed a protein study in which we asked whether X-tox proteins have conserved the antimicrobial functions of their ancestral defensins and have evolved as defensin reservoirs.Methodology/Principal Findings: We followed the outcome of Spod-11-tox, an X-tox protein characterized in Spodoptera frugiperda, in bacteria-challenged larvae using both immunochemistry and antimicrobial assays....
Tipo: Journal Article Palavras-chave: LEPIDOPTERE X-TOX PROTEIN; LEPIDOPTERA; IMMUNE-RELATED PROTEIN; ANCESTRAL DEFENSINS; SPODOPTERA FRUGIPERDA.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201095cf8004&uri=/notices/prodinra1/2010/10/
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