Artículo

Casabuono, A.C.; Van Der Ploeg, C.A.; Rogé, A.D.; Bruno, S.B.; Couto, A.S. "Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide" (2012) Rapid Communications in Mass Spectrometry. 26(17):2011-2020
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Abstract:

RATIONALE In developing countries, Shigella flexneri (Sf) is the major causative agent of the endemic shigellosis (bacillary dysentery) responsible annually for one million fatalities mostly among infants. Lipopolysaccharides (LPSs) are characteristic components of the outer membrane of the overwhelming majority of Gram-negative bacteria. Since lipid A is essential for the viability of the Gram-negative bacteria, it is subject to extensive chemical studies with new analytical techniques. METHODS Lipid A was released by mild acid hydrolysis from the lipopolysaccharide which was obtained via the phenol/water extraction, purified and analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and matrix-assisted laser desorption/ionization laser-induced dissociation tandem mass spectrometry (MALDI-LID-MS/MS). RESULTS A detailed structural study of the whole lipid A obtained from S. flexneri variant X was carried out for the first time. Thus, we have shown that lipid A is a heterogeneous mixture having different numbers of acylated and phosphoethanolamine groups attached to the diglucosamine backbone. Furthermore, we found in the phenol phase an unusual hepta-acylated lipid A species, although the abundance was very low. CONCLUSIONS MALDI-TOF-MS allowed us to unravel the lipid A heterogeneity, which was not previously reported in Sf LPS. It is well known that slight variations of the chemical structure of lipid A may change its biological activity. Thus, the knowledge of the detailed chemical structure represents an essential step for further development of new preventive or therapeutically active compounds. Copyright © 2012 John Wiley & Sons, Ltd.

Registro:

Documento: Artículo
Título:Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide
Autor:Casabuono, A.C.; Van Der Ploeg, C.A.; Rogé, A.D.; Bruno, S.B.; Couto, A.S.
Filiación:CIHIDECAR, Departamento de Química Orgánica, 1428 Universidad de Buenos Aires, Cdad. Universitaria, Bs. As., Argentina
INPB, Administración Nacional de Laboratorios, Institutos de Salud, Dr. Carlos G. Malbran, Buenos Aires, Argentina
Palabras clave:lipid A; article; chemistry; conformation; mass spectrometry; Shigella flexneri; tandem mass spectrometry; Lipid A; Molecular Conformation; Shigella flexneri; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; Tandem Mass Spectrometry
Año:2012
Volumen:26
Número:17
Página de inicio:2011
Página de fin:2020
DOI: http://dx.doi.org/10.1002/rcm.6306
Título revista:Rapid Communications in Mass Spectrometry
Título revista abreviado:Rapid Commun. Mass Spectrom.
ISSN:09514198
CODEN:RCMSE
CAS:lipid A, 95991-05-2; Lipid A
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09514198_v26_n17_p2011_Casabuono

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Citas:

---------- APA ----------
Casabuono, A.C., Van Der Ploeg, C.A., Rogé, A.D., Bruno, S.B. & Couto, A.S. (2012) . Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide. Rapid Communications in Mass Spectrometry, 26(17), 2011-2020.
http://dx.doi.org/10.1002/rcm.6306
---------- CHICAGO ----------
Casabuono, A.C., Van Der Ploeg, C.A., Rogé, A.D., Bruno, S.B., Couto, A.S. "Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide" . Rapid Communications in Mass Spectrometry 26, no. 17 (2012) : 2011-2020.
http://dx.doi.org/10.1002/rcm.6306
---------- MLA ----------
Casabuono, A.C., Van Der Ploeg, C.A., Rogé, A.D., Bruno, S.B., Couto, A.S. "Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide" . Rapid Communications in Mass Spectrometry, vol. 26, no. 17, 2012, pp. 2011-2020.
http://dx.doi.org/10.1002/rcm.6306
---------- VANCOUVER ----------
Casabuono, A.C., Van Der Ploeg, C.A., Rogé, A.D., Bruno, S.B., Couto, A.S. Characterization of lipid A profiles from Shigella flexneri variant X lipopolysaccharide. Rapid Commun. Mass Spectrom. 2012;26(17):2011-2020.
http://dx.doi.org/10.1002/rcm.6306