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Yuriy A. Knirel - One of the best experts on this subject based on the ideXlab platform.
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Structure of the O-polysaccharide of Citrobacter youngae PCM 1503
Carbohydrate Research, 2010Co-Authors: Nina A. Kocharova, Alexander S Shashkov, Ewa Katzenellenbogen, George V. Zatonsky, Andrzej Gamian, Ewa Brzozowska, Yuriy A. KnirelAbstract:The O-polysaccharide (O-antigen) was obtained from the lipopolysaccharide of Citrobacter youngae PCM 1503, which is currently classified to the O7 serogroup. The following structure of the tetrasaccharide repeating unit of the polysaccharide was established by sugar and methylation analyses along with 1D and 2D 1H and 13C NMR spectroscopy: Figure options Download full-size image Download as Powerpoint Slide Structural and serological data of the O-antigen suggest that strain PCM 1503 should be reclassified to a new Citrobacter serogroup.
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Revision of the O-polysaccharide structure of Yersinia pseudotuberculosis O:1b
Carbohydrate Research, 2009Co-Authors: Anna N. Kondakova, Alexander S Shashkov, Rima Z. Shaikhutdinova, Sergey A. Ivanov, Svetlana V. Dentovskaya, Andrey P. Anisimov, Yuriy A. KnirelAbstract:The O-polysaccharide of Yersinia pseudotuberculosis O:1b was reinvestigated using 1H and 13C NMR spectroscopy, and the anomeric configuration of the mannose residue at the branching point was revised. The following is the revised structure of the O-polysaccharide: Figure options Download full-size image Download as Powerpoint Slide where Par stands for 3,6-dideoxy-d-ribo-hexose (paratose). The revised structure of the main chain is shared by the O-polysaccharide of Y. pseudotuberculosis O:11, which differs in the presence of a lateral α-l-6-deoxyaltrofuranose residue in place of the β-paratofuranose residue [Cunneen, M. M.; de Castro, C.; Kenyon, J.; Parrilli, M.; Reeves, P. R.; Molinaro, A.; Holst, O.; Skurnik, M. Carbohydr. Res.2009, 344, 1533–1540].
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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structure of a new acidic o antigen of proteus vulgaris o22 containing o acetylated 3 acetamido 3 6 dideoxy d glucose
Carbohydrate Research, 1999Co-Authors: Filip V Toukach, Antoni Rozalski, Marianna Wykrota, Alexander S Shashkov, Beata Bartodziejska, Sofya N Senchenkova, Yuriy A. KnirelAbstract:The acidic O-specific polysaccharide of Proteusvulgaris O22 was studied using 1H and 13C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, and H-detected 1H,13C heteronuclear multiple-quantum coherence (HMQC) experiments, and the following structure for the branched pentasaccharide repeating unit was established: Figure options Download full-size image Download as Powerpoint Slide where Qui3NAc is 3-acetamido-3,6-dideoxyglucose, O-acetylation of QuiNAc at position 4 is stoichiometric and at position 2 nonstoichiometric. Serological relationships of P. vulgaris O22 with some other Proteus strains were substantiated on the level of the O-antigen structures.
Antoni Rozalski - One of the best experts on this subject based on the ideXlab platform.
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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structure of a new acidic o antigen of proteus vulgaris o22 containing o acetylated 3 acetamido 3 6 dideoxy d glucose
Carbohydrate Research, 1999Co-Authors: Filip V Toukach, Antoni Rozalski, Marianna Wykrota, Alexander S Shashkov, Beata Bartodziejska, Sofya N Senchenkova, Yuriy A. KnirelAbstract:The acidic O-specific polysaccharide of Proteusvulgaris O22 was studied using 1H and 13C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, and H-detected 1H,13C heteronuclear multiple-quantum coherence (HMQC) experiments, and the following structure for the branched pentasaccharide repeating unit was established: Figure options Download full-size image Download as Powerpoint Slide where Qui3NAc is 3-acetamido-3,6-dideoxyglucose, O-acetylation of QuiNAc at position 4 is stoichiometric and at position 2 nonstoichiometric. Serological relationships of P. vulgaris O22 with some other Proteus strains were substantiated on the level of the O-antigen structures.
Fereshteh Azimian - One of the best experts on this subject based on the ideXlab platform.
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Recent developments of the Stille reaction as a revolutionized method in total synthesis
Tetrahedron, 2014Co-Authors: Mohammad Momen Heravi, Elaheh Hashemi, Fereshteh AzimianAbstract:In this review, a number of recent and selected applications of the Stille reaction in the total synthesis of natural products is discussed. Figure options Download full-size image Download as Powerpoint Slide
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recent developments of the stille reaction as a revolutionized method in total synthesis
Tetrahedron, 2014Co-Authors: Mohammad Momen Heravi, Elaheh Hashemi, Fereshteh AzimianAbstract:In this review, a number of recent and selected applications of the Stille reaction in the total synthesis of natural products is discussed.
Figure options Download full-size image Download as Powerpoint Slide
Alexander S Shashkov - One of the best experts on this subject based on the ideXlab platform.
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Structure of the O-polysaccharide of Citrobacter youngae PCM 1503
Carbohydrate Research, 2010Co-Authors: Nina A. Kocharova, Alexander S Shashkov, Ewa Katzenellenbogen, George V. Zatonsky, Andrzej Gamian, Ewa Brzozowska, Yuriy A. KnirelAbstract:The O-polysaccharide (O-antigen) was obtained from the lipopolysaccharide of Citrobacter youngae PCM 1503, which is currently classified to the O7 serogroup. The following structure of the tetrasaccharide repeating unit of the polysaccharide was established by sugar and methylation analyses along with 1D and 2D 1H and 13C NMR spectroscopy: Figure options Download full-size image Download as Powerpoint Slide Structural and serological data of the O-antigen suggest that strain PCM 1503 should be reclassified to a new Citrobacter serogroup.
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Revision of the O-polysaccharide structure of Yersinia pseudotuberculosis O:1b
Carbohydrate Research, 2009Co-Authors: Anna N. Kondakova, Alexander S Shashkov, Rima Z. Shaikhutdinova, Sergey A. Ivanov, Svetlana V. Dentovskaya, Andrey P. Anisimov, Yuriy A. KnirelAbstract:The O-polysaccharide of Yersinia pseudotuberculosis O:1b was reinvestigated using 1H and 13C NMR spectroscopy, and the anomeric configuration of the mannose residue at the branching point was revised. The following is the revised structure of the O-polysaccharide: Figure options Download full-size image Download as Powerpoint Slide where Par stands for 3,6-dideoxy-d-ribo-hexose (paratose). The revised structure of the main chain is shared by the O-polysaccharide of Y. pseudotuberculosis O:11, which differs in the presence of a lateral α-l-6-deoxyaltrofuranose residue in place of the β-paratofuranose residue [Cunneen, M. M.; de Castro, C.; Kenyon, J.; Parrilli, M.; Reeves, P. R.; Molinaro, A.; Holst, O.; Skurnik, M. Carbohydr. Res.2009, 344, 1533–1540].
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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New structure for the O-polysaccharide of Providencia alcalifaciens O27 and revised structure for the O-polysaccharide of Providencia stuartii O43
Carbohydrate Research, 2007Co-Authors: Olga G Ovchinnikova, Marianna Wykrota, Ivan S Bushmarinov, Nina A. Kocharova, Yuriy A. Knirel, Filip V Toukach, Alexander S Shashkov, Antoni RozalskiAbstract:The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide from Providencia alcalifaciens O27 and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including 2D 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC, and HMBC experiments. It was found that the polysaccharide is built up of linear partially O-acetylated tetrasaccharide repeating units and has the following structure: Figure options Download full-size image Download as Powerpoint Slide where Qui4NFo stands for 4-formamido-4,6-dideoxyglucose (4-formamido-4-deoxyquinovose). The O-polysaccharide structure of Providencia stuartii O43 established earlier was revised with respect to the configuration of the constituent 4-amino-4,6-dideoxyhexose (from Rha4N to Qui4N).
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structure of a new acidic o antigen of proteus vulgaris o22 containing o acetylated 3 acetamido 3 6 dideoxy d glucose
Carbohydrate Research, 1999Co-Authors: Filip V Toukach, Antoni Rozalski, Marianna Wykrota, Alexander S Shashkov, Beata Bartodziejska, Sofya N Senchenkova, Yuriy A. KnirelAbstract:The acidic O-specific polysaccharide of Proteusvulgaris O22 was studied using 1H and 13C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, and H-detected 1H,13C heteronuclear multiple-quantum coherence (HMQC) experiments, and the following structure for the branched pentasaccharide repeating unit was established: Figure options Download full-size image Download as Powerpoint Slide where Qui3NAc is 3-acetamido-3,6-dideoxyglucose, O-acetylation of QuiNAc at position 4 is stoichiometric and at position 2 nonstoichiometric. Serological relationships of P. vulgaris O22 with some other Proteus strains were substantiated on the level of the O-antigen structures.
Andrzej Gamian - One of the best experts on this subject based on the ideXlab platform.
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Structure of the O-polysaccharide of Citrobacter youngae PCM 1503
Carbohydrate Research, 2010Co-Authors: Nina A. Kocharova, Alexander S Shashkov, Ewa Katzenellenbogen, George V. Zatonsky, Andrzej Gamian, Ewa Brzozowska, Yuriy A. KnirelAbstract:The O-polysaccharide (O-antigen) was obtained from the lipopolysaccharide of Citrobacter youngae PCM 1503, which is currently classified to the O7 serogroup. The following structure of the tetrasaccharide repeating unit of the polysaccharide was established by sugar and methylation analyses along with 1D and 2D 1H and 13C NMR spectroscopy: Figure options Download full-size image Download as Powerpoint Slide Structural and serological data of the O-antigen suggest that strain PCM 1503 should be reclassified to a new Citrobacter serogroup.
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structure and serological analysis of the hafnia alvei 481 l o specific polysaccharide containing phosphate in the backbone chain
Carbohydrate Research, 2006Co-Authors: Joanna Kublerkielb, Andrzej Gamian, Evgueny Vinogradov, J Garcia M Fernandez, Bernadeta Szostko, A ZwiefkaAbstract:The lipopolysaccharide was extracted from cells of Hafnia alvei 481-L bacterial strain and, after mild acid hydrolysis, the O-specific polysaccharide was isolated and characterised. On the basis of chemical analyses and NMR spectroscopic studies of the polysaccharide and oligosaccharides obtained after Smith degradation, or hydrogen fluoride treatment, it was found that the repeating unit of the O-specific polysaccharide is a phosphorylated hexasaccharide: Figure options Download full-size image Download as Powerpoint Slide The biological repeating unit of the H. alvei 481-L O-antigen has galactose phosphate at the nonreducing terminus. Serological tests indicate that this strain represents an individual serotype in the H. alvei genus.
