Found 3 records.
Displayed records from 1 to 3
Expand all records
Collapse all records
Show all as text (SweetDB notation)
Show all graphically (SNFG notation)
Becker A, Puhler A
Production of exopolysaccharides
Book: The Rhizobiaceae. Molecular Biology of Model Plant-Associated Bacteria (1998)
Chapter 6, 97-118
|
b-D-GlcpA4Me-(1-3)-+
|
-4)-b-L-Rhap-(1-3)-b-L-Rhap-(1-4)-a-L-Rhap-(1- |
Show graphically |
Bradyrhizobium elkanii
(NCBI TaxID 29448,
species name lookup)
Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
WWW link: https://link.springer.com/chapter/10.1007/978-94-011-5060-6_6Publisher: Dordrecht: Kluwer Academic Publishers
Editors: Spaink HP, Kondorosi A, Hooykaas PJJ
Correspondence: hippo
genetik.uni-bielefeld.de
Institutions: Lehrstuhl für Genetik, Fakultät für Biologie, Universität Bielefeld, Germany
A broad variety of bacteria including the Rhizobiaceae are able to secrete polysaccharides. Sugar polymers that form an adherent cohesive layer on the cell surface are designated capsular polysacharides (CPS), whereas the term exopolysaccharide (EPS) is used for polysaccharides with little or no cell association. Due to the variation of monosaccharide sequences, condensation linkages and non-carbohydrate decorations, an infinite array of structures can be provided by this class of macromolecules. Different rheological properties depend on the structure and the molecular weight of EPS. These properties and the location of EPS, forming the outer layer of the cell surface, contribute to the cell protection against environmental influences, attachment to surfaces, nutrient gathering and to antigenicity (Costerton et al., 1987, Sutherland 1988, Whitfield 1988, Beveridge and Graham 1991). The structural diversity of oligosaccharides derived from EPS enables them to function additionally as informational molecules in cell-cell-communications. Finally, many symbiotic bacteria of the Rhizobiaceae use oligosaccharides as signal molecules in the interaction with their host plant.
glycosyl transferase, Indeterminate Nodule, Symbiotic Phenotype, Exopolysaccharide Biosynthesis, SU47 Mutant
Structure type: polymer chemical repeating unit
Location inside paper: p.101, fig.2, B. elkanii
Compound class: EPS, glucuronorhamnan, NPS
Contained glycoepitopes: IEDB_115136,IEDB_136105,IEDB_140630,IEDB_225177,IEDB_423153,IEDB_885823
Comments, role: review
Related record ID(s): 966, 1184, 1185, 1186, 1187, 1188, 1190, 1191
NCBI Taxonomy refs (TaxIDs): 29448Reference(s) to other database(s): GTC:G62876YX
Show glycosyltransferases
There is only one chemically distinct structure:
Expand this record
Collapse this record
Janczarek M
Environmental signals and regulatory pathways that influence exopolysaccharide production in Rhizobia
International Journal of Molecular Sciences 12(11) (2011)
7898-7933
|
b-D-GlcpA4Me-(1-3)-+
|
-4)-b-L-Rhap-(1-3)-b-L-Rhap-(1-4)-a-L-Rhap-(1- |
Show graphically |
Bradyrhizobium elkanii
(NCBI TaxID 29448,
species name lookup)
Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
NCBI PubMed ID: 22174640Publication DOI: 10.3390/ijms12117898Journal NLM ID: 101092791Publisher: Basel, Switzerland: MDPI
Correspondence: mon.jan
poczta.umcs.lublin.pl
Institutions: Department of Genetics and Microbiology, University of M. Curie-Skłodowska, Lublin, Poland
Rhizobia are Gram-negative bacteria that can exist either as free-living bacteria or as nitrogen-fixing symbionts inside root nodules of leguminous plants. The composition of the rhizobial outer surface, containing a variety of polysaccharides, plays a significant role in the adaptation of these bacteria in both habitats. Among rhizobial polymers, exopolysaccharide (EPS) is indispensable for the invasion of a great majority of host plants which form indeterminate-type nodules. Various functions are ascribed to this heteropolymer, including protection against environmental stress and host defense, attachment to abiotic and biotic surfaces, and in signaling. The synthesis of EPS in rhizobia is a multi-step process regulated by several proteins at both transcriptional and post-transcriptional levels. Also, some environmental factors (carbon source, nitrogen and phosphate starvation, flavonoids) and stress conditions (osmolarity, ionic strength) affect EPS production. This paper discusses the recent data concerning the function of the genes required for EPS synthesis and the regulation of this process by several environmental signals. Up till now, the synthesis of rhizobial EPS has been best studied in two species, Sinorhizobium meliloti and Rhizobium leguminosarum. The latest data indicate that EPS synthesis in rhizobia undergoes very complex hierarchical regulation, in which proteins engaged in quorum sensing and the regulation of motility genes also participate. This finding enables a better understanding of the complex processes occurring in the rhizosphere which are crucial for successful colonization and infection of host plant roots.
Rhizobium leguminosarum, Sinorhizobium meliloti, exopolysaccharide synthesis, motility, quorum sensing, exo and pss genes, rhizobium-legume symbiosis
Structure type: polymer chemical repeating unit
Location inside paper: Fig.1, structure H
Compound class: EPS, glucuronorhamnan, NPS
Contained glycoepitopes: IEDB_115136,IEDB_136105,IEDB_140630,IEDB_225177,IEDB_423153,IEDB_885823
Related record ID(s): 45674, 45675, 45676, 45677, 45678, 45679, 45680, 45682
NCBI Taxonomy refs (TaxIDs): 29448Reference(s) to other database(s): GTC:G62876YX
Show glycosyltransferases
There is only one chemically distinct structure:
Expand this record
Collapse this record
Menestrina J, Iacomini M, Jones C, Gorin P
Similarity of monosaccharide, oligosaccharide and polysaccharide structures in gum exudate of Anacardium occidentale
Phytochemistry 47(5) (1998)
715-721
Anacardium occidentale
(NCBI TaxID 171929,
species name lookup)
Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Organ / tissue: gum
The structure was elucidated in this paperNCBI PubMed ID: 9542167Publication DOI: 10.1016/S0031-9422(97)00666-3Journal NLM ID: 0151434Publisher: Elsevier
Institutions: National Institute for Biological Standart and Controls, Potters Bar, Herts, UK, Departamento de Bioquímica, University Federal do Paraná, Curitiba, Brazil
The gum exudate from the Brazilian cashew-nut tree (Anacardium occidentale) contained traces of the reducing sugars, rhamnose (0.005%), arabinose (0.03%), mannose (0.007%), galactose (0.03%), glucose (0.02%), β- D-Galp-(l → 6)-αβ-D-Gal (0.05%), α-L-Rhap-(l → 4)-αβ-D-GlcA (0.008%) and α-L-Rhap-(1 → 4)-β-D-GlcpA-(l → 6)-β-D-Galp-(l → 6)-αβ-D-Gal (0.008%). Rhamnose, arabinose, glucose and the three oligosaccharides are components of the side-chains of the gum polysaccharide, which has a main chain of (1 → 3)-linked β-D-Galp units. The structure of this polysaccharide was determined and found to differ from that previously reported for the gum of a tree growing in India, lacking units of 4-O- methylglucuronic acid. Other new side-chain structures were characterized, particularly -α-D-Galp-(l → 6)-D-Galp- and α-L-Araf-(1 → 6)-D-Galp-.
polysaccharide, Oligosaccharides, monosaccharides, Anacardiaceae, Anacardium occidentale, cashew-nut tree, gum
Structure type: fragment of a bigger structure
Location inside paper: p. 718, scheme, compound 5
Compound class: glucuronorhamnan
Contained glycoepitopes: IEDB_115136,IEDB_136105,IEDB_140630,IEDB_225177,IEDB_423153,IEDB_885823
Methods: 13C NMR, 1H NMR, methylation, GC-MS, TLC, Smith degradation, light scattering, optical rotation measurement, precipitation, HMQC, DEPT, COSY
Comments, role: molecular mass of total polysacharide: 110000 Da
Related record ID(s): 63686, 63687, 63688, 63747
NCBI Taxonomy refs (TaxIDs): 171929Reference(s) to other database(s): GTC:G22364GR
Show glycosyltransferases
There is only one chemically distinct structure:
Expand this record
Collapse this record
Total list of record IDs on all result pages of the current query:
Execution: 5 sec
report error