Taxonomic group: bacteria / Firmicutes
(Phylum: Firmicutes)
Associated disease: infection due to Streptococcus thermophilus [ICD11:
XN4LM 
]
The structure was elucidated in this paperPublication DOI: 10.1016/j.carbpol.2016.03.063Journal NLM ID: 8307156Publisher: Elsevier
Correspondence: yangzhennai
th.btbu.edu.cn; 282047573
qq.com
Institutions: College of Food Science and Engineering, Jilin Agricultural University, Changchun, Chin, Beijing Laboratory of Food Quality and Safety, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, China
Exopolysaccharide (EPS) produced by Streptococcus thermophilus GST-6 in skim milk was extracted and purified. The EPS was composed of glucose and galactose in a molar ratio of 1.80:1.03 with identical primary structure to the EPS from S. thermophilus ST1 reported previously. The purified EPS was sulphated at a sulphonation degree of 0.26+/-0.03, and presence of sulphate groups in the sulphated EPS (SEPS) was confirmed. Microstructural studies demonstrated a porous web with coarse surface for the EPS while the SEPS appeared as stacked flakes with relatively uniform shapes. Sulphonation of the EPS slightly decreased its degrading temperature from 234.6 degrees C to 232.5 degrees C. The DPPH, superoxide and hydroxyl radicals scavenging activities of the EPS were significantly (P<0.05) improved after sulphonation. The SEPS also showed stronger inhibitory activity than the EPS against Eschericia coli, Salmonella typhimurium and Staphylococcus aureus.
exopolysaccharide, antibacterial activity, Antioxidant, Streptococcus thermophilus GST-6, Sulphonation
Structure type: polymer chemical repeating unit
Location inside paper: p.370, fig.2B
Compound class: EPS
Contained glycoepitopes: IEDB_136044,IEDB_136095,IEDB_137472,IEDB_141794,IEDB_141806,IEDB_142487,IEDB_142488,IEDB_144998,IEDB_146664,IEDB_190606,IEDB_241101,IEDB_983931,SB_165,SB_166,SB_187,SB_192,SB_195,SB_6,SB_7,SB_88
Methods: 13C NMR, 1H NMR, NMR-2D, acid hydrolysis, FTIR, composition analysis, electron microscopy, statistical analysis, atomic force microscop, antioxidant activities, antibacterial assay
NCBI Taxonomy refs (TaxIDs): 1308Reference(s) to other database(s): GTC:G64107RT, GlycomeDB:
37826
Show glycosyltransferases
There is only one chemically distinct structure:
Found 
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