Taxonomic group: bacteria / Firmicutes
(Phylum: Firmicutes)
Associated disease: infection due to Streptococcus pneumoniae [ICD11:
XN3PW 
]
NCBI PubMed ID: 9383201Journal NLM ID: 8712028Publisher: Blackwell Publishing
Correspondence: zeijst
vetmic.dgk.ruu.nl
Institutions: Department of Bacteriology, Institute of Infectious Diseases and Immunology, Utrecht,The Netherlands
We have reported previously on seven genes (cps14B-H) of Streptococcus pneumoniae serotype 14, which are part of the type 14 capsular polysaccharide synthesis (cps14) locus. This study describes the cloning and sequencing of the remaining part of the cps14 locus. The entire cps14 gene cluster consists of 12 open reading genes (cps14A to cps14L), which appear to be arranged as a single transcriptional unit. The flanking regions of the cps14 locus contain vestiges of insertion elements. Moreover, a 115-bp-long repeated DNA element, which is also present in several other intergenic regions on the pneumococcal chromosome, has been identified upstream of cps14A. All 12 open reading frames (ORFs) were inactivated by the insertion of a tetracycline resistance cassette. The cps14A to cps14J and cps14L mutants were unencapsulated, whereas only a limited amount of capsular polysaccharide was expressed by a cps14K insertion mutant. Comparison with DNA and protein sequences available in databases allowed us to predict functions for four out of the five new cps14 gene products. The biosynthetic function of Cps14I was determined experimentally by analysis of intermediates in the synthesis of the type 14 tetrasaccharide subunit, catalysed by membrane preparations of Escherichia coli expressing pneumococcal glycosyltransferases. The cps14I gene encodes the β-1,3-N-acetylglucosaminyltransferase activity necessary for the addition of the third sugar in the synthesis of the type 14 repeating unit. The activity encoded by cps14J was established using a synthetic glycosyltransferase acceptor: cps14J encodes a β-1,4-galactosyltransferase, which requires β-linked GlcNAc as an acceptor. Thus, Cps14J is responsible for the addition of the last (fourth) sugar in the synthesis of the type 14 subunit.
biosynthesis, synthesis, tetrasaccharide, gene, capsular, polysaccharide, serotype, Streptococcus, Streptococcus pneumoniae, analysis, molecular, locus, capsular polysaccharide, glycosyltransferases, identification, glycosyltransferase, CPS
Structure type: polymer chemical repeating unit
Location inside paper: page 198
Compound class: CPS, O-polysaccharide, O-antigen
Contained glycoepitopes: IEDB_130646,IEDB_130697,IEDB_135813,IEDB_136044,IEDB_137340,IEDB_137472,IEDB_137776,IEDB_1391966,IEDB_1392542,IEDB_140108,IEDB_140110,IEDB_140122,IEDB_141794,IEDB_141807,IEDB_142351,IEDB_142487,IEDB_142488,IEDB_143634,IEDB_146664,IEDB_149138,IEDB_149139,IEDB_149141,IEDB_149142,IEDB_149143,IEDB_149144,IEDB_149145,IEDB_149147,IEDB_149148,IEDB_149149,IEDB_149150,IEDB_149151,IEDB_151531,IEDB_190606,IEDB_983931,SB_145,SB_165,SB_166,SB_173,SB_187,SB_192,SB_195,SB_30,SB_6,SB_7,SB_88
Enzymes that release or process the structure: b-1,4-glycosyltransferase
Biosynthesis and genetic data: genetic data, biochemical data
Comments, role: capsular synthesis. Published chemical repeating unit frame was shifted for the uniformity of structures in the database.
Related record ID(s): 2849, 3766, 5348, 6002, 6406, 7502, 25415, 104240, 110608, 113253, 117208, 130172
NCBI Taxonomy refs (TaxIDs): 1313Reference(s) to other database(s): GTC:G52755VD, GlycomeDB:
2039, CCSD:
11172, CBank-STR:12723
Show glycosyltransferases
There is only one chemically distinct structure:
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