Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
Associated disease: infection due to Escherichia coli [ICD11:
XN6P4 
]
NCBI PubMed ID: 9920866Publication DOI: 10.1074/jbc.274.6.3272Journal NLM ID: 2985121RPublisher: Baltimore, MD: American Society for Biochemistry and Molecular Biology
Correspondence: skawascb
mbox.nc.kyushu-u.ac.jp
Institutions: Departments of Molecular Biology, Graduate School of Medical Science and Biology, Faculty of Science, Kyushu University, Fukuoka 812-8581, Department of Life Science, Faculty of Bioscience and Bioengineering, Tokyo Institute of Technology, Yokohama 226-8501, Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Tokyo 101-0062, Japan., Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Tokyo 101-0062, Japan
14-kDa lectin, named tachylectin-3, was newly identified from hemocytes of the Japanese horseshoe crab, Tachypleus tridentatus. This lectin exhibited hemagglutinating activity against human A-type erythrocytes, but not against the B- and O-types of erythrocytes and animal erythrocytes, including those of sheep, rabbit, horse, and bovine. The hemagglutinating activity of tachylectin-3 was equivalent to that of a previously identified lectin, named tachylectin-2, with affinity for N-acetyl-D-glucosamine or N-acetyl-D-galactosamine. However, the activity of tachylectin-3 was not inhibited by these two N-acetylhexosamines at 100 mM but was inhibited by a blood group A-pentasaccharide at a minimum inhibitory concentration of 0.16 mM. Furthermore, the hemagglutinating activity was strongly inhibited by bacterial S-type lipopolysaccharides (LPSs) from Gram-negative bacteria but not by R-type LPSs lacking O-antigens. One of the most effective S-type LPSs was from Escherichia coli O111:B4, with a minimum inhibitory concentration of 6 ng/ml. These data suggest that tachylectin-3 specifically recognizes Gram-negative bacteria through the unique structural units of O-antigens. Ultracentrifugation analysis revealed that tachylectin-3 is present in dimer in solution. A cDNA coding for tachylectin-3 was isolated from a hemocyte cDNA library. Tachylectin-3 consisted of two repeating sequences, each with a partial sequence similarity to rinderpest virus neuraminidase. Tachylectin-3 and three previously isolated types of tachylectins were all predominantly expressed in hemocytes and released from hemocytes in response to external stimuli. These lectins present at injured sites suggest that they probably serve synergistically to accomplish an effective host defense against invading microbes.
antigen, lipopolysaccharides, O-antigen, specificity, blood group A, lectin
Structure type: suggested polymer biological repeating unit
Location inside paper: p.3277, fig. 6
Compound class: O-polysaccharide, O-antigen
Contained glycoepitopes: IEDB_130648,IEDB_135813,IEDB_136044,IEDB_136906,IEDB_137340,IEDB_137472,IEDB_137473,IEDB_1391962,IEDB_141794,IEDB_141807,IEDB_142078,IEDB_143794,IEDB_144990,IEDB_150899,IEDB_151528,IEDB_151531,IEDB_167071,IEDB_190606,SB_137,SB_156,SB_165,SB_166,SB_173,SB_187,SB_195,SB_29,SB_7,SB_88
Biological activity: binding with tachylectin-3
Biosynthesis and genetic data: genetic data
Comments, role: polymerization frame corrected
Related record ID(s): 5554, 7142, 7240, 7241, 8618, 11273, 20658, 28398, 30374, 108629, 113595, 113759
NCBI Taxonomy refs (TaxIDs): 2170726Reference(s) to other database(s): GTC:G20452PD, GlycomeDB:
28111, CCSD:
12259, CBank-STR:15047
Show glycosyltransferases
There is only one chemically distinct structure:
Found 
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