Taxonomic group: fungi / Ascomycota
(Phylum: Ascomycota)
NCBI PubMed ID: 6298248Publication DOI: 10.1083/jcb.96.1.160Journal NLM ID: 0375356Publisher: New York: Rockefeller University Press
Institutions: Department of Cellular Physiology and Immunology, The Rockefeller University, New York, USA
We have examined the effects of various mannans, glycoproteins, oligosaccharides, monosaccharides, and sugar phosphates on the binding and phagocytosis of yeast cell walls (zymosan) by mouse peritoneal macrophages. A phosphonomannan (PO(4):mannose ratio = 1:8:6) from Kloeckera brevis was the most potent inhibitor tested; it inhibited binding and phagocytosis by 50 percent at concentrations of approximately 3-5 mug/ml and 10 mug/ml, respectively. Removal of the phosphate from this mannan by mild acid and alkaline phosphatase treatment did not appreciably reduce its capacity to inhibit zymosan phagocytosis. The mannan from Saccharomyces cerevisiae mutant LB301 inhibits phagocytosis by 50 percent at 0.3 mg/ml, and a neutral exocellular glucomannan from pichia pinus inhibited phagocytosis by 50 percent at 1 mg/ml. Cell wall mannans from wild type S. cerevisiae X2180, its mnn2 mutant which contains mannan with predominantly 1(-)6-linked mannose residues, yeast exocellular mannans and O-phosphonomannans were less efficient inhibitors requiring concentrations of 1-5 mg/ml to achieve 50 percent reduction in phagocytosis. Horseradish peroxidase, which contains high-mannose type oligosaccharides, was also inhibitory. Mannan is a specific inhibitor of zymosan binding and phagocytosis. The binding and ingestion of zymosan but not of IgG- or complement-coated erythrocytes can be obliterated by plating macrophages on substrates coated with poly-L-lysin (PLL)-mannan. Zymosan uptake was completely abolished by trypsin treatment of the macrophages and reduced by 50-60 percent in the presence of 10 mM EGTA. Pretreatment of the macrophages with chloroquine inhibited zymosan binding and ingestion. These results support the proposal that the macrophage mannose/N-acetylglucosamine receptor (P. Stahl, J.S. Rodman, M.J. Miller, and P.H. Schlesinger, 1978, Proc. Natl. Acad. Sci. U.S.A. 75:1399-1403), mediates the phagocytosis of zymosan particles.
phagocytosis
Structure type: polymer chemical repeating unit
Location inside paper: p.161
Trivial name: glycogen backbone
Compound class: mannan
Contained glycoepitopes: IEDB_130701,IEDB_140116,IEDB_141793,IEDB_141828,IEDB_144983,IEDB_152206,IEDB_153220,IEDB_153762,IEDB_153763,IEDB_76933,IEDB_983930,SB_198,SB_44,SB_67,SB_72
Methods: TLC, acid hydrolysis, HPLC, biological assay, macrophage activity assay, phagocytosis assay
Biological activity: LB-301 mannan was approximately 10-fold more potent than wild type or mnn2 mannan as a phagocytosis inhibitor
Comments, role: D-configuration and pyranose cycle was assumed by CSDB staff
Related record ID(s): 45422, 45424, 45425
NCBI Taxonomy refs (TaxIDs): 4932Reference(s) to other database(s): GTC:G55317BB, CCSD:
30340, CBank-STR:8083
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There is only one chemically distinct structure:
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