Document Detail

Sialic acid-specific lectin from Tritrichomonas foetus.
MedLine Citation:
PMID:  10366765     Owner:  NLM     Status:  MEDLINE    
A novel sialic acid-specific lectin (TFL) was isolated from Tritrichomonas foetus culture supernatant and purified by erythrocyte adsorption followed by fetuin-agarose affinity chromatography. According to gel filtration TFL is a protein of 728 kDa, different from the two sialidases of 853 and 254 kDa, secreted by T. foetus into the medium. The lectin is formed by multimeric complexes of 66 kDa subunit according to SDS-PAGE under reducing conditions. TFL is glycosylated with 4.2% of carbohydrates, half of which is represented by glucose. The lectin reacts equally with N-acetyl and N-glycolyl neuraminic acid, free, in alpha2,3- or alpha2,6-linkage. TFL has 7-fold weaker affinity to alpha2,8-linked N-acetylneuraminic acid (Neu5Ac) in colominic acid. Horse erythrocytes containing 4-O-acetyl Neu5Ac are agglutinated equally as compared to the human cells. TFL affinity to 9-O-acetyl Neu5Ac is 4-fold weaker as documented by hemagglutination inhibition with de-O-acetylated bovine submaxillary mucin, and ovine submaxillary mucin. A panel of mono- and oligosaccharides other than Neu5Ac do not inhibit TFL activity at 200 mM. The lectin does not require bivalent cations for activity, shows optimal reactivity at neutral pH and is stable at 4 degrees C. Anti-TFL antibodies identify membrane positivity on T. foetus, suggesting that the lectin functions in adhesion of the parasites. These findings, together with good stability and immunogenicity, make TFL a prospective candidate for further studies, especially in searching for efficient diagnostics and prevention of bovine trichomoniasis.
P Babál; F F Pindak; L C Russell; W A Gardner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  1428     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1999 Jun 
Date Detail:
Created Date:  1999-07-29     Completed Date:  1999-07-29     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  106-16     Citation Subset:  IM    
Department of Pathology, University of South Alabama, 2451 Fillingim Street, Mobile, AL 36617, USA.
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MeSH Terms
Amino Acids / analysis
Carbohydrates / analysis
Chromatography, Affinity
Electrophoresis, Polyacrylamide Gel
Erythrocytes / immunology
Hemagglutination Tests
Lectins / chemistry,  immunology,  isolation & purification*
Neuraminidase / chemistry*
Tritrichomonas foetus / chemistry*,  enzymology
Grant Support
2-P41-RR05351-06/RR/NCRR NIH HHS
Reg. No./Substance:
0/Amino Acids; 0/Carbohydrates; 0/Lectins; EC

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