Linked Life Data

9406788

Source:http://linkedlifedata.com/resource/pubmed/id/9406788

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1998-1-6
pubmed:abstractText
The major cathepsin B-like proteinase of adult Schistosoma japonicum has been isolated for the first time. Affinity chromatography with the mammalian cathepsin B inhibitor glycyl-phenylalanyl-glycine-semicarbazone purified a protein that was identified by N-terminal sequencing as Sj31. Sensitivity of Sj31 to PNGase F demonstrated the presence of asparagine-linked N-glycan. Marked resistance to the action of Endo-beta-glycosidase H indicated that most of the N-glycan chains are of the complex type. Binding of horseradish peroxidase-conjugated lectins demonstrated the presence of N-mannose, N-acetylglucosamine, and N-acetyllactosamine type 2 in the N-glycan. Fucose was not detected, and the presence of sialic acid remained questionable. Sj31 degraded the fluorogenic substrates Z-Phe-Arg-NMec and Z-Arg-Arg-NMec with an optimum between pH 5.0 and 6.0. The specific activity was 18-21-fold higher with the Phe-Arg substrate compared with the Arg-Arg substrate, whereas this value was 4-6-fold for bovine spleen cathepsin B, thus suggesting differences in the S2 subsite between parasite and host proteinases. Quantitative purification of Sj31 led to the conclusion that cathepsin B-like activity predominates over cathepsin L-like activity in S. japonicum. Because Sj31 degraded hemoglobin in vitro and was localized in the parasite gut, the proteinase may degrade ingested proteins in vivo.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0022-3395
pubmed:author
pubmed:issnType
Print
pubmed:volume
83
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1112-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Affinity isolation and characterization of the cathepsin B-like proteinase Sj31 from Schistosoma japonicum.
pubmed:affiliation
Institute of Tropical Hygiene, University of Heidelberg, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't