Abstract:
:Opsonizing and agglutinating activities of plasma from the freshwater clam, Corbicula fluminea, were found to be inhibited by the sugars, 2-deoxy-D-glucose (deoxy-Glu) and N-acetyl-D-galactosamine (GalNAc). The plasma opsonin/agglutinin was subsequently isolated by a two-step separation procedure. Aldehyde-fixed rabbit erythrocytes (RRBC) were used as a solid-phase plasma opsonin affinity absorbant, and deoxyGlu and GalNAc were used in the eluting buffer to desorb several RRBC-binding plasma proteins. The second step involved the further separation of sugar-eluted proteins by Sephacryl S-200 gel filtration. A plasma protein with an apparent molecular weight of 40 kd on SDS-PAGE under nonreducing conditions was found to possess both agglutinating and opsonizing activities. It was further shown to be composed of two identical 20 kd subunits associated through disulfide linkage(s). Although this protein shares some structural similarity with other bivalve opsonins, differences in native molecular size or subunit structure, agglutinating properties and/or sugar binding specificity support the current hypothesis that naturally occurring plasma opsonins of molluscs represent a heterogeneous group of proteins unified primarily through their lectin-like characteristic of binding specific carbohydrate determinants.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Yang R,Yoshino TPdoi
10.1016/0145-305x(90)90032-asubject
Has Abstractpub_date
1990-10-01 00:00:00pages
397-404issue
4eissn
0145-305Xissn
1879-0089pii
0145-305X(90)90032-Ajournal_volume
14pub_type
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journal_title:Developmental and comparative immunology
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journal_title:Developmental and comparative immunology
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journal_title:Developmental and comparative immunology
pub_type: 杂志文章,评审
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journal_title:Developmental and comparative immunology
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journal_title:Developmental and comparative immunology
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journal_title:Developmental and comparative immunology
pub_type: 杂志文章
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journal_title:Developmental and comparative immunology
pub_type: 杂志文章
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journal_title:Developmental and comparative immunology
pub_type: 杂志文章
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