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Purification and Partial Characterization of a Rainbow Trout Egg Lectin
Author(s) -
Bildfell Robert J.,
Markham Frederick R. J.,
Johnson Gerald R.
Publication year - 1992
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1992)004<0097:papcoa>2.3.co;2
Subject(s) - rainbow trout , biology , affinity chromatography , lectin , molecular mass , rhamnose , biochemistry , western blot , trout , antiserum , yolk , gel electrophoresis , sepharose , glycoprotein , hemagglutination , polyacrylamide gel electrophoresis , microbiology and biotechnology , gel permeation chromatography , antibody , chemistry , mannose , fish <actinopterygii> , immunology , fishery , gene , enzyme , organic chemistry , polymer
A lectin that agglutinates rabbit red blood cells (RBCs) and human type B RBCs was isolated from ova of rainbow trout Oncorhynchus mykiss . Hemagglutination of rabbit RBCs was inhibited completely by 10 mM L‐rhamnose but not by certain other sugars, 100 mM EDTA, or 100 mM 2‐mercaptoethanol. Partial purification of this hemagglutinating material was achieved by affinity chromatography of an H 2 O‐dialyzed yolk homogenate on rhamnose‐linked Sepharose. A polyacrylamide gel electrophoresis (SDS‐PAGE) performed on this sample revealed two polypeptides with approximate molecular masses of 19 kilodaltons (kDa) and 30 kDa. By fast‐phase liquid chromatography, proteins with a molecular mass of less than 20 kDa were separated from other elements of the affinity‐purified hemagglutinating material. These proteins were found to lack hemagglutinating activity. When a western blot with rabbit antilectin antiserum was performed against yolk extract, rainbow trout serum, or yolk from larvae, a 30‐kDa polypeptide was detected within all three samples. If the rainbow trout serum and egg lectins are the same molecule, then the biological function of the rainbow trout egg lectin may include host defense or perhaps a basic, homeostatic mechanism such as glycoprotein transport