Development of screening methods for detection of carbohydrate-binding proteins by use of soluble glycosylated polyacrylamide-based copolymers.
Mammalian endogenous carbohydrate-binding proteins (lectins) play fundamental roles in a variety of mechanisms of interactions both at the molecular and cellular levels. We have investigated the binding of one of them (human brain lectin) to soluble acrylamide copolymerized with derivatives of either lactose (O-beta-lactosyloxyallylallylaminoacrylamide copolymer) or D-mannose (D-alpha-mannosyloxyallylallylaminoacrylamide copolymer) in direct enzyme affinoassays, in an attempt to develop simple procedures for detection and estimation of its carbohydrate-binding activity. Biotinylated plant lectins were utilized as reference standards. Affinoassays employed the polymer dotted on nitrocellulose and the polymer coated on microtiter plates as well as detection of bound biotinylated lectin by streptavidin/horseradish peroxidase reagent. Both assays provided reproducible binding, inhibitable by specific sugars. The microtiter plate assay is well suited to sensitive detection of the negative endogenous lectin by competition with biotinylated brain lectin. We conclude that the use of derivatized acrylamide in dotting and microtiter plate assays may prove practical for detection of endogenous lectins and that such polymers may serve as model substances in the study of biological partners of these carbohydrate-binding proteins.
Chadli
A
A
Laboratoire de Biochimie et Technologie des Protéines, Université Paris-nord, Bobigny, France.
Caron
M
M
Tichá
M
M
Joubert
R
R
Bladier
D
D
Kocourek
J
J
D000180:Acrylic Resins / Q000737:chemistry; D001667:Binding, Competitive; D001923:Brain Chemistry; D002240:Carbohydrate Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000302:isolation & purification*; D004353:Drug Evaluation, Preclinical; D005069:Evaluation Studies as Topic; D006031:Glycosylation; D006801:Humans; D007124:Immunoenzyme Techniques; D037102:Lectins / Q000737:chemistry / Q000302:isolation & purification*; D008969:Molecular Sequence Data; D011956:Receptors, Cell Surface; D012995:Solubility; D000099166:Polyacrylamides
D000180:Acrylic Resins; D002352:Carrier Proteins; D037102:Lectins; D011956:Receptors, Cell Surface; D000099166:Polyacrylamides; C055213:saccharide-binding proteins