A solid-phase assay for beta-1,4-galactosyltransferase activity in human serum using recombinant aequorin.
A solid-phase assay for beta-1,4-galactosyltransferase activity in human serum using recombinant aequorin.
复制标题
使用重组水母发光蛋白固相测定人血清中的 β-1,4-半乳糖基转移酶活性。
DOI:
10.1016/0003-2697(91)90166-q
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发表时间:
1991
影响因子:
2.9
通讯作者:
Cummings,RD
中科院分区:
文献类型:
--
作者:
Zatta,PF;Nyame,K;Cormier,MJ;Mattox,SA;Prieto,PA;Smith,DF;Cummings,RD
We have developed a sensitive and rapid solid-phase assay for the serum enzyme UDPGal:β-d-GlcNAc β-1,4-galactosyltransferase (β1,4-GT) (EC 2.4.1.38) that employs the recombinant bioluminescent protein aequorin as the enzyme label for product detection. The substrate for β1,4-GT is a neoglycoprotein, bovine serum albumin containing covalently attached GlcNAc residues (GlcNAc-BSA), and it was immobilized by adsorption in microtiter plate wells. Serum samples were added to each well along with saturating levels of UDPGal and Mn2+. Galactosylation of the neoglycoprotein acceptor by the serum β1,4-GT produces the N-acetyllactosamine derivative Galβ1,4GlcNAc-BSA. The product formed is quantified by adding the biotinylated plant lectin Ricinus communis agglutinin-I, which binds specifically to N-acetyllactosamine, followed by the addition of streptavidin and the biotinylated aequorin. Aequorin produces a flash of light in response to Ca2+and is detectable to 10−19mol in a luminometer. Using this assay, the β1,4-GT activity in human serum and the activity of a semipurified β1,4-GT are linear with time and serum concentration over a wide range. The reaction is dependent on UDPGal and Mn2+, is highly reproducible with a low background, and can be performed in a few hours. Assays employing aequorin have a wider range of linearity than those employing horseradish peroxidase as an enzyme label. These results demonstrate that the assay for β1,4-GT is useful for determining activity in heterogeneous samples and also demonstrate the utility of the recombinant protein aequorin for solid-phase assay methods.
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DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sheares,BT;Lau,JT;Carlson,DM
通讯作者:
Carlson,DM
DOI:
10.1056/nejm197809282991306
发表时间:
1978
期刊:
The New England journal of medicine
影响因子:
--
作者:
D. Podolsky;M. Weiser;K. Isselbacher;A. M. Cohen
通讯作者:
A. M. Cohen
影响因子:
15.9
作者:
KIM, YS;PERDOMO, J;CURTIS, KJ
通讯作者:
CURTIS, KJ
影响因子:
20.3
作者:
Fukuda,MN;Masri,KA;Dell,A;Thonar,EJ;Klier,G;Lowenthal,RM
通讯作者:
Lowenthal,RM
影响因子:
4.1
作者:
LAMMERS, G;JAMIESON, JC
通讯作者:
JAMIESON, JC