کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1932933 | 1050597 | 2009 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crystal structure of α-1,3-galactosyltransferase (α3GT) in a complex with p-nitrophenyl-β-galactoside (pNPβGal) Crystal structure of α-1,3-galactosyltransferase (α3GT) in a complex with p-nitrophenyl-β-galactoside (pNPβGal)](/preview/png/1932933.png)
The specificities of glycosyltransferases make them useful for the synthesis of biologically active oligosaccharides, but also restrict their range of products. In substrate engineering, substrate promiscuity is enhanced by attaching removable interactive groups to weak substrates. Thus, the attachment of βp-nitrophenyl converts galactose from a poor into a good substrate of α-1,3-galactosyltransferase. The crystallographic structure of a complex of α3GT containing p-nitrophenyl-β-galactoside shows that the p-nitrophenyl binds similarly to the N-acetylglucosamine of the substrate, N-acetyllactosamine, interacting with the indole of Trp249. p-Nitrophenyl, unlike N-acetylglucosamine, makes no H-bonds but has more non-polar interactions, making it an effective monosaccharide mimetic.
Journal: Biochemical and Biophysical Research Communications - Volume 385, Issue 4, 7 August 2009, Pages 601–604