Naphthyl Thio- and Carba-xylopyranosides for Exploration of the Active Site of ß-1,4-Galactosyltransferase 7 (ß4GalT7)

• Xyloside analogues with substitution of the endocyclic oxygen atom by sulfur or carbon were investigated as substrates for -1,4-galactosyltransferase7 (4GalT7), a key enzyme in the biosynthesis of glycosaminoglycan chains. The analogues with an endocyclic sulfur atom proved to be excellent substrates for 4GalT7, and were galactosylated approximately fifteen times more efficiently than the corresponding xyloside. The 5a-carba--xylopyranoside in the d-configuration proved to be a good substrate for 4GalT7, whereas the enantiomer in the l-configuration showed no activity. Further investigations by X-ray crystallography, NMR spectroscopy, and molecular modeling provided a rationale for the pronounced activity of the sulfur analogues. Favorable - interactions between the 2-naphthyl moiety and a tyrosine side chain of the enzyme were observed for the thio analogues, which open up for the design of efficient GAG primers and inhibitors.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

NATURVETENSKAP  -- Kemi -- Organisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Organic Chemistry (hsv//eng)

Nyckelord

carbohydrates

enzymes

structure-activity relationships

xylosides

carbohydrates

enzymes

structure–activity relationships

xylosides

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