C4=C5-N7的形成：甘氨酰胺核糖核苷酸合成酶（GART(E1)）

称谓

甘氨酰胺核糖核苷酸合成酶 PurD

催化反应

[[5-磷酸核糖胺（5PRA）]]+[[C2：甘氨酸（Gly，glycine）]]+ATP->[[甘氨酰胺核苷酸（GAR）]]+ADP+$

\usepackage{chemfig}
\begin{document}

\chemfig{
	\fbox{R}-[2,0.8]N(-[3,0.3]9)
}

+
\chemfig{
	(=[2,0.8]O)
	(-[7.5,0.8]HO)
	(-[4.5,0.8]
		-[3.5,0.8]NH_2
	)
}

+ATP

\begin{tikzpicture} 
\draw [->] (0,0) to node[above] {GART(E1);^{2+}$} (1,0); 
\end{tikzpicture}

\chemfig{
	\fbox{R}-[2,0.8]NH(-[2,0.25]9)
	-[3.5,0.6](-[3.3,0.25]4)(=[4.5,0.7]O)
	=[2,0.8](-[4.8,0.25]5)
	-[0.5,0.8]NH_2(-[5.5,0.25]7)
}
+ADP
+$

\end{document}