Figure 1.
Biochemical properties of xylan XylT activity in microsomes from poplar stems. The XylT activity was measured by incubating microsomes with UDP-[14C]-Xyl and Xyl4 and counting the amount of radioactivity of the reaction products according to Lee et al.16 All assays were repeated twice and the data are means ± SE. (A) Dependence of the XylT activity on the acceptor concentration. (B) Time course of the transfer of the radiolabeled xylosyl residues onto the acceptor by the XylT activity. (C) The XylT activity is protein concentration-dependent.