代谢
木糖最常见和传统的代谢途径是氧化还原酶途径(或木糖还原酶-木糖醇脱氢酶,XR-XDH途径)。在这个途径中,木糖首先在木糖醇脱氢酶(XDH)酶和NADH或NADPH的作用下被还原成木糖醇。产生的木糖醇随后在木糖醇脱氢酶(XDH)酶和辅因子NAD的作用下被氧化成D-木酮糖。最后,D-木酮糖在利用ATP的激酶(木酮糖激酶酶)的作用下被磷酸化,生成D-木酮糖-5-磷酸,它在核苷酸合成的戊糖磷酸途径中作为一种中间体。
The most common and traditional metabolism pathway for xylose is the oxidoreductase pathway (or xylose reductase-xylitol dehydrogenase, XR-XDH pathway). In this pathway, xylose is first reduced to xylitol using the xylitol dehydrogenase (XDH) enzyme with NADH or NADPH. The resultant xylitol is subsequently oxidized to D-xylulose by the xylitol dehydrogenase (XDH) enzyme while utilizing the cofactor NAD. Finally, the D-xylulose is phosphorylated by an ATP utilizing kinase (xylulose kinase enzyme) to generate D-xylulose-5-phosphate, which serves as an intermediate in the pentose phosphate pathway for nucleotide synthesis.
来源:DrugBank