Here we report that trypanosomatid flagellates of the genus Blastocrithidia possess catalase. This enzyme is not phylogenetically related to the previously characterized catalases in other monoxenous trypanosomatids, suggesting that their genes have been acquired independently. Surprisingly, Blastocrithidia catalase is less enzymatically active, compared to its counterpart from Leptomonas pyrrhocoris, posing an intriguing biological question why this gene has been retained in the evolution of trypanosomatids.

中文翻译：

---

一种神秘的过氧化氢酶。

在这里我们报告说，破伤风菌属的锥虫鞭毛鞭毛拥有过氧化氢酶。该酶与其他单叶锥虫的先前表征的过氧化氢酶在系统发育上不相关，表明它们的基因已独立获得。出乎意料的是，相比于拟南芥（Leptomonas pyrrhocoris）的对应而言，瘟疫杆菌过氧化氢酶的酶活性较低，这引起了一个有趣的生物学问题，即为什么该基因在锥虫的进化过程中得以保留。