Evolution of proteins in digestive fluid of carnivorous plants

各种酶的活性已被报道在食肉植物的消化液和几个基因编码的酶的特点，虽然他们的起源和进化还没有得到很好的研究。我们分析了三个独立进化的猪笼草阿拉塔，瓶子草，和Ceatrotus follicularis以及茅膏菜的消化液分泌蛋白质的氨基酸序列。蛋白质的相似性搜索和系统发育分析表明，非肉食性植物的同源蛋白质的流体。这表明，肉食性酶是从非肉食性植物中使用的酶，包括致病和发育。

Activities of various enzymes have been reported in a digestive fluid of carnivorous plants and several genes coding the enzymes were characterized, although their origin and evolution have not been well studied. We analyzed amino acid sequences of secreted proteins in digestive fluids of three independently evolved pitcher plants Nepenthes alata, Sarracenia purpurea, and Cephalotus follicularis as well as a sundew Drosera adelae. Similarity search of the proteins and phylogenetic analyses showed that non-carnivorous plants have homologous proteins to those in the fluid. This suggests that carnivorous enzymes were co-opted from those used in non-carnivorous plants, including pathogenesis and development.