A midgut-specific lytic polysaccharide monooxygenase of Locusta migratoria is indispensable for the deconstruction of the peritrophic matrix  

作　　者：Ming-Bo Qu Xiao-Xi Guo Lin Kong Ling-Jie Hou Qing Yang 

机构地区：[1]School of Bioengineering,Dalian University of Technology,Dalian,Liaoning Province,China [2]State Key Laboratory for Biology of Plant Diseases and Insect Pests,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing,China [3]Shenzhen Branch,Guangdong Laboratory of Lingnan Modern Agriculture,Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs,Agricultural Genomics Institute at Shenzhen,Chinese Academy of Agricultural Sciences,Shenzhen,Guangdong Province,China

出　　处：《Insect Science》2022年第5期1287-1298,共12页昆虫科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(31872972,31830076);the Shenzhen Science and Technology Program(KQTD20180411143628272).

摘　　要：Lytic polysaccharide monooxygenases(LPMOs)are important enzymes that boost the hydrolysis of recalcitrant polysaccharides,such as chitin.They are found extensively in different insect species and are classified as auxiliary activities family 15(AA15)LPMOs(LPMO15).Some of them were identified from the insect midgut and proven to act on chitin.However,knowledge about their physiological roles during insect growth and development remains limited.Here,we found that midgut-specific LPMO15s are widely distributed in different insect orders,such as the orthopteran Locusta migratoria and the lepidopteran Bombyx mori.Using L.migratoria as a model insect,the function of midgut-specific LmLPMO15-3 during development was investigated.Double-stranded RNA-mediated downregulation of LmLPMO15-3 expression at the 4th or 5th instar nymph stage severely decreased the survival rate and resulted in lethal phenotypes.Hematoxylin and eosin staining results indicated that the deficient individuals exhibited incompletely digested peritrophic matrix(PM),which suggested that LmLPMO15-3 is essential for the deconstruction of the PM during molting.This study provides direct evidence of the physiological importance of a midgut-specific LPMO15 during insect development.As L.migratoria is one of the most destructive agricultural pests,LmLPMO15-3 is a potential target for pest management.

关 键 词：CHITIN Locusta migratoria lytic polysaccharide monooxygenase MIDGUT peritrophic matrix RNAi 

分 类 号：Q96[生物学—昆虫学]