title: Iron-sulfur protein in mitochondrial complexes of Spodoptera litura as potential site for ROS generation.
abstract: Mitochondrial complex I is the main source of reactive oxygen species (ROS) production, but the exact site of superoxide generation or their relative contribution is not clear. This study aims to determine the function of iron-sulfur clusters (ISCU) in the initiation of ROS generation. ISCU2 and ISCU8 were cloned from Spodoptera litura which shared the conserved amino acid sequence with other insects. The expressions of the two genes were ubiquitous throughout the whole development stages and tissues. Knockdown of ISCU2 and ISCU8 resulted in the decline of the ROS, whereas rotenone and azadirachtin treatment up-regulated ROS levels by increasing mRNA expression. Furthermore, antioxidant enzyme activity of SOD and POD were up-regulated by rotenone and azadirachtin treatment and then declined after ISCU was silenced. Our results suggest the possibility that the molecules of ISCU2 and ISCU8 in complex I may serve as potential sites in the initiation of ROS generation.
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: 787834208@qq.com.
authors.forename: Liangde
authors.initials: L
authors.lastname: Li
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: dxlcx@163.com.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Dong
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: shubenshui@126.com.
authors.forename: Benshui
authors.initials: B
authors.lastname: Shu
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: sallywz618@163.com.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: hqbscau@126.com.
authors.forename: Qiongbo
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Laboratory of Insect Toxicology, South China Agricultural University, Guangzhou, Guangdong 510642, PR China. Electronic address: guohuazhong@scau.edu.cn.
authors.forename: Guohua
authors.initials: G
authors.lastname: Zhong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D007506:Iron-Sulfur Proteins / Q000235:genetics* / Q000378:metabolism; D024101:Mitochondrial Proteins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D017382:Reactive Oxygen Species / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D016415:Sequence Alignment; D061987:Sf9 Cells; D018411:Spodoptera / Q000235:genetics* / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D000975:Antioxidants; D019476:Insect Proteins; D007506:Iron-Sulfur Proteins; D024101:Mitochondrial Proteins; D017382:Reactive Oxygen Species
keywords: Iron–sulfur clusters; Mitochondrial; ROS generation; Spodoptera litura