title: Protein compositional analysis of the eggs of black widow spider (Latrodectus tredecimguttatus): implications for the understanding of egg toxicity.
abstract: Previous work found that high-molecular-weight fractions in the egg extract of Latrodectus tredecimguttatus exhibited strong toxicities. For investigating the possible relationship of proteins in the eggs with the toxic effect, the protein composition of the eggs was analyzed using proteomic strategies and compared with that of the spider's venom. SDS-PAGE showed that the proteins of eggs were primarily distributed in the molecular weight range of higher than 55 kDa as well as around 34 kDa, having high abundance proteins with molecular weights of about 60 kDa and 130 kDa. A total of 157 proteins were identified from the egg extract, which were involved in important cellular functions and processes including catalysis, transport, and metabolism regulation. Comparison indicated that the protein composition of eggs is more complex than that of venom, and there are few similarities between the protein composition of the two materials, demonstrating that the eggs have their own distinct toxic mechanism.
authors.affiliation: College of Life Sciences, Hunan Normal University, Changsha, Hunan, 410081, People's Republic of China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Zhigui
authors.initials: Z
authors.lastname: Duan
authors.forename: Rui
authors.initials: R
authors.lastname: Cao
authors.forename: Xianchun
authors.initials: X
authors.lastname: Wang
authors.forename: Songping
authors.initials: S
authors.lastname: Liang
mesh_terms: D000818:Animals; D001740:Black Widow Spider / Q000378:metabolism* / Q000472:pathogenicity; D004527:Egg Proteins / Q000032:analysis*; D008970:Molecular Weight; D010063:Ovum / Q000737:chemistry*; D040901:Proteomics
chemical_list: D004527:Egg Proteins