کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2064968 1076898 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparative analyses of venoms from American and African Sicarius spiders that differ in sphingomyelinase D activity
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
پیش نمایش صفحه اول مقاله
Comparative analyses of venoms from American and African Sicarius spiders that differ in sphingomyelinase D activity
چکیده انگلیسی

Spider venoms are cocktails of toxic proteins and peptides, whose composition varies at many levels. Understanding patterns of variation in chemistry and bioactivity is fundamental for understanding factors influencing variation. The venom toxin sphingomyelinase D (SMase D) in sicariid spider venom (Loxosceles and Sicarius) causes dermonecrotic lesions in mammals. Multiple forms of venom-expressed genes with homology to SMase D are expressed in venoms of both genera. SMase D activity levels differ among major clades with American Sicarius vastly reduced relative to all Loxosceles and African Sicarius despite expression of SMase D homologs in venoms of American Sicarius. Here we report comparative analyses of protein composition and insecticidal activity of crude venoms from three Sicarius species, two from South Africa and one from Central America. Comparative 2-dimensional electrophoresis shows dense regions of proteins in the size range of SMase D in all three species, but there are differences in sizes and isoelectric points (pIs). Few proteins strictly co-migrate and there are clusters of proteins with similar pIs and molecular weights whose patterns of similarity do not necessarily reflect phylogenetic relatedness. In addition, PD50 estimates on crickets indicate a small though significant decrease in potency of South American Sicarius venoms relative to African species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicon - Volume 55, Issue 7, 15 June 2010, Pages 1274–1282
نویسندگان
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