کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10881327 1077022 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Diversity of conotoxin types from Conus californicus reflects a diversity of prey types and a novel evolutionary history
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
پیش نمایش صفحه اول مقاله
Diversity of conotoxin types from Conus californicus reflects a diversity of prey types and a novel evolutionary history
چکیده انگلیسی
Most species within the genus Conus are considered to be specialists in their consumption of prey, typically feeding on molluscs, vermiform invertebrates or fish, and employ peptide toxins to immobilize prey. Conus californicus Hinds 1844 atypically utilizes a wide range of food sources from all three groups. Using DNA- and protein-based methods, we analyzed the molecular diversity of C. californicus toxins and detected a correspondingly large number of conotoxin types. We identified cDNAs corresponding to seven known cysteine-frameworks containing over 40 individual inferred peptides. Additionally, we found a new framework (22) with six predicted peptide examples, along with two forms of a new peptide type of unusual length. Analysis of leader sequences allowed assignment to known superfamilies in only half of the cases, and several of these showed a framework that was not in congruence with the identified superfamily. Mass spectrometric examination of chromatographic fractions from whole venom served to identify peptides corresponding to a number of cDNAs, in several cases differing in their degree of posttranslational modification. This suggests differential or incomplete biochemical processing of these peptides. In general, it is difficult to fit conotoxins from C. californicus into established toxin classification schemes. We hypothesize that the novel structural modifications of individual peptides and their encoding genes reflect evolutionary adaptation to prey species of an unusually wide range as well as the large phylogenetic distance between C. californicus and Indo-Pacific species.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicon - Volume 57, Issue 2, February 2011, Pages 311-322
نویسندگان
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