Uma abordagem peptidômica do venedo do escorpião Tityus serrulatus
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Data
2013-02-27
Autores
Menegasso, Anally Ribeiro da Silva [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O aumento populacional de animais peçonhentos em áreas urbanizadas ou de atividades relacionadas à exploração de áreas naturais vem favorecendo um aumento significativo na ocorrência de acidentes devido ao contato do homem com estes animais. Dessa forma, o envenenamento por toxinas animais tem sido objeto de muitos estudos pelo homem por se revelarem úteis no desenvolvimento de novos fármacos e de novas abordagens metodológicas ou técnicas resolutivas. Os acidentes por escorpiões são os que apresentam o maior número de registro de casos dentre todos os animais peçonhentos no Brasil. Ao longo dos mais de cem anos de pesquisas com venenos destes animais, o foco toxinológico tem se concentrado quase que exclusivamente nas proteínas, responsáveis pela difusão do veneno nos tecidos das presas e/ou vítimas de ferroadas, e principalmente nos peptídeos longos (apresentando entre 30 e 70 resíduos de amino ácidos) responsáveis pelas ações neurotóxicas. A despeito da existência de pequenos peptídeos lineares nesses venenos são raros os estudos que visam elucidar a estrutura molecular e funcional dos pequenos peptídeos. O presente estudo teve como objetivo investigar peptídeos deste grupo (negligenciados) no veneno do escorpião Tityus serrulatus. Para isto, o veneno bruto deste escorpião foi submetido a extração diretamente em acetonitrila 50 % (v/v), e a fração solúvel foi fracionada, e cada fração individual foi submetida à análise por espectrometria de massas ESI-IT-TOF-MS e MSn a fim obter as sequências completas de novos peptídeos. A estratégia utilizada permitiu a identificação de cinco novos peptídeos, estruturalmente diferenciados daqueles já descritos na literatura. Os peptídeos caracterizaram-se por serem lineares e não possuírem cisteínas. Desta forma, eles ampliam a classe...
The increasing population of venomous animals in urbanized areas or activities related to the exploitation of natural areas has favored significant accidents due to human contact with these animals. Thus, the toxins from animal venoms has been the subject of many studies prove useful in developing new drugs and new methodological approaches or high-resolution techniques. Scorpions’s accidents are those with the highest number of reported cases among all venomous animals. More than a hundred years of research with these poisons animals, the principal focus toxinology is on proteins, responsible for the spread of the venom in tissues prey or victims, especially in neurotoxic peptides (presenting between 30 and 70 amino acid residues). Despite on the existence of small and linear peptides in these venoms are few studies exploring the molecular structure and function of small peptides. The present study aimed to the study of this peptides group (at moment is neglected) from scorpion venom Tityus serrulatus. For this, the venom were fractionated by chromatography, posteriorly each fraction was subjected to individual analysis by mass spectrometry (LC-MS IT-ToF) in order to obtain the complete sequence about novel peptides. This strategy promoted the detection of five undiscovered peptide sequences highly differentiated those previously described at literature. The peptides were characterized like non-disulfide-bridged peptides it is contributed to expanding the class of scorpions peptides with similar physicochemical characteristic. Two peptides were synthesized on solid phase (fraction 14 and fraction 18) and tested by biological activity in vivo and in vitro. The fraction 18 showed us antinociceptive and edematogenic effect, in addition to antibiotic effect. These results has been demonstrated the large biotechnology... (Complete abstract click electronic access below)
The increasing population of venomous animals in urbanized areas or activities related to the exploitation of natural areas has favored significant accidents due to human contact with these animals. Thus, the toxins from animal venoms has been the subject of many studies prove useful in developing new drugs and new methodological approaches or high-resolution techniques. Scorpions’s accidents are those with the highest number of reported cases among all venomous animals. More than a hundred years of research with these poisons animals, the principal focus toxinology is on proteins, responsible for the spread of the venom in tissues prey or victims, especially in neurotoxic peptides (presenting between 30 and 70 amino acid residues). Despite on the existence of small and linear peptides in these venoms are few studies exploring the molecular structure and function of small peptides. The present study aimed to the study of this peptides group (at moment is neglected) from scorpion venom Tityus serrulatus. For this, the venom were fractionated by chromatography, posteriorly each fraction was subjected to individual analysis by mass spectrometry (LC-MS IT-ToF) in order to obtain the complete sequence about novel peptides. This strategy promoted the detection of five undiscovered peptide sequences highly differentiated those previously described at literature. The peptides were characterized like non-disulfide-bridged peptides it is contributed to expanding the class of scorpions peptides with similar physicochemical characteristic. Two peptides were synthesized on solid phase (fraction 14 and fraction 18) and tested by biological activity in vivo and in vitro. The fraction 18 showed us antinociceptive and edematogenic effect, in addition to antibiotic effect. These results has been demonstrated the large biotechnology... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Arachnida, Aracnideo, Peptídeos, Toxicologia, Escorpião - Veneno, Toxinas, Veneno
Como citar
MENEGASSO, Anally Ribeiro da Silva. Uma abordagem peptidômica do venedo do escorpião Tityus serrulatus. 2013. 129 f. Dissertação - (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2013.