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Título del libro: Proteins: Membrane Binding And Pore Formation
Título del capítulo: Pore Formation by Cry Toxins

Autores UNAM:
MARIO SOBERON CHAVEZ; LILIANA PARDO LOPEZ; ROBERTO CARLOS MUÑOZ GARAY; JORGE FELIX SANCHEZ QUINTANA; ISABEL GOMEZ GOMEZ; HELENA PORTA DUCOING; MARIA ALEJANDRA BRAVO DE LA PARRA;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Resumen:

Bacillus thuringiensis (Bt) bacteria produce insecticidal Cry and Cyt proteins used in the biological control of different insect pests. In this review, we will focus on the 3d-Cry toxins that represent the biggest group of Cry proteins and also on Cyt toxins. The 3d-Cry toxins are pore-forming toxins that induce cell death by forming ionic pores into the membrane of the midgut epithelial cells in their target insect. The initial steps in the mode of action include ingestion of the protoxin, activation by midgut proteases to produce the toxin fragment and the interaction with the primary cadherin receptor. The interaction of the monomeric Cry1A toxin with the cadherin receptor promotes an extra proteolytic cleavage, where helix alpha-1 of domain I is eliminated and the toxin oligomerization is induced, forming a structure of 250 kDa. The oligomeric structure binds to a secondary receptor, aminopeptidase N or alkaline phosphatase. The secondary receptor drives the toxin into detergent r


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