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Fungal ribotoxins are a group of extracellular ribonucleases (RNases) secreted by fungi. Their most notable characteristic is their extraordinary specificity. They inactivate ribosomes by cutting a single phosphodiester bond of the rRNA that is found in a universally conserved sequence. This cleavage leads to cell death by apoptosis. However, since they are extracellular proteins, they must first enter the cells that constitute their target to exert their cytotoxic action. This entry constitutes the rate-determining step of their action.

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  • Ribotoxina fúngica (es)
  • Fungal ribotoxin (en)
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  • Fungal ribotoxins are a group of extracellular ribonucleases (RNases) secreted by fungi. Their most notable characteristic is their extraordinary specificity. They inactivate ribosomes by cutting a single phosphodiester bond of the rRNA that is found in a universally conserved sequence. This cleavage leads to cell death by apoptosis. However, since they are extracellular proteins, they must first enter the cells that constitute their target to exert their cytotoxic action. This entry constitutes the rate-determining step of their action. (en)
  • Las ribotoxinas fúngicas son un grupo de ribonucleasas (RNasas) extracelulares secretadas por hongos.​​ Su característica más notable es su insólita especificidad. Inactivan de forma eficaz los ribosomas al cortar un único enlace fosfodiester del rRNA que se encuentra dentro de una secuencia conservada de forma universal.​​ Este corte conduce a la muerte celular por apoptosis.​ Sin embargo, y dado que son proteínas extracelulares, primero deben entrar en las células que constituyen su diana para ejercer su acción citotóxica. Esta entrada constituye el paso limitante de su acción. No se ha encontrado un receptor proteico, así que para penetrar en las células deben aprovechar cambios de permeabilidad y de las propiedades biofísicas de las membranas, producidos por fenómenos como la transform (es)
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