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Título del libro: Giardia And Cryptosporidium: From Molecules To Diseases
Título del capítulo: Protein kinase C in giardiaduodenalis: A family affair

Autores UNAM:
MARTHA ROBLES FLORES;
Autores externos:

Idioma:
Inglés
Año de publicación:
2009
Resumen:

The induction of Giardia duodenalis encystment entails an exquisite interplay amon?transducer elements, which proceeds in a highly ordered manner in response to externa?stimuli and leads to changes in gene expression. However, little is known about how thi?parasite transduces the signals of its external environment during encystment. We hav?identified in Giardia duodenalis protein kinase C-like isoforms (?, d, e, ? and ?) usin?specifi c polyclonal antibodies raised against mammalian PKC isoforms, and these protein?showed a differential expression pattern during encystment. Moreover, this kinas?family has been shown to have a role during encystment because PKC inhibitors blocke?the differentiation process. In particular, the PKCß-like molecule (gPKCß) with an atypica?high molecular weight (150 kDa), showed a gradual increase in expression during encystmen?of the parasite and also redistributed from cytoplasm to plasma membrane soo?after encystment induction, suggesting that it may play an important role during the differentiatio?process. Additional biochemical characterization of gPKCß showed that thi?isoform displayed in vitro kinase activity dependent on cofactors required by conventiona?PKCs, i.e. phospholipid, diacylglycerol and calcium. In the Giardia genome database,?an ORF that encodes for a homologue of PKCß catalytic domain was found an?cloned. The gPKC features, together with its divergent nature, indicate that this enzym?may constitute a promising target for drug design to block the encystment, and therefor?the transmission, of this parasite.© CAB International 2009.


Entidades citadas de la UNAM: