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Entamoeba histolyticaEhGEF1 structure and mutational analysis: New specific residues critical for function.
Hernández-Cuevas, N A; Campos-Parra, A D; Almaraz-Barrera, Ma de J; Aguilar-Rojas, A; González-de la Rosa, C H; Sosa-Peinado, A; Hernández-Rivas, R; Rojo-Domínguez, A; Vargas, M.
Afiliação
  • Hernández-Cuevas NA; Departamento de Biomedicina Molecular, Centro de Investigación y de Estudios Avanzados, México, D.F., Mexico.
Mol Biochem Parasitol ; 164(2): 118-25, 2009 Apr.
Article em En | MEDLINE | ID: mdl-19135094
This paper reports the EhGEF1-EhRacG and EhGEF1-EhRho1 molecular complexes from Entamoeba histolytica. The not conserved amino acids Gln201,Tyr299, Gln302, Lys312, Asn313, Phe314 and Ile324 were localized, by means of an in silico computational analysis, at the interface of the exposed face from the DH domain of EhGEF1, which are important to establish the contact with its target GTPases EhRacG and EhRho1. Functional studies of nucleotide exchange of Phe314Ala mutant showed a decrement of 80% on EhRacG GTPase; in contrast the Ile324Ala mutant exhibited a reduction of 77%, specifically on EhRho1; meanwhile the Gln302Ala mutant showed a reduction of approximately 50% on the exchange activity for both GTPases. Moreover, the functional studies of the protein EhGEF1 mutants in the conserved residues Thr194Ala, Asn366Ala and Glu367Ala indicated that contrary to what has been reported for other systems, the mutation of these residues did not alter considerably its catalytic activity.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Proteínas de Protozoários / Canais de Cloreto / Entamoeba histolytica Limite: Animals Idioma: En Revista: Mol Biochem Parasitol Ano de publicação: 2009 Tipo de documento: Article País de afiliação: México País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Proteínas de Protozoários / Canais de Cloreto / Entamoeba histolytica Limite: Animals Idioma: En Revista: Mol Biochem Parasitol Ano de publicação: 2009 Tipo de documento: Article País de afiliação: México País de publicação: Holanda