title: Entamoeba histolytica: alterations in EhRabB protein in a phagocytosis deficient mutant correlate with the Entamoeba dispar RabB sequence.
abstract: We analyzed the expression and location of EhRabB in clone L-6, a phagocytosis-deficient mutant of Entamoeba histolytica, in comparison with the wild-type clone A. Intriguingly, trophozoites of clone L-6 express more EhRabB than those of clone A. However, the majority of EhRabB-containing vesicles remained in the cytoplasm of clone L-6 during phagocytosis. To investigate molecular alterations in EhRabB of clone L-6 we compared the EhrabB gene sequences from clones L-6 and A. We also isolated, sequenced and compared the RabB protein of Entamoeba dispar. Results showed that EhrabB gene of clone L-6 is 98.2 and 94.1% identical to rabB genes of E. dispar and clone A, respectively. The rabB genes from clone A and E. dispar have 92.2% identity. Four out of five amino acids changes in RabB proteins of clone L-6 and E. dispar are shared. These changes may alter the binding of effector proteins and the specific subcellular location of EhRabB.
authors.affiliation: Departamento de Patología Experimental, Centro de Investigación y de Estudios Avanzados del IPN. A.P. 14-740, Mexico, D.F. 07000, Mexico.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Guzmán-Medrano
authors.forename: Beatriz A
authors.initials: BA
authors.lastname: Castillo-Juárez
authors.forename: Rosa María
authors.initials: RM
authors.lastname: García-Pérez
authors.forename: Andrés
authors.initials: A
authors.lastname: Salas-Casas
authors.forename: Esther
authors.initials: E
authors.lastname: Orozco
authors.forename: Mario A
authors.initials: MA
authors.lastname: Rodríguez
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015153:Blotting, Western; D018076:DNA, Complementary / Q000737:chemistry; D016054:DNA, Protozoan / Q000737:chemistry; D003720:Densitometry; D004591:Electrophoresis, Polyacrylamide Gel; D004747:Entamoeba / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D004748:Entamoeba histolytica / Q000737:chemistry* / Q000235:genetics / Q000276:immunology; D008969:Molecular Sequence Data; D009154:Mutation; D010587:Phagocytosis / Q000235:genetics / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics / Q000302:isolation & purification; D016053:RNA, Protozoan / Q000235:genetics / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020691:rab GTP-Binding Proteins / Q000737:chemistry / Q000235:genetics* / Q000502:physiology
chemical_list: D018076:DNA, Complementary; D016054:DNA, Protozoan; D012333:RNA, Messenger; D016053:RNA, Protozoan; D020691:rab GTP-Binding Proteins