title: Eimeria tenella: genomic organization and expression of an 89kDa cyclophilin.
abstract: Though parasite cyclophilins are promising new drug targets, Eimeria tenella cyclophilins have not been characterized yet. Here, we describe an 89kDa cyclophilin, designated EtCYP89. It is expressed throughout the developmental cycle of E. tenella, both in the intracellular stages in chicken and in extracellular sporulated oocysts and sporozoites. The EtCYP89 protein contains two Ser-rich domains in its NH2-terminus separated by a His-rich stretch. WD40 repeats are localized in the central part of the protein followed by a cyclophilin domain at the COOH-terminus. Both protein and genomic organization of EtCyp89 are conserved in comparison with its ortholog TgCyp81.6 in Toxoplasma gondii, except for the absence of a Ser- and His-rich NH2-terminus in TgCYP81.6. In particular, those 13 residues are conserved which are responsible for binding the anti-coccidial drug cyclosporine A.
authors: Division of Molecular Parasitology and Biological and Medical Research Centre, Heinrich-Heine-University, Universitätsstr. 1, 40225 Düsseldorf, Germany.
authors: Ralf J
authors: RJ
authors: Hosse
authors: Jürgen
authors: J
authors: Krücken
authors: Stefan
authors: S
authors: Bierbaum
authors: Gisela
authors: G
authors: Greif
authors: Frank
authors: F
authors: Wunderlich
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D021983:Cyclophilins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D018076:DNA, Complementary / Q000737:chemistry; D016786:Eimeria tenella / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D015870:Gene Expression; D018503:Genome, Protozoan / Q000502:physiology*; D008297:Male; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D016053:RNA, Protozoan / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
chemical_list: D018076:DNA, Complementary; D016053:RNA, Protozoan; D021983:Cyclophilins