title: Growth-promoting effect on iron-sulfur proteins on axenic cultures of Entamoeba dispar.
abstract: A growth-promoting factor (GPF) that promotes the growth of Entamoeba dispar under axenic culture conditions was found in fractions of mitochondria (Mt), hydrogenosomes (Hg) and chloroplasts (Cp) obtained from cells of six different protozoan, mammalian and plant species. We were able to extract the GPF from the Cp-rich leaf cells of a plant (spiderwort: Commelina communis L.) in an acetone-soluble fraction as a complex of chlorophyll with low molecular weight proteins (molecular weight [MW] approximately 4,600). We also found that on treatment with 0.6% complexes of 2-mercapthoethanol (2ME), complexes of chlorophyll-a with iron-sulphur (Fe-S) proteins (e.g., ferredoxins [Fd] from spinach and Clostridium pasteurianum) and noncomplex rubredoxin (Rd) from C. posteurianum have a growth-promoting effect on E. dispar. These findings suggest that E. dispar may lack a sufficient quantity of some essential components of Fe-S proteins, such as Fe-S center.
authors.affiliation: Department of Tropical Medicine and Parasitology, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan.
authors.forename: S A M
authors.initials: SA
authors.lastname: Khalifa
authors.forename: E
authors.initials: E
authors.lastname: Imai
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.forename: A
authors.initials: A
authors.lastname: Haghighi
authors.forename: E
authors.initials: E
authors.lastname: Hayakawa
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
mesh_terms: D000818:Animals; D002736:Chloroplasts / Q000737:chemistry; D034822:Commelina / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D004747:Entamoeba / Q000187:drug effects* / Q000254:growth & development*; D005288:Ferredoxins / Q000494:pharmacology*; D008928:Mitochondria / Q000737:chemistry; D008970:Molecular Weight; D010936:Plant Extracts / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D010940:Plant Proteins / Q000494:pharmacology*; D012416:Rubredoxins / Q000494:pharmacology
chemical_list: D005288:Ferredoxins; D010936:Plant Extracts; D010940:Plant Proteins; D012416:Rubredoxins