title: Identification of glycosomes and metabolic end products in pathogenic and nonpathogenic strains of Cryptobia salmositica (Kinetoplastida: Bodonidae).
abstract: Whole cell lysates of pathogenic and nonpathogenic strains of Cryptobia salmositica were subjected to subcellular fractionation using differential and isopycnic centrifugation in sucrose. The glycolytic enzymes hexokinase, fructose-1,6-biphosphate aldolase, triosephosphate isomerase, glucosephosphate isomerase and glyceraldehyde-3-phosphate-dehydrogenase and the peroxisomal enzyme catalase were associated with a microbody that had a buoyant density in sucrose of 1.21 g cm-3. Lactate dehydrogenase was detected in whole cell lysates, but not in purified organelles. A microbody with a positive reaction for catalase was detected in electron microscope sections of the pathogenic and nonpathogenic strains. These catalase-containing microbodies fused with lipid bodies and vacuoles, arose by division from pre-existing microbodies and expelled their contents into the cytoplasm of the cell. Both strains also modified the catalase content in their microbodies. Under aerobic conditions, they metabolized glucose to pyruvate and lactate. We conclude that part of the glycolytic pathway in C. salmositica is compartmentalized in a microbody called the glycosome.
authors.affiliation: Department of Zoology, University of Guelph, Ontario, Canada.
authors.forename: B F
authors.initials: BF
authors.lastname: Ardelli
authors.forename: J D
authors.initials: JD
authors.lastname: Witt
authors.forename: P T
authors.initials: PT
authors.lastname: Woo
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D000818:Animals; D002374:Catalase / Q000378:metabolism; D002451:Cell Compartmentation; D005393:Fish Diseases / Q000469:parasitology*; D005947:Glucose / Q000378:metabolism; D006019:Glycolysis; D007525:Isoelectric Focusing / Q000662:veterinary; D016830:Kinetoplastida / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D008854:Microscopy, Electron; D017686:Oncorhynchus mykiss; D011529:Protozoan Infections, Animal / Q000378:metabolism / Q000469:parasitology*; D019810:Sodium Azide / Q000494:pharmacology
chemical_list: D019810:Sodium Azide; D002374:Catalase; D005947:Glucose