title: Clearing of suspensions of Micrococcus lysodeikticus catalysed by lysozymes from hen, goose, and turkey egg whites, human milk, and phage T4. Assessment of potential as signal generators for homogeneous enzyme immunoassays for urinary steroids.
abstract: Lysozymes (3.2.1.17) from goose (Anser anser) egg white, turkey (Melagris gallopavo) egg white, phage T4 and human milk were compared with hen egg white lysozyme in their ability to clear a suspension of Micrococcus lysodeikticus. All of the lysozymes, except hen egg white lysozyme, catalysed the clearing of the Micrococcus lysodeikticus suspension in a biphasic fashion. Compared to hen egg white lysozyme, the total absorbance or transmission change over 5 and 20 minutes was less in all cases, except for human lysozyme. Human lysozyme was, therefore, a potential alternative, more rapid signal generator for the measurement of urinary estrone glucuronide excretion rates because of its structural similarity to hen egg white lysozyme. The apparent K(M) values for hen egg white lysozyme increased with the enzyme concentration.
authors.affiliation: Institute of Molecular Biosciences, Massey University, Palmerston North, New Zealand.
authors.forename: Delwyn G
authors.initials: DG
authors.lastname: Cooke
authors.forename: Leonard F
authors.initials: LF
authors.lastname: Blackwell
mesh_terms: D000818:Animals; D001433:Bacteriolysis; D017122:Bacteriophage T4 / Q000201:enzymology; D002384:Catalysis; D002645:Chickens / Q000378:metabolism; D005260:Female; D005298:Fertility; D005777:Geese / Q000378:metabolism; D006801:Humans; D006894:Hydroxyestrones / Q000652:urine; D007124:Immunoenzyme Techniques; D008837:Micrococcus / Q000187:drug effects; D008895:Milk, Human / Q000201:enzymology; D009113:Muramidase / Q000737:chemistry* / Q000494:pharmacology; D013256:Steroids / Q000652:urine*; D014422:Turkeys / Q000378:metabolism
chemical_list: D006894:Hydroxyestrones; D013256:Steroids; C002005:2-methoxyestrone-3-glucuronide; C421864:hen egg lysozyme; D009113:Muramidase