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Corpus Systématique Animale

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Comparative studies of ?-Lactalbumin and lysozyme: Echidna lysozyme

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Springer (journals)
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  • K. E. Hopper 1
  • H. A. McKenzie 1
  • 1) Depart. of Physical Biochemistry, Institute of Advanced Studies, Australian National University, Canberra, ACT

?-Lactalbumin is a modifier protein for galactosyl transferase in the biosynthesis of lactose and lysozyme catalyses the cleavage of ?(1–4) glycosidic linkages. It is now generally believed that ?-lactalbumin and lysozyme have diverged from a common ancestor. Comparative studies of these proteins from several species are reported here. The presence of lactose and lactose synthetase activity is shown in mature milk samples from a variety of placental mammals (eutheria) and a pouch bearing mammal (marsupialia). The isolation of the ?-lactalbumins involved and their properties are compared. The position is different in the milk samples of monotremes. The ?-lactalbumin, lactose and lactose synthetase activity levels in the two platypus samples studied are very low. The levels of lactose and lactose synthetase activity in some echidna(Tachyglossus aculeatus) samples are low, but appreciable in others. No ?-lactalbumin is present. The lysozyme activity is appreciable, some samples containing a different lysozyme from that present in others. One of these (designated echidna lysozyme I) is capable of lactose synthetase modifier activity in the presence of bovine “A protein”. The properties of this lysozyme are compared with those of lysozymes and ?-lactalbumins from a variety of species and their significance is discussed.

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  • 1 - health sciences
  • 2 - biomedical research
  • 3 - biochemistry & molecular biology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - genetique des eucaryotes. evolution biologique et moleculaire
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Cell Biology
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Clinical Biochemistry
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Molecular Biology
  • 1 - Health Sciences ; 2 - Medicine ; 3 - General Medicine
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  • 1 - science ; 2 - cell biology
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Molecular and Cellular Biochemistry

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  • Mammiferes
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