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Evidence for cooperative effects in human liver arginase

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1982
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Carvajal Baeza, Nelson
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Evidence for cooperative effects in human liver arginase
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Author
  • Carvajal Baeza, Nelson;
  • Acoria García, Marina;
  • Rodríguez Vives, Juan Pablo;
  • Fernández Gálvez, Mireya;
  • Martínez Winkler, Jorge;
Abstract
The reaction kinetics of human liver arginase (l-arginine amidinohydrolase, EC 3.5.3.1) in terms of arginine concentration is strikingly altered by varying the pH. Lowering the pH from the optimum (9.5) toward a more physiological value (7.5) there is a transition from hyperbolic to sigmoidal kinetics. The cooperative effects are observed in the presence and absence of the product ornithine. Dimers of arginase exhibit typical Michaelis-Menten kinetics even in the presence of ornithine. Dimer-dimer interactions are suggested to explain the kinetic properties of arginase at pH 7.5.
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Identifier
URI: https://repositorio.uchile.cl/handle/2250/157190
DOI: 10.1016/0167-4838(82)90324-7
ISSN: 01674838
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Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular, Volumen 701, Issue 1, 1982, Pages 146-148
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