A comparative study of two isoforms of laccase secreted by the 'white- rot' fungus Rigidoporus lignosus, exhibiting significant structural and functional differences
A comparative study of two isoforms of laccase secreted by the 'white- rot' fungus Rigidoporus lignosus, exhibiting significant structural and functional differences(141 visite) Bonomo RP, Boudet AM, Cozzolino R, Rizzarelli E, Santoro AM, Sterjiades R, Zappalà R
Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy UMR CNRS/UPS5546, Ctr. de Biol. et Physiol. Vegetales, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France Ist. Stud. Sostanze Naturali I., CNR, Sezione Stud. Modelli Metallo-Enzimi, Viale A. Doria 6, 95125 Catania, Italy
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Two isoforms of laccase were obtained as the predominant phenol-oxidases in defined medium liquid cultures of the 'white-rot' fungus Rigidoporus lignosus (R. lignosus). A characterization of the two laccases was made in terms of molecular mass, isoelectric point, metal content and N-terminal sequence. Furthermore, in order to gain information on the structural features related to the metal centers, a study of their geometric arrangement and their redox ability was made. It turned out that the two isoenzymes greatly differed with regard to pH stability, catalytic and copper centers features. It is proposed that all such differences are dependent on the amino acid sequences, which cause a distortion of the copper sites, thus accounting for the redox potential values and kinetic properties.
Santulli G, Cipolletta E, Sorriento D, Del Giudice C, Anastasio A, Monaco S, Maione AS, Condorelli G, Puca A, Trimarco B, Illario M, Iaccarino G * CaMK4 gene deletion induces hypertension(175 visite) J Am Heart Assoc Journal Of The American Heart Association (ISSN: 2047-9980), 2012; 1(4): N/D-N/D. Impact Factor:2.882 DettagliEsporta in BibTeXEsporta in EndNote
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