Comparison Of Three Fungal Laccases From Rigidoporus Lignosus And Pleurotus Ostreatus: Correlation Between Conformation Changes And Catalytic Activity(122 visite) Bonomo RP, Cennamo G, Purrello R, Santoro AM, Zappala R
J Chem Res (ISSN: 0162-0134, 1873-3344, 0162-0134print), 2001 Jan 1; 83(1): 67-75.
Tipo di articolo: Journal Article, Comparative Study, Research Support, Non-U. S. Gov'T,
Impact factor: 1.729, Impact factor a 5 anni: 3.452
Url: Non disponibile.
Parole chiave: Catalysis, Circular Dichroism, Electron Spin Resonance Spectroscopy, Enzyme Stability, Hydrogen-Ion Concentration, Laccase, Osmolar Concentration, Oxidoreductases Chemistry Metabolism, Pleurotus Enzymology, Polyporales Enzymology, Protein Conformation, Temperature,
*** IBB - CNR *** Dipartimento di Scienze Chimiche, Universita di Catania, Italy. rbonomo@dipchi. unict. it,
The conformation changes in solution of three fungal laccases in different environmental conditions were examined by circular dichroism (CD) and electron paramagnetic resonance (EPR) spectroscopy. CD measurements indicate that the secondary structure of proteins depends slightly on the pH or ionic strength, though the presence of salt could interfere in the molecular recognition process between substrates and enzymes. The enzymes, however, are highly destabilized by prolonged exposure to low pH or high temperature. The observed unfolding of the proteins coincides with their inactivation and, in some cases, with precipitation. On the other hand, these conditions do not determine the disruption of the geometric arrangement of their metal centres, and this fact suggests that these centres represent the more stable core of the proteins
382 Records (375 escludendo Abstract e Conferenze). Impact factor totale: 1490.138 (1460.65 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 1557.798 (1526.055 escludendo Abstract e Conferenze).