Microbial oxidoreductases, including both peroxidases
and laccases, have been investigated for biotechnological
application including paper pulp bleaching in chlorine-free
sequences (Paice et al., 1995; Bajpai, 2004; Sigoillot
et al., 2005). Ligninolytic peroxidases, in contrast to laccases
and low-redox-potential peroxidases that are used
in several industrial sectors (e.g. textiles, detergents, food
and beverages, etc.), are not still commercially available
due to different reasons including the low levels of
enzyme obtained from natural and recombinant hosts.
Moreover, these oxidoreductases in most cases are not
suitable biocatalysts as they are produced in nature.
Industrial processes often require enzymes recognizing
specific substrates or proceeding under extreme conditions
(e.g. high hydrogen peroxide concentration or
extreme pH and temperature).