One of the major environmental problems facing the 
world today is the contamination of soil, water and
air  by  toxic  chemicals  as  a  result  of  industrializa
tion  and  extensive  use  of  pesticides  in  agriculture.
. 
Incineration is currently  the most  effective and co
mmon remediation  practice  but is  costly in terms  of
money  and  energy  used.  A  rapid  cost  effective  and  e
cologically  responsible  method  of  clean-up  is 
“bioremediation” which utilizes micro-organisms to 
degrade toxic pollutants in an efficient economical
approach.  Toxic  chemicals  are  degraded  to  less  harm
ful  forms.  Although,  bioremediation  by  bacteria 
agents has received attention of workers, the role 
of fungi has been inadequately studied. The ability
of 
fungi  to  transform  a  wide  variety  of  hazardous  chem
icals  has  aroused  interest  in  using  them  for 
bioremediation. Mushroom forming fungi (mostly basi
diomycetes), are amongst nature’s most powerful 
decomposers,  secreting  strong  extra  cellular  enzyme
s  due  to  their  aggressive  growth  and  biomass 
production. These enzymes include lignin peroxidase
s (LiP), manganese peroxidase (MnP) and laccase, 
etc.  Thus,  carbon  sources  such  as  sawdust,  straw  an
d  corn  cob  can  be  used  to  enhance  degradation 
rates  by  these  organisms  at  polluted  sites.  White  r
ot  fungi  have  been  used  for  biotransformation  of 
pesticides,  degradation  of  petroleum  hydrocarbons  a
nd  lignocellulolytic  wastes  in  the  pulp  and  paperindustry. 
The main mechanism of biodegradation employed by this 
group   of   fungi   is   the   lignin   degradation   system   of 
enzymes.    Extra-cellular    lignin    modifying    enzymes 
(LME’s)  have  very  low  substrates-specificity  so  they  are 
able  to  mineralize  a  wide  range  of  highly  recalcitrant 
organopollutants   that   is   structurally   similar   to   lignin.   The   major 
components  of  lignin  degradation  system  include  lignin-
peroxidase  (LiP),  manganese  peroxidase  (MnP),  H2O2
producing enzymes and laccase, 
although  not  all  lignolytic  fungi  show  the  three  types  ofenzymatic activity. 
It   has   been   demonstrated   that   a   lot   of   species 
belonging  to  the  group  of  white-rot  fungi  are  ableto 
degrade  lignin,  which  is  a  naturally  occurring  polymer
.This  capacity  is  assumed  to  resultfrom 
the   activities   of   extracellular   oxidases   and   laccases.   These   enzymes   are   non-
specific;  they  oxidize  a  wide  range  of  xenobiotics. 
 
 
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