Molecular Plant Breeding 2016, Vol.7, No.9, 1-16
http:// mpb.biopublisher.ca
8
been found (Klotz and Loewen, 2003). A third catalase
gene named as Cat-C with a predicted 475 amino
acids polyoeptide chain and a peroxisome targeting
signal was characterized by Kawasaki and Aguirre,
(2001). It has been revealed from genomic analysis
that two catalase peroxidases namely Kat-G1 and
Kat-G2 are encoded by two genes in fungi (Zamocky
et al., 2009; Zamocky et al., 2012). In genetic and
biochemical studies Chary and Natvig, (1989)
described that N. crassa contains three catalases that
are encoded by three different genes. The functions of
three enzymes differ in response to heat shock,
development and superoxide mediated stress. The
three loci that we have designated as cat-1, cat-2 and
cat-3 are located to the right arm of chromosomes III,
VII and III, respectively. It was confirmed that during
rapid growth of mycelia, cat-1 (designated as Cat-1;
approximate molecular weight, 315,000; pI 5.2) was
predominant and its activity was gradually increased
in paraquat treated and heat shocked mycelium.
Further investigations revealed that Cat-2 (Mw,
165,000; pl 5.4) was not present in rapid growth
mycelia, however, present in conidia and stationary
phase mycelium at low level. This catalase was
predominant in extracts obtained from mycelium heat
shocked for 2 hours, while Cat-3 (Mw, 340,000; pI 5.5)
was predominant catalase in extracts derived from
mature conidia.
Conclusion
It may be concluded from all above discussion, the
culturing of
Sordaria fimicola
should be promoted to
produce higher amounts of enzymes and enhancing
biotechnology applications of fungi.
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