Isolation of DNA: The presumptive
actinomycetes cultures were grown in
Kusters broth for 7 days and about 2 mL of
the culture was centrifuged at 10,000 rpm for
2 min. The mycelia pellet was resuspended in
500 μL of 5M sodium chloride (NaCl). The
cells were centrifuged at 10,000 rpm for
30 sec and the pellet was resuspended with
500 μL of TE- Tris-EDTA buffer (10mM
Tris HCl and 1mM EDTA- pH 7.5)
containing 20 mg of lysozyme/mL and 20mg
of RNase/mL. The culture was sonicated for
2 min, 6 cycles. Then the tube was incubated
at 37°C for l hour. Following incubation, 250
μL of 0.5M Ethylenediaminetetraacetic acid,
250 μL TE containing 5mg of proteinase
K/mL, and 100 μL of Sodium dodecyl
sulphate were added to each tube and was
incubated at 37°C for l hour. The tubes were
mixed by inversion after the addition of 250
μL of 5M NaCl. Immediately about 200 μL
of cetyl trimethyl ammonium bromide
(CTAB) solution (10% CTAB and 0.7M
NaCl) was added, and the tubes were heated
in water bath at 65°C for 10 min. Cellular
debris was removed by centrifugation at 8000
rpm for 5 min, and the supernatant was
transferred to a fresh centrifuge tube. Protein
and lipids were removed by the addition of
0.3 volumes of phenol:chloroform and the
phases were mixed by inversion and
centrifuged at 12,000 rpm fro 5 min. Then the
aqueous phase