Dear @Ting Chung Chau,
There are several methods for degrading the cell wall of gram + bacteria.
Their suitability depends on what you want to extract for sequencing and the medium in which the bacteria are.
Mind that you need to choose a Extraction Buffer accordingly.
There are also kits commercially available.
Many methods include using combinations of SDS, CTAB, proteinase K, lysozyme, antibiotic (i.e. ampicillin) and mechanical disruption (i.e. sonication and bead-vortexing).
Chapter DNA Extraction from Bacterial Cultures
The multiple manipulations lessen the quality of the extract, in particular the leftover SDS inhibits DNA analysis.
Cutting-edge methods are:
Phenol:Chloroform: phenol lyses and the supernatant is extracted with chloroform
Article Extremely Rapid Extraction of DNA from Bacteria and Yeasts
Electrochemical Cell Lysis (ECL): local generation of hydroxide at a cathode surface.
Article Electrochemical cell lysis of gram-positive and gram-negativ...
Carbonate silicate (carborundum): the particles are added to the liquid culture, which is shaken to induce their clashing.
Article A fast DNA extraction method for bacteria
Benzyl chloride: it reacts with -OH residues in polysaccharides and extracts
proteins and other cell debris from the aqueous phase.
Article Isolation of genomic DNAs from plants and bacteria using ben...
I used a Qiagen kit and followed the adaptation for gram+ bacteria.
For molecular analysis, DNA was extracted from isolated
colonies by alkaline lysis. One colony was suspended in an
Eppendorf tube with 50 μl of lysis buffer (2.5 ml 10 %
sodium dodecyl sulfate, 5 ml 1 M NaOH, and 92.5 ml
Milli-Q water). After 15 min at 95 °C, the tube was centrifuged
for 5 min at 13,000×g and the supernatant was transferred
to a new tube and diluted with 90 μl Milli-Q water.
Extracted DNAs were stored at −20 °C for further molecular
analyses.
Rahman et al. 2014. Biol. Fertil. Soils 50, 25-35. https://doi.org/10.1007/s00374-013-0828-0
You can lyse open the bacteria with 2-3 rounds of freezing and thawing and then use any standard nucleic acid extraction kit.
check the DNA extraction from https://www.ammagenomics.com/dna-rna-kits/
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