plastic degrading bacteria isolated
Pet), or PET —
A team of Japanese researchers has been identified.
The bacteria used two enzymes in turn to decompose highly biodegradable-
Results announced on Friday (March 11)
In the journal Science.
In addition to the rare cases where two fungi are found to grow on the mineral medium of PET Yarn, there is no report of any bacterial biodegradable PET or growth on chemical inert substances.
Yoshida Shosuke, the first author of a paper on applied biology at Kyoto Institute of Technology, collected 250 pieces
Collect samples of site contamination from PET bottles.
They look for microorganisms that rely on PET films as the primary source of carbon growth.
At first, they found a unique microbial community containing a mixture of bacterial species that degrade the surface of PET Films at 30 °c;
75 of the surface of the PET film is decomposed into carbon dioxide at 28 °c.
The researchers isolated a unique bacteria from the microbial population.
Ideonella sakaiensis 201-F6 —
This can completely degrade PET Films in almost six weeks at 30 °c.
\"The PET film was extensively damaged after six weeks at 30 °c and almost completely degraded,\" they noted . \".
The bacteria degrade PET using two enzymes acting in turn on PET.
First, the bacteria attach to the PET and produce an intermediate substance by hydrolysis.
Then, the second enzyme works with water, acting on this intermediate substance and producing two monomer --
Ethylene glycol and bisic acid-
Used to make PET by polymerization. Human-
In the past 70 years, artificial pets have been destroying the environment. in 2013, 56 million tons of pets were produced worldwide.
Since the emergence of pets 70 years ago, a related question is how this unique bacteria evolved or naturally selected in the environment.
In addition, it is not clear what natural processes these two unique enzymes play during evolution, and they are able to break down PET in sequence.
\"PET enrichment in sampling points and enrichment cultures may facilitate the selection of bacteria that may have obtained the necessary gene sets through lateral gene transfer,\" they wrote . \".
\"In a relatively short period of time, have both of these enzymes evolved to enable bacteria to obtain new carbon sources, thus providing an advantage for survival?
There are very few examples of this rapid natural evolution, \"said Uwe T.
Bornscheuer of the Institute of Biochemistry, University of Greifswald, Germany, said in an accompanying opinion article.