Compounds made from 'digested' molecules feeds appetite for greener pharmaceuticals and agrochemicals
Date:
February 1, 2022
Source:
University of Warwick
Summary:
A method of producing vital chemical building blocks for use in
the pharmaceutical and agrochemical industries mimics how plants
manufacture them.
FULL STORY ==========================================================================
A method of producing vital chemical building blocks for use in the pharmaceutical and agrochemical industries that mimics how plants
manufacture them has been developed by University of Warwick scientists.
========================================================================== Using enzymes in the same way that plants do, the scientists have created bacteria that 'digest' molecules to synthesise new compounds in a process
that is reusable and produces minimal waste products. Their results are published in a new study in the journal ACS Catalysis and could help the pharmaceutical and agrochemical industries in making their manufacturing process more environmentally friendly.
The scientists were particularly interested in reproducing a process
in plants called the indole-3-acetamide (IAM) pathway, that allows the
plant to produce compounds such as indolic amides, carboxylic acids and
auxins. These compounds have a number of agrochemical and pharmaceutical applications but are difficult for industry to manufacture except by
using chemical catalysts, which produce a lot of toxic chemical waste.
While scientists have been aware of how nature produces these molecules
for decades, until now the technology did not exist that could take
advantage of it. Now for the first time, a team based at the Warwick Integrative Synthetic Biology Centre has developed a process that uses
enzymes in a series of cascade reactions to break down molecules and
synthesise them into the required compounds, in the same way a plant
would.
The study, funded by UK Research and Innovation and the Royal Society,
was led by Dr Binuraj Menon at the University of Warwick School of Life Sciences, now based at the University of Portsmouth. He said: "We knew
that multiple pathways to Auxin molecules exist in plants. Also, some
plant pathogenic bacteria utilize these routes to infect and grow in plant roots and galls. However, reconstructing it in an industrial and friendly microbial host always we have encountered several functional issues.
"By engineering these enzymes, we can adapt the process for the purpose
of large-scale production, making it easily accessible, purifiable
and compatible.
The advantage here is the applicability of these enzymes, as the existing enzymatic solutions to make amide and carboxylic acid are challenging,
time consuming and require many expensive components Enzymes serve a
variety of purposes in living organisms and are often best known for
forming part of the human digestive system by breaking down food.
They are involved in many other functions as biocatalysts, in accelerating chemical reactions. Enzymes are being investigated as alternatives to
current chemical methods, cutting industrial emissions and resources,
an ideal solution for moving towards greener and environmentally friendly industrial production.
To produce the enzymes for this study, the scientists used non-pathogenic bacteria that were engineered to overexpress them. These enzymes can be separated for reactions in mild and aqueous conditions or the bacteria
can be directly used for reactions.
The bacterial cells reproduce quickly and chemicals are produced from
cheaper components like glucose, making it easily scaled up and reused
with little waste or environmental impact as is often encountered in
chemical catalysts. By redesigning microbes and enzymes, they can be
engineered to have new abilities and applications.
Dr Menon added: "We are basically harnessing the power of nature to
solve many problems in the chemical, pharmaceutical, agriculture and manufacturing industries via engineering microbes and enzymes. Synthetic Biology is essentially using biology for synthetic purposes, and here
we have displayed how blending and mixing it with different enzymes can
be used with many similar molecules.
"In the near future, additional engineering and lab-based evolution of
these enzymes will allow us to prepare bespoke molecules and targeted chemicals. The engineered bacteria could also be used to coat seeds
for healthy germination and root development, or as a weed killer by
tuning the auxins, with many direct applications and possibilities." ========================================================================== Story Source: Materials provided by University_of_Warwick. Note: Content
may be edited for style and length.
========================================================================== Journal Reference:
1. Navya Menon, Daniel Richmond, Mohammad Rejaur Rahman, Binuraj R. K.
Menon. Versatile and Facile One-Pot Biosynthesis for Amides and
Carboxylic Acids in E. coli by Engineering Auxin Pathways of Plant
Microbiomes. ACS Catalysis, 2022; 2309 DOI: 10.1021/acscatal.1c04901 ==========================================================================
Link to news story:
https://www.sciencedaily.com/releases/2022/02/220201115200.htm
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