Study finds 'missing evolutionary link' of a widely used natural drug source

Study finds ‘missing evolutionary link’ of a widely used natural drug source
Authors of the new paper include (left to right) Ben Shen, Jeffrey Rudolf and Liao-Bin Dong. Credit: The Scripps Research Institute.

A well-known family of natural compounds, called "terpenoids," have a curious evolutionary origin. In particular, one question relevant to future drug discovery has puzzled scientists: exactly how does Nature make these molecules?

A study from scientists on the Florida campus of The Scripps Research Institute (TSRI) has now filled in a missing piece of the evolutionary puzzle, determining a previously unknown structure of a family of proteins that are key to making these compounds.

Terpenoids, mostly produced by plants, are a family of molecules that encompass some of the most well-known and successful drugs derived from natural sources, for example the cancer treatment Taxol. In total, there are more than 65,000 known .

Natural compounds, such as terpenoids, are typically made by numerous enzymes that stitch the parts together, like building a model from Lego. In the new study, the team focused on enzymes known as terpene synthases, which are found in both plants and bacteria.

The study, led by TSRI Professor Ben Shen, was recently published online ahead of print by the Journal of the American Chemical Society. In addition to the advance in the structural biology of this class of proteins, the new findings could also affect drug discovery, making engineering of these proteins, and thus the compounds they make, easier in the future.

Using x-ray crystallography—freezing the atomic structure of a protein, then bombarding it with x-rays to create a snapshot of it—Shen and his colleagues developed a detailed structural model that provides a far better understanding of bacterial diterpene synthases and how this class of enzymes work in a natural setting.

"What we found out is that the bacterial version is structurally very similar to the plant version and may support the idea of a gene fusion event that created the bifunctional plant enzymes," said TSRI Research Associate Jeffrey Rudolf, a co-first author of the paper with TSRI Research Associate Liao-Bin Dong. "We were also able to map which parts of the enzyme are important, giving us an idea of how to engineer the protein for structural diversity."

Dong added, "This new information not only allows us to engineer structural diversity into both bacterial and plant terpenoids, it also helps us identify new diterpenoids of bacterial origin, which are rare and could lead to exciting new with interesting biological activities."

In addition to Shen, Rudolf and Dong, other authors of the study include Hongnan Cao and George N. Phillips of Rice University; Catherine Hatzos-Skintges, Jerzy Osipiuk, Michael Endres, Gyorgy Babnigg and Andrzej Joachimiak of Argonne National Laboratory; Chin-Yuan Chang and Ming Ma of TSRI.


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More information: Jeffrey D. Rudolf et al. Structure of the-Copalyl Diphosphate Synthase PtmT2 fromCB00739, a Bacterial Type II Diterpene Synthase, Journal of the American Chemical Society (2016). DOI: 10.1021/jacs.6b04317
Citation: Study finds 'missing evolutionary link' of a widely used natural drug source (2016, August 19) retrieved 25 August 2019 from https://phys.org/news/2016-08-evolutionary-link-widely-natural-drug.html
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Aug 19, 2016
There is certainly something about evolution in the article. RTFA [Read The Fetid Abstract]:

"Type II DTSs [diterpene synthases] of bacterial origin, of which there are no structurally characterized members, are a missing piece in the structural evolution of TSs [terpenoid sythases]."

It's not Evolution, (your bogey-man, your nemesis, your hated enemy); but evolution, as in the creation of a specified product by a chemical pathway.

Farewell, BartV. You're now an "ignored user".

Aug 22, 2016
terpenoids, are typically made by numerous enzymes that stitch the parts together

Enzymes working on constituent parts are the bane of evolutionary thought - you need them to make proteins and other compounds yet they themselves are already part of the make-up - as proteins themselves. So where did the first proteins come from?

In any case,
It's not Evolution, (your bogey-man, your nemesis, your hated enemy); but evolution, as in the creation of a specified product by a chemical pathway.

Whats the difference between Evolution and evolution? It's the same old equivocation - using the term in one context but implying the overall Darwinian, one ancestor makes all kind of thing. Then claiming that idiots who disagree cannot understand it.
Besides which, if something is specified then it implies instructions of some kind. But there's no such thing in evolution so the quoted statement is meaningless.

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