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Small Molecule Interactions Were Central To The Origin Of Life

Date:
May 17, 2006
Source:
University of Chicago Press Journals
Summary:
An important new paper argues against the widely held theory that the origin of life began with the spontaneous appearance of a large, replicating molecule such as RNA. Instead, Robert Shapiro (NYU) raises an alternative that does not depend on a "stupendously improbable accident," presenting the more plausible idea that life began within a mixture of simple organic molecules, multiplied through catalyzed reaction cycles and an external source of available energy.

In an important new paper forthcoming in the June issue of The Quarterly Review of Biology, Robert Shapiro (New York University) argues against the widely held theory that the origin of life began with the spontaneous appearance of a large, replicating molecule such as RNA. Instead, Shapiro raises an alternative that does not depend on a "stupendously improbable accident," presenting the more plausible idea that life began within a mixture of simple organic molecules, multiplied through catalyzed reaction cycles and an external source of available energy.

"The diversity of organic chemistry, with its harvest of competing, interconnected reactions, becomes an asset rather than a liability in the case of the energy-driven system," explains Shapiro. "The existence of side reaction paths can provide the network with the capacity of reacting to circumstances."

Shapiro outlines how replicator theories, though they have been supported by "prebiotic" syntheses carried out by chemists using modern apparatus and purified reagents, are highly unlikely. The creation of a molecule that can self-replicate requires the combination of diverse chemicals in a long sequence of reactions in a specific order, interspersed by complicated separations, purifications, and changes in locale.

Instead, Shapiro introduces the idea of a "driver" reaction, linked to a free energy source, that helps convert an unorganized mixture into a organized, self-regulated metabolic network.

"If we wish a more plausible origin of life, then we must work with the assumption that life began, somehow, among one of the mixtures of simple organic molecules that are produced by abiotic processes," writes Shapiro. "Nature will be instructing us, rather than we attempting to impose our schemes onto it."

Reference: Robert Shapiro "Small Molecule Interactions Were Central to the Origin of Life." The Quarterly Review of Biology, June 2006.


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The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


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University of Chicago Press Journals. "Small Molecule Interactions Were Central To The Origin Of Life." ScienceDaily. ScienceDaily, 17 May 2006. <www.sciencedaily.com/releases/2006/05/060517001538.htm>.
University of Chicago Press Journals. (2006, May 17). Small Molecule Interactions Were Central To The Origin Of Life. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2006/05/060517001538.htm
University of Chicago Press Journals. "Small Molecule Interactions Were Central To The Origin Of Life." ScienceDaily. www.sciencedaily.com/releases/2006/05/060517001538.htm (accessed September 2, 2014).

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