Origens da Vida: Thermophiles como LUCA?

Na FAME ( Foundation for Applied Molecular Evolution) le-se o seguinte a respeito das origens da Vida:

The Early History of Life

The Temperature History of Life

Features of the physical environment surrounding an ancestral organism can be inferred by reconstructing sequences of ancient proteins made by those organisms, resurrecting these proteins in the laboratory, and measuring their properties. Our studies suggest that the ancestors of modern life were thermophiles (heat-loving). (NASA)




From Wikipedia, the free encyclopedia

Thermophiles produce some of the bright colors of Grand Prismatic SpringYellowstone National Park

thermophile is an organism — a type of extremophile — that thrives at relatively high temperatures, between 45 and 122 °C (113 and 252 °F).[1][2] Many thermophiles are archaea. Thermophilic eubacteria are suggested to have been among the earliest bacteria.[3]

Thermophiles are found in various geothermally heated regions of the Earth, such as hot springs like those in Yellowstone National Park(see image) and deep sea hydrothermal vents, as well as decaying plant matter, such as peat bogs and compost.

Unlike other types of bacteria, thermophiles can survive at much hotter temperatures, where as other bacteria would be damaged and sometimes killed if exposed to the same temperatures.

As a prerequisite for their survival, thermophiles contain enzymes that can function at high temperatures. Some of these enzymes are used in molecular biology (for example, heat-stable DNA polymerases for PCR), and in washing agents.

A scientific conference for those who study thermophiles has been held since 1990 at locations throughout the world, including Viterbo, Italy; Reykjavik, Iceland; New Delhi, India; and Bergen, Norway. The 2011 edition was held in Big Sky, Montana, USA, and hosted byBozeman Campus, Montana State University.[4]

Tags: , , , ,