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Record Details

Record 67 of 3307
Energetics of amino acid synthesis in hydrothermal ecosystems
External Online Source: doi:10.1126/science.281.5383.1659
Author and Affiliation:
Amend, J. P.(Washington University, Group Exploring Organic Processes in Geochemistry (GEOPIG), Department of Earth and Planetary Sciences, St. Louis, MO 63130, United States)
Shock, E. L.
Abstract: Thermodynamic calculations showed that the autotrophic synthesis of all 20 protein-forming amino acids was energetically favored in hot (100 degrees C), moderately reduced, submarine hydrothermal solutions relative to the synthesis in cold (18 degrees C), oxidized, surface seawater. The net synthesis reactions of 11 amino acids were exergonic in the hydrothermal solution, but all were endergonic in surface seawater. The synthesis of the requisite amino acids of nine thermophilic and hyperthermophilic proteins in a 100 degreesC hydrothermal solution yielded between 600 and 8000 kilojoules per mole of protein, which is energy that is available to drive the intracellular synthesis of enzymes and other biopolymers in hyperthermophiles thriving in these ecosystems.
Publication Date: Sep 11, 1998
Document ID:
20040172574
(Acquired Dec 09, 2004)
Subject Category: EXOBIOLOGY
Document Type: Journal Article
Publication Information: Science (ISSN 0036-8075); Volume 281; 5383; 1659-62
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AMINO ACIDS; ARCHAEBACTERIA; BACTERIA; ECOSYSTEMS; HEAT; ABIOGENESIS; CHEMICAL EVOLUTION; EXOBIOLOGY; OXIDATION-REDUCTION REACTIONS; PROTEINS; SEA WATER; THERMODYNAMICS
Other Descriptors: AMINO ACIDS/BIOSYNTHESIS; ARCHAEA/METABOLISM; BACTERIA/METABOLISM; ECOSYSTEM; HEAT; BIOGENESIS; OXIDATION-REDUCTION; PROTEINS/BIOSYNTHESIS; SEAWATER/MICROBIOLOGY; SUPPORT, U.S. GOV'T, NON-P.H.S; THERMODYNAMICS; NASA DISCIPLINE EXOBIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
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