NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 13 of 1268
Selective adsorption of L- and D-amino acids on calcite: Implications for biochemical homochirality
External Online Source: doi:10.1073/pnas.101085998
Author and Affiliation:
Hazen, R. M.(NASA, Washington DC United States)
Filley, T. R.
Goodfriend, G. A.
Abstract: The emergence of biochemical homochirality was a key step in the origin of life, yet prebiotic mechanisms for chiral separation are not well constrained. Here we demonstrate a geochemically plausible scenario for chiral separation of amino acids by adsorption on mineral surfaces. Crystals of the common rock-forming mineral calcite (CaCO(3)), when immersed in a racemic aspartic acid solution, display significant adsorption and chiral selectivity of d- and l-enantiomers on pairs of mirror-related crystal-growth surfaces. This selective adsorption is greater on crystals with terraced surface textures, which indicates that d- and l-aspartic acid concentrate along step-like linear growth features. Thus, selective adsorption of linear arrays of d- and l-amino acids on calcite, with subsequent condensation polymerization, represents a plausible geochemical mechanism for the production of homochiral polypeptides on the prebiotic Earth.
Publication Date: May 08, 2001
Document ID:
20040125138
(Acquired Oct 12, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Proceedings of the National Academy of Sciences of the United States of America (ISSN 0027-8424); Volume 98; 10; 5487-90
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ADSORPTION; AMINO ACIDS; BIOCHEMISTRY; CALCIUM CARBONATES; ISOMERS
Other Descriptors: AMINO ACIDS/METABOLISM; CALCIUM CARBONATE/METABOLISM; ADSORPTION; STEREOISOMERISM; SUPPORT, NON-U.S. GOV'T
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 23, 2011
Contact Us