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Fungal Peptaibiotics : Assessing Potential Meteoritic Amino Acid Contamination

Author:
Callahan, M. P.
Published:
July 25, 2010.
Physical Description:
1 electronic document
Additional Creators:
Dworkin, J. P., Glavin, D. P., Elsila, J. E., and Bruckner, H.
Online Version

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Summary:
The presence of non-protein alpha-dialkyl-amino acids such as alpha-aminoisobutyric acid (alpha-A1B) and isovaline (Iva), which are relatively rare in the terrestrial biosphere, has long been used as an indication of the indigeneity of meteoritic amino acids, however, the discovery of alpha-AIB in peptides producers by a widespread group of filamentous fungi indicates the possibility of a terrestrial biotic source for the alpha-AIB observed in some meteorites. The alpha-AIB-containing peptides produced by these fungi are dubbed peptaibiotics. We measured the molecular distribution and stable carbon and nitrogen isotopic ratios for amino acids found in the total hydrolysates of four biologically synthesized peptaibiotics. We compared these aneasurenetts with those from the CM2 carbonaceous chondrite Murchison and from three Antarctic CR2 carbonaceous chondrites in order to understand the peptaibiotics as a potential source of meteoritic contamination.
Other Subject(s):
Collection:
NASA Technical Reports Server (NTRS) Collection.
Note:
Document ID: 20100031174.
73th Annual Meteoritical Society Meeting; 26-30 Jul. 2010; New York, NY; United States.
Terms of Use and Reproduction:
Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15994504